move libs/utils to libutils

Change-Id: I6cf4268599460791414882f91eeb88a992fbd29d

10 files changed, 2447 insertions, 0 deletions

diff --git a/libutils/tests/Android.mk b/libutils/tests/Android.mk
new file mode 100644
index 0000000..caedaff
--- /dev/null
+++ b/libutils/tests/Android.mk
@@ -0,0 +1,34 @@
+# Build the unit tests.
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+# Build the unit tests.
+test_src_files := \
+    BasicHashtable_test.cpp \
+    BlobCache_test.cpp \
+    BitSet_test.cpp \
+    Looper_test.cpp \
+    LruCache_test.cpp \
+    String8_test.cpp \
+    Unicode_test.cpp \
+    Vector_test.cpp
+
+shared_libraries := \
+    libz \
+    liblog \
+    libcutils \
+    libutils \
+    libstlport
+
+static_libraries := \
+    libgtest \
+    libgtest_main
+
+$(foreach file,$(test_src_files), \
+    $(eval include $(CLEAR_VARS)) \
+    $(eval LOCAL_SHARED_LIBRARIES := $(shared_libraries)) \
+    $(eval LOCAL_STATIC_LIBRARIES := $(static_libraries)) \
+    $(eval LOCAL_SRC_FILES := $(file)) \
+    $(eval LOCAL_MODULE := $(notdir $(file:%.cpp=%))) \
+    $(eval include $(BUILD_NATIVE_TEST)) \
+)
diff --git a/libutils/tests/BasicHashtable_test.cpp b/libutils/tests/BasicHashtable_test.cpp
new file mode 100644
index 0000000..7dcf750
--- /dev/null
+++ b/libutils/tests/BasicHashtable_test.cpp
@@ -0,0 +1,577 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BasicHashtable_test"
+
+#include <utils/BasicHashtable.h>
+#include <cutils/log.h>
+#include <gtest/gtest.h>
+#include <unistd.h>
+
+namespace android {
+
+typedef int SimpleKey;
+typedef int SimpleValue;
+typedef key_value_pair_t<SimpleKey, SimpleValue> SimpleEntry;
+typedef BasicHashtable<SimpleKey, SimpleEntry> SimpleHashtable;
+
+struct ComplexKey {
+    int k;
+
+    explicit ComplexKey(int k) : k(k) {
+        instanceCount += 1;
+    }
+
+    ComplexKey(const ComplexKey& other) : k(other.k) {
+        instanceCount += 1;
+    }
+
+    ~ComplexKey() {
+        instanceCount -= 1;
+    }
+
+    bool operator ==(const ComplexKey& other) const {
+        return k == other.k;
+    }
+
+    bool operator !=(const ComplexKey& other) const {
+        return k != other.k;
+    }
+
+    static ssize_t instanceCount;
+};
+
+ssize_t ComplexKey::instanceCount = 0;
+
+template<> inline hash_t hash_type(const ComplexKey& value) {
+    return hash_type(value.k);
+}
+
+struct ComplexValue {
+    int v;
+
+    explicit ComplexValue(int v) : v(v) {
+        instanceCount += 1;
+    }
+
+    ComplexValue(const ComplexValue& other) : v(other.v) {
+        instanceCount += 1;
+    }
+
+    ~ComplexValue() {
+        instanceCount -= 1;
+    }
+
+    static ssize_t instanceCount;
+};
+
+ssize_t ComplexValue::instanceCount = 0;
+
+typedef key_value_pair_t<ComplexKey, ComplexValue> ComplexEntry;
+typedef BasicHashtable<ComplexKey, ComplexEntry> ComplexHashtable;
+
+class BasicHashtableTest : public testing::Test {
+protected:
+    virtual void SetUp() {
+        ComplexKey::instanceCount = 0;
+        ComplexValue::instanceCount = 0;
+    }
+
+    virtual void TearDown() {
+        ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+    }
+
+    void assertInstanceCount(ssize_t keys, ssize_t values) {
+        if (keys != ComplexKey::instanceCount || values != ComplexValue::instanceCount) {
+            FAIL() << "Expected " << keys << " keys and " << values << " values "
+                    "but there were actually " << ComplexKey::instanceCount << " keys and "
+                    << ComplexValue::instanceCount << " values";
+        }
+    }
+
+public:
+    template <typename TKey, typename TEntry>
+    static void cookieAt(const BasicHashtable<TKey, TEntry>& h, size_t index,
+            bool* collision, bool* present, hash_t* hash) {
+        uint32_t cookie = h.cookieAt(index);
+        *collision = cookie & BasicHashtable<TKey, TEntry>::Bucket::COLLISION;
+        *present = cookie & BasicHashtable<TKey, TEntry>::Bucket::PRESENT;
+        *hash = cookie & BasicHashtable<TKey, TEntry>::Bucket::HASH_MASK;
+    }
+
+    template <typename TKey, typename TEntry>
+    static const void* getBuckets(const BasicHashtable<TKey, TEntry>& h) {
+        return h.mBuckets;
+    }
+};
+
+template <typename TKey, typename TValue>
+static size_t add(BasicHashtable<TKey, key_value_pair_t<TKey, TValue> >& h,
+        const TKey& key, const TValue& value) {
+    return h.add(hash_type(key), key_value_pair_t<TKey, TValue>(key, value));
+}
+
+template <typename TKey, typename TValue>
+static ssize_t find(BasicHashtable<TKey, key_value_pair_t<TKey, TValue> >& h,
+        ssize_t index, const TKey& key) {
+    return h.find(index, hash_type(key), key);
+}
+
+template <typename TKey, typename TValue>
+static bool remove(BasicHashtable<TKey, key_value_pair_t<TKey, TValue> >& h,
+        const TKey& key) {
+    ssize_t index = find(h, -1, key);
+    if (index >= 0) {
+        h.removeAt(index);
+        return true;
+    }
+    return false;
+}
+
+template <typename TEntry>
+static void getKeyValue(const TEntry& entry, int* key, int* value);
+
+template <> void getKeyValue(const SimpleEntry& entry, int* key, int* value) {
+    *key = entry.key;
+    *value = entry.value;
+}
+
+template <> void getKeyValue(const ComplexEntry& entry, int* key, int* value) {
+    *key = entry.key.k;
+    *value = entry.value.v;
+}
+
+template <typename TKey, typename TValue>
+static void dump(BasicHashtable<TKey, key_value_pair_t<TKey, TValue> >& h) {
+    ALOGD("hashtable %p, size=%u, capacity=%u, bucketCount=%u",
+            &h, h.size(), h.capacity(), h.bucketCount());
+    for (size_t i = 0; i < h.bucketCount(); i++) {
+        bool collision, present;
+        hash_t hash;
+        BasicHashtableTest::cookieAt(h, i, &collision, &present, &hash);
+        if (present) {
+            int key, value;
+            getKeyValue(h.entryAt(i), &key, &value);
+            ALOGD("  [%3u] = collision=%d, present=%d, hash=0x%08x, key=%3d, value=%3d, "
+                    "hash_type(key)=0x%08x",
+                    i, collision, present, hash, key, value, hash_type(key));
+        } else {
+            ALOGD("  [%3u] = collision=%d, present=%d",
+                    i, collision, present);
+        }
+    }
+}
+
+TEST_F(BasicHashtableTest, DefaultConstructor_WithDefaultProperties) {
+    SimpleHashtable h;
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Constructor_WithNonUnityLoadFactor) {
+    SimpleHashtable h(52, 0.8f);
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(77U, h.capacity());
+    EXPECT_EQ(97U, h.bucketCount());
+    EXPECT_EQ(0.8f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Constructor_WithUnityLoadFactorAndExactCapacity) {
+    SimpleHashtable h(46, 1.0f);
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(46U, h.capacity()); // must be one less than bucketCount because loadFactor == 1.0f
+    EXPECT_EQ(47U, h.bucketCount());
+    EXPECT_EQ(1.0f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Constructor_WithUnityLoadFactorAndInexactCapacity) {
+    SimpleHashtable h(42, 1.0f);
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(46U, h.capacity()); // must be one less than bucketCount because loadFactor == 1.0f
+    EXPECT_EQ(47U, h.bucketCount());
+    EXPECT_EQ(1.0f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, FindAddFindRemoveFind_OneEntry) {
+    SimpleHashtable h;
+    ssize_t index = find(h, -1, 8);
+    ASSERT_EQ(-1, index);
+
+    index = add(h, 8, 1);
+    ASSERT_EQ(1U, h.size());
+
+    ASSERT_EQ(index, find(h, -1, 8));
+    ASSERT_EQ(8, h.entryAt(index).key);
+    ASSERT_EQ(1, h.entryAt(index).value);
+
+    index = find(h, index, 8);
+    ASSERT_EQ(-1, index);
+
+    ASSERT_TRUE(remove(h, 8));
+    ASSERT_EQ(0U, h.size());
+
+    index = find(h, -1, 8);
+    ASSERT_EQ(-1, index);
+}
+
+TEST_F(BasicHashtableTest, FindAddFindRemoveFind_MultipleEntryWithUniqueKey) {
+    const size_t N = 11;
+
+    SimpleHashtable h;
+    for (size_t i = 0; i < N; i++) {
+        ssize_t index = find(h, -1, int(i));
+        ASSERT_EQ(-1, index);
+
+        index = add(h, int(i), int(i * 10));
+        ASSERT_EQ(i + 1, h.size());
+
+        ASSERT_EQ(index, find(h, -1, int(i)));
+        ASSERT_EQ(int(i), h.entryAt(index).key);
+        ASSERT_EQ(int(i * 10), h.entryAt(index).value);
+
+        index = find(h, index, int(i));
+        ASSERT_EQ(-1, index);
+    }
+
+    for (size_t i = N; --i > 0; ) {
+        ASSERT_TRUE(remove(h, int(i))) << "i = " << i;
+        ASSERT_EQ(i, h.size());
+
+        ssize_t index = find(h, -1, int(i));
+        ASSERT_EQ(-1, index);
+    }
+}
+
+TEST_F(BasicHashtableTest, FindAddFindRemoveFind_MultipleEntryWithDuplicateKey) {
+    const size_t N = 11;
+    const int K = 1;
+
+    SimpleHashtable h;
+    for (size_t i = 0; i < N; i++) {
+        ssize_t index = find(h, -1, K);
+        if (i == 0) {
+            ASSERT_EQ(-1, index);
+        } else {
+            ASSERT_NE(-1, index);
+        }
+
+        add(h, K, int(i));
+        ASSERT_EQ(i + 1, h.size());
+
+        index = -1;
+        int values = 0;
+        for (size_t j = 0; j <= i; j++) {
+            index = find(h, index, K);
+            ASSERT_GE(index, 0);
+            ASSERT_EQ(K, h.entryAt(index).key);
+            values |= 1 << h.entryAt(index).value;
+        }
+        ASSERT_EQ(values, (1 << (i + 1)) - 1);
+
+        index = find(h, index, K);
+        ASSERT_EQ(-1, index);
+    }
+
+    for (size_t i = N; --i > 0; ) {
+        ASSERT_TRUE(remove(h, K)) << "i = " << i;
+        ASSERT_EQ(i, h.size());
+
+        ssize_t index = -1;
+        for (size_t j = 0; j < i; j++) {
+            index = find(h, index, K);
+            ASSERT_GE(index, 0);
+            ASSERT_EQ(K, h.entryAt(index).key);
+        }
+
+        index = find(h, index, K);
+        ASSERT_EQ(-1, index);
+    }
+}
+
+TEST_F(BasicHashtableTest, Clear_WhenAlreadyEmpty_DoesNothing) {
+    SimpleHashtable h;
+    h.clear();
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Clear_AfterElementsAdded_RemovesThem) {
+    SimpleHashtable h;
+    add(h, 0, 0);
+    add(h, 1, 0);
+    h.clear();
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Clear_AfterElementsAdded_DestroysThem) {
+    ComplexHashtable h;
+    add(h, ComplexKey(0), ComplexValue(0));
+    add(h, ComplexKey(1), ComplexValue(0));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+
+    h.clear();
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Remove_AfterElementsAdded_DestroysThem) {
+    ComplexHashtable h;
+    add(h, ComplexKey(0), ComplexValue(0));
+    add(h, ComplexKey(1), ComplexValue(0));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+
+    ASSERT_TRUE(remove(h, ComplexKey(0)));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(1, 1));
+
+    ASSERT_TRUE(remove(h, ComplexKey(1)));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+}
+
+TEST_F(BasicHashtableTest, Destructor_AfterElementsAdded_DestroysThem) {
+    {
+        ComplexHashtable h;
+        add(h, ComplexKey(0), ComplexValue(0));
+        add(h, ComplexKey(1), ComplexValue(0));
+        ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    } // h is destroyed here
+
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+}
+
+TEST_F(BasicHashtableTest, Next_WhenEmpty_ReturnsMinusOne) {
+    SimpleHashtable h;
+
+    ASSERT_EQ(-1, h.next(-1));
+}
+
+TEST_F(BasicHashtableTest, Next_WhenNonEmpty_IteratesOverAllEntries) {
+    const int N = 88;
+
+    SimpleHashtable h;
+    for (int i = 0; i < N; i++) {
+        add(h, i, i * 10);
+    }
+
+    bool set[N];
+    memset(set, 0, sizeof(bool) * N);
+    int count = 0;
+    for (ssize_t index = -1; (index = h.next(index)) != -1; ) {
+        ASSERT_GE(index, 0);
+        ASSERT_LT(size_t(index), h.bucketCount());
+
+        const SimpleEntry& entry = h.entryAt(index);
+        ASSERT_GE(entry.key, 0);
+        ASSERT_LT(entry.key, N);
+        ASSERT_EQ(false, set[entry.key]);
+        ASSERT_EQ(entry.key * 10, entry.value);
+
+        set[entry.key] = true;
+        count += 1;
+    }
+    ASSERT_EQ(N, count);
+}
+
+TEST_F(BasicHashtableTest, Add_RehashesOnDemand) {
+    SimpleHashtable h;
+    size_t initialCapacity = h.capacity();
+    size_t initialBucketCount = h.bucketCount();
+
+    for (size_t i = 0; i < initialCapacity; i++) {
+        add(h, int(i), 0);
+    }
+
+    EXPECT_EQ(initialCapacity, h.size());
+    EXPECT_EQ(initialCapacity, h.capacity());
+    EXPECT_EQ(initialBucketCount, h.bucketCount());
+
+    add(h, -1, -1);
+
+    EXPECT_EQ(initialCapacity + 1, h.size());
+    EXPECT_GT(h.capacity(), initialCapacity);
+    EXPECT_GT(h.bucketCount(), initialBucketCount);
+    EXPECT_GT(h.bucketCount(), h.capacity());
+}
+
+TEST_F(BasicHashtableTest, Rehash_WhenCapacityAndBucketCountUnchanged_DoesNothing) {
+    ComplexHashtable h;
+    add(h, ComplexKey(0), ComplexValue(0));
+    const void* oldBuckets = getBuckets(h);
+    ASSERT_NE((void*)NULL, oldBuckets);
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(1, 1));
+
+    h.rehash(h.capacity(), h.loadFactor());
+
+    ASSERT_EQ(oldBuckets, getBuckets(h));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(1, 1));
+}
+
+TEST_F(BasicHashtableTest, Rehash_WhenEmptyAndHasNoBuckets_ButDoesNotAllocateBuckets) {
+    ComplexHashtable h;
+    ASSERT_EQ((void*)NULL, getBuckets(h));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+
+    h.rehash(9, 1.0f);
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(10U, h.capacity());
+    EXPECT_EQ(11U, h.bucketCount());
+    EXPECT_EQ(1.0f, h.loadFactor());
+    EXPECT_EQ((void*)NULL, getBuckets(h));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+}
+
+TEST_F(BasicHashtableTest, Rehash_WhenEmptyAndHasBuckets_ReleasesBucketsAndSetsCapacity) {
+    ComplexHashtable h(10);
+    add(h, ComplexKey(0), ComplexValue(0));
+    ASSERT_TRUE(remove(h, ComplexKey(0)));
+    ASSERT_NE((void*)NULL, getBuckets(h));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+
+    h.rehash(0, 0.75f);
+
+    EXPECT_EQ(0U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+    EXPECT_EQ((void*)NULL, getBuckets(h));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+}
+
+TEST_F(BasicHashtableTest, Rehash_WhenLessThanCurrentCapacity_ShrinksBuckets) {
+    ComplexHashtable h(10);
+    add(h, ComplexKey(0), ComplexValue(0));
+    add(h, ComplexKey(1), ComplexValue(1));
+    const void* oldBuckets = getBuckets(h);
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+
+    h.rehash(0, 0.75f);
+
+    EXPECT_EQ(2U, h.size());
+    EXPECT_EQ(3U, h.capacity());
+    EXPECT_EQ(5U, h.bucketCount());
+    EXPECT_EQ(0.75f, h.loadFactor());
+    EXPECT_NE(oldBuckets, getBuckets(h));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+}
+
+TEST_F(BasicHashtableTest, CopyOnWrite) {
+    ComplexHashtable h1;
+    add(h1, ComplexKey(0), ComplexValue(0));
+    add(h1, ComplexKey(1), ComplexValue(1));
+    const void* originalBuckets = getBuckets(h1);
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    ssize_t index0 = find(h1, -1, ComplexKey(0));
+    EXPECT_GE(index0, 0);
+
+    // copy constructor acquires shared reference
+    ComplexHashtable h2(h1);
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    ASSERT_EQ(originalBuckets, getBuckets(h2));
+    EXPECT_EQ(h1.size(), h2.size());
+    EXPECT_EQ(h1.capacity(), h2.capacity());
+    EXPECT_EQ(h1.bucketCount(), h2.bucketCount());
+    EXPECT_EQ(h1.loadFactor(), h2.loadFactor());
+    EXPECT_EQ(index0, find(h2, -1, ComplexKey(0)));
+
+    // operator= acquires shared reference
+    ComplexHashtable h3;
+    h3 = h2;
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    ASSERT_EQ(originalBuckets, getBuckets(h3));
+    EXPECT_EQ(h1.size(), h3.size());
+    EXPECT_EQ(h1.capacity(), h3.capacity());
+    EXPECT_EQ(h1.bucketCount(), h3.bucketCount());
+    EXPECT_EQ(h1.loadFactor(), h3.loadFactor());
+    EXPECT_EQ(index0, find(h3, -1, ComplexKey(0)));
+
+    // editEntryAt copies shared contents
+    h1.editEntryAt(index0).value.v = 42;
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(4, 4));
+    ASSERT_NE(originalBuckets, getBuckets(h1));
+    EXPECT_EQ(42, h1.entryAt(index0).value.v);
+    EXPECT_EQ(0, h2.entryAt(index0).value.v);
+    EXPECT_EQ(0, h3.entryAt(index0).value.v);
+
+    // clear releases reference to shared contents
+    h2.clear();
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(4, 4));
+    EXPECT_EQ(0U, h2.size());
+    ASSERT_NE(originalBuckets, getBuckets(h2));
+
+    // operator= acquires shared reference, destroys unshared contents
+    h1 = h3;
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    ASSERT_EQ(originalBuckets, getBuckets(h1));
+    EXPECT_EQ(h3.size(), h1.size());
+    EXPECT_EQ(h3.capacity(), h1.capacity());
+    EXPECT_EQ(h3.bucketCount(), h1.bucketCount());
+    EXPECT_EQ(h3.loadFactor(), h1.loadFactor());
+    EXPECT_EQ(index0, find(h1, -1, ComplexKey(0)));
+
+    // add copies shared contents
+    add(h1, ComplexKey(2), ComplexValue(2));
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(5, 5));
+    ASSERT_NE(originalBuckets, getBuckets(h1));
+    EXPECT_EQ(3U, h1.size());
+    EXPECT_EQ(0U, h2.size());
+    EXPECT_EQ(2U, h3.size());
+
+    // remove copies shared contents
+    h1 = h3;
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    ASSERT_EQ(originalBuckets, getBuckets(h1));
+    h1.removeAt(index0);
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(3, 3));
+    ASSERT_NE(originalBuckets, getBuckets(h1));
+    EXPECT_EQ(1U, h1.size());
+    EXPECT_EQ(0U, h2.size());
+    EXPECT_EQ(2U, h3.size());
+
+    // rehash copies shared contents
+    h1 = h3;
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(2, 2));
+    ASSERT_EQ(originalBuckets, getBuckets(h1));
+    h1.rehash(10, 1.0f);
+    ASSERT_NO_FATAL_FAILURE(assertInstanceCount(4, 4));
+    ASSERT_NE(originalBuckets, getBuckets(h1));
+    EXPECT_EQ(2U, h1.size());
+    EXPECT_EQ(0U, h2.size());
+    EXPECT_EQ(2U, h3.size());
+}
+
+} // namespace android
diff --git a/libutils/tests/BitSet_test.cpp b/libutils/tests/BitSet_test.cpp
new file mode 100644
index 0000000..752e56d
--- /dev/null
+++ b/libutils/tests/BitSet_test.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BitSet_test"
+
+#include <utils/BitSet.h>
+#include <cutils/log.h>
+#include <gtest/gtest.h>
+#include <unistd.h>
+
+namespace android {
+
+class BitSetTest : public testing::Test {
+protected:
+    BitSet32 b1;
+    BitSet32 b2;
+    virtual void TearDown() {
+        b1.clear();
+        b2.clear();
+    }
+};
+
+
+TEST_F(BitSetTest, BitWiseOr) {
+    b1.markBit(2);
+    b2.markBit(4);
+
+    BitSet32 tmp = b1 | b2;
+    EXPECT_EQ(tmp.count(), 2u);
+    EXPECT_TRUE(tmp.hasBit(2) && tmp.hasBit(4));
+    // Check that the operator is symmetric
+    EXPECT_TRUE((b2 | b1) == (b1 | b2));
+
+    b1 |= b2;
+    EXPECT_EQ(b1.count(), 2u);
+    EXPECT_TRUE(b1.hasBit(2) && b1.hasBit(4));
+    EXPECT_TRUE(b2.hasBit(4) && b2.count() == 1u);
+}
+TEST_F(BitSetTest, BitWiseAnd_Disjoint) {
+    b1.markBit(2);
+    b1.markBit(4);
+    b1.markBit(6);
+
+    BitSet32 tmp = b1 & b2;
+    EXPECT_TRUE(tmp.isEmpty());
+    // Check that the operator is symmetric
+    EXPECT_TRUE((b2 & b1) == (b1 & b2));
+
+    b2 &= b1;
+    EXPECT_TRUE(b2.isEmpty());
+    EXPECT_EQ(b1.count(), 3u);
+    EXPECT_TRUE(b1.hasBit(2) && b1.hasBit(4) && b1.hasBit(6));
+}
+
+TEST_F(BitSetTest, BitWiseAnd_NonDisjoint) {
+    b1.markBit(2);
+    b1.markBit(4);
+    b1.markBit(6);
+    b2.markBit(3);
+    b2.markBit(6);
+    b2.markBit(9);
+
+    BitSet32 tmp = b1 & b2;
+    EXPECT_EQ(tmp.count(), 1u);
+    EXPECT_TRUE(tmp.hasBit(6));
+    // Check that the operator is symmetric
+    EXPECT_TRUE((b2 & b1) == (b1 & b2));
+
+    b1 &= b2;
+    EXPECT_EQ(b1.count(), 1u);
+    EXPECT_EQ(b2.count(), 3u);
+    EXPECT_TRUE(b2.hasBit(3) && b2.hasBit(6) && b2.hasBit(9));
+}
+} // namespace android
diff --git a/libutils/tests/BlobCache_test.cpp b/libutils/tests/BlobCache_test.cpp
new file mode 100644
index 0000000..7202123
--- /dev/null
+++ b/libutils/tests/BlobCache_test.cpp
@@ -0,0 +1,421 @@
+/*
+ ** Copyright 2011, The Android Open Source Project
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ **     http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+
+#include <gtest/gtest.h>
+
+#include <utils/BlobCache.h>
+#include <utils/Errors.h>
+
+namespace android {
+
+class BlobCacheTest : public ::testing::Test {
+protected:
+    enum {
+        MAX_KEY_SIZE = 6,
+        MAX_VALUE_SIZE = 8,
+        MAX_TOTAL_SIZE = 13,
+    };
+
+    virtual void SetUp() {
+        mBC = new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE);
+    }
+
+    virtual void TearDown() {
+        mBC.clear();
+    }
+
+    sp<BlobCache> mBC;
+};
+
+TEST_F(BlobCacheTest, CacheSingleValueSucceeds) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+    ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
+    ASSERT_EQ('e', buf[0]);
+    ASSERT_EQ('f', buf[1]);
+    ASSERT_EQ('g', buf[2]);
+    ASSERT_EQ('h', buf[3]);
+}
+
+TEST_F(BlobCacheTest, CacheTwoValuesSucceeds) {
+    char buf[2] = { 0xee, 0xee };
+    mBC->set("ab", 2, "cd", 2);
+    mBC->set("ef", 2, "gh", 2);
+    ASSERT_EQ(size_t(2), mBC->get("ab", 2, buf, 2));
+    ASSERT_EQ('c', buf[0]);
+    ASSERT_EQ('d', buf[1]);
+    ASSERT_EQ(size_t(2), mBC->get("ef", 2, buf, 2));
+    ASSERT_EQ('g', buf[0]);
+    ASSERT_EQ('h', buf[1]);
+}
+
+TEST_F(BlobCacheTest, GetOnlyWritesInsideBounds) {
+    char buf[6] = { 0xee, 0xee, 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+    ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf+1, 4));
+    ASSERT_EQ(0xee, buf[0]);
+    ASSERT_EQ('e', buf[1]);
+    ASSERT_EQ('f', buf[2]);
+    ASSERT_EQ('g', buf[3]);
+    ASSERT_EQ('h', buf[4]);
+    ASSERT_EQ(0xee, buf[5]);
+}
+
+TEST_F(BlobCacheTest, GetOnlyWritesIfBufferIsLargeEnough) {
+    char buf[3] = { 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+    ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 3));
+    ASSERT_EQ(0xee, buf[0]);
+    ASSERT_EQ(0xee, buf[1]);
+    ASSERT_EQ(0xee, buf[2]);
+}
+
+TEST_F(BlobCacheTest, GetDoesntAccessNullBuffer) {
+    mBC->set("abcd", 4, "efgh", 4);
+    ASSERT_EQ(size_t(4), mBC->get("abcd", 4, NULL, 0));
+}
+
+TEST_F(BlobCacheTest, MultipleSetsCacheLatestValue) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+    mBC->set("abcd", 4, "ijkl", 4);
+    ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
+    ASSERT_EQ('i', buf[0]);
+    ASSERT_EQ('j', buf[1]);
+    ASSERT_EQ('k', buf[2]);
+    ASSERT_EQ('l', buf[3]);
+}
+
+TEST_F(BlobCacheTest, SecondSetKeepsFirstValueIfTooLarge) {
+    char buf[MAX_VALUE_SIZE+1] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+    mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1);
+    ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4));
+    ASSERT_EQ('e', buf[0]);
+    ASSERT_EQ('f', buf[1]);
+    ASSERT_EQ('g', buf[2]);
+    ASSERT_EQ('h', buf[3]);
+}
+
+TEST_F(BlobCacheTest, DoesntCacheIfKeyIsTooBig) {
+    char key[MAX_KEY_SIZE+1];
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    for (int i = 0; i < MAX_KEY_SIZE+1; i++) {
+        key[i] = 'a';
+    }
+    mBC->set(key, MAX_KEY_SIZE+1, "bbbb", 4);
+    ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE+1, buf, 4));
+    ASSERT_EQ(0xee, buf[0]);
+    ASSERT_EQ(0xee, buf[1]);
+    ASSERT_EQ(0xee, buf[2]);
+    ASSERT_EQ(0xee, buf[3]);
+}
+
+TEST_F(BlobCacheTest, DoesntCacheIfValueIsTooBig) {
+    char buf[MAX_VALUE_SIZE+1];
+    for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
+        buf[i] = 'b';
+    }
+    mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1);
+    for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
+        buf[i] = 0xee;
+    }
+    ASSERT_EQ(size_t(0), mBC->get("abcd", 4, buf, MAX_VALUE_SIZE+1));
+    for (int i = 0; i < MAX_VALUE_SIZE+1; i++) {
+        SCOPED_TRACE(i);
+        ASSERT_EQ(0xee, buf[i]);
+    }
+}
+
+TEST_F(BlobCacheTest, DoesntCacheIfKeyValuePairIsTooBig) {
+    // Check a testing assumptions
+    ASSERT_TRUE(MAX_TOTAL_SIZE < MAX_KEY_SIZE + MAX_VALUE_SIZE);
+    ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE);
+
+    enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE + 1 };
+
+    char key[MAX_KEY_SIZE];
+    char buf[bufSize];
+    for (int i = 0; i < MAX_KEY_SIZE; i++) {
+        key[i] = 'a';
+    }
+    for (int i = 0; i < bufSize; i++) {
+        buf[i] = 'b';
+    }
+
+    mBC->set(key, MAX_KEY_SIZE, buf, MAX_VALUE_SIZE);
+    ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE, NULL, 0));
+}
+
+TEST_F(BlobCacheTest, CacheMaxKeySizeSucceeds) {
+    char key[MAX_KEY_SIZE];
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    for (int i = 0; i < MAX_KEY_SIZE; i++) {
+        key[i] = 'a';
+    }
+    mBC->set(key, MAX_KEY_SIZE, "wxyz", 4);
+    ASSERT_EQ(size_t(4), mBC->get(key, MAX_KEY_SIZE, buf, 4));
+    ASSERT_EQ('w', buf[0]);
+    ASSERT_EQ('x', buf[1]);
+    ASSERT_EQ('y', buf[2]);
+    ASSERT_EQ('z', buf[3]);
+}
+
+TEST_F(BlobCacheTest, CacheMaxValueSizeSucceeds) {
+    char buf[MAX_VALUE_SIZE];
+    for (int i = 0; i < MAX_VALUE_SIZE; i++) {
+        buf[i] = 'b';
+    }
+    mBC->set("abcd", 4, buf, MAX_VALUE_SIZE);
+    for (int i = 0; i < MAX_VALUE_SIZE; i++) {
+        buf[i] = 0xee;
+    }
+    ASSERT_EQ(size_t(MAX_VALUE_SIZE), mBC->get("abcd", 4, buf,
+            MAX_VALUE_SIZE));
+    for (int i = 0; i < MAX_VALUE_SIZE; i++) {
+        SCOPED_TRACE(i);
+        ASSERT_EQ('b', buf[i]);
+    }
+}
+
+TEST_F(BlobCacheTest, CacheMaxKeyValuePairSizeSucceeds) {
+    // Check a testing assumption
+    ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE);
+
+    enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE };
+
+    char key[MAX_KEY_SIZE];
+    char buf[bufSize];
+    for (int i = 0; i < MAX_KEY_SIZE; i++) {
+        key[i] = 'a';
+    }
+    for (int i = 0; i < bufSize; i++) {
+        buf[i] = 'b';
+    }
+
+    mBC->set(key, MAX_KEY_SIZE, buf, bufSize);
+    ASSERT_EQ(size_t(bufSize), mBC->get(key, MAX_KEY_SIZE, NULL, 0));
+}
+
+TEST_F(BlobCacheTest, CacheMinKeyAndValueSizeSucceeds) {
+    char buf[1] = { 0xee };
+    mBC->set("x", 1, "y", 1);
+    ASSERT_EQ(size_t(1), mBC->get("x", 1, buf, 1));
+    ASSERT_EQ('y', buf[0]);
+}
+
+TEST_F(BlobCacheTest, CacheSizeDoesntExceedTotalLimit) {
+    for (int i = 0; i < 256; i++) {
+        uint8_t k = i;
+        mBC->set(&k, 1, "x", 1);
+    }
+    int numCached = 0;
+    for (int i = 0; i < 256; i++) {
+        uint8_t k = i;
+        if (mBC->get(&k, 1, NULL, 0) == 1) {
+            numCached++;
+        }
+    }
+    ASSERT_GE(MAX_TOTAL_SIZE / 2, numCached);
+}
+
+TEST_F(BlobCacheTest, ExceedingTotalLimitHalvesCacheSize) {
+    // Fill up the entire cache with 1 char key/value pairs.
+    const int maxEntries = MAX_TOTAL_SIZE / 2;
+    for (int i = 0; i < maxEntries; i++) {
+        uint8_t k = i;
+        mBC->set(&k, 1, "x", 1);
+    }
+    // Insert one more entry, causing a cache overflow.
+    {
+        uint8_t k = maxEntries;
+        mBC->set(&k, 1, "x", 1);
+    }
+    // Count the number of entries in the cache.
+    int numCached = 0;
+    for (int i = 0; i < maxEntries+1; i++) {
+        uint8_t k = i;
+        if (mBC->get(&k, 1, NULL, 0) == 1) {
+            numCached++;
+        }
+    }
+    ASSERT_EQ(maxEntries/2 + 1, numCached);
+}
+
+class BlobCacheFlattenTest : public BlobCacheTest {
+protected:
+    virtual void SetUp() {
+        BlobCacheTest::SetUp();
+        mBC2 = new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE);
+    }
+
+    virtual void TearDown() {
+        mBC2.clear();
+        BlobCacheTest::TearDown();
+    }
+
+    void roundTrip() {
+        size_t size = mBC->getFlattenedSize();
+        uint8_t* flat = new uint8_t[size];
+        ASSERT_EQ(OK, mBC->flatten(flat, size));
+        ASSERT_EQ(OK, mBC2->unflatten(flat, size));
+        delete[] flat;
+    }
+
+    sp<BlobCache> mBC2;
+};
+
+TEST_F(BlobCacheFlattenTest, FlattenOneValue) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+    roundTrip();
+    ASSERT_EQ(size_t(4), mBC2->get("abcd", 4, buf, 4));
+    ASSERT_EQ('e', buf[0]);
+    ASSERT_EQ('f', buf[1]);
+    ASSERT_EQ('g', buf[2]);
+    ASSERT_EQ('h', buf[3]);
+}
+
+TEST_F(BlobCacheFlattenTest, FlattenFullCache) {
+    // Fill up the entire cache with 1 char key/value pairs.
+    const int maxEntries = MAX_TOTAL_SIZE / 2;
+    for (int i = 0; i < maxEntries; i++) {
+        uint8_t k = i;
+        mBC->set(&k, 1, &k, 1);
+    }
+
+    roundTrip();
+
+    // Verify the deserialized cache
+    for (int i = 0; i < maxEntries; i++) {
+        uint8_t k = i;
+        uint8_t v = 0xee;
+        ASSERT_EQ(size_t(1), mBC2->get(&k, 1, &v, 1));
+        ASSERT_EQ(k, v);
+    }
+}
+
+TEST_F(BlobCacheFlattenTest, FlattenDoesntChangeCache) {
+    // Fill up the entire cache with 1 char key/value pairs.
+    const int maxEntries = MAX_TOTAL_SIZE / 2;
+    for (int i = 0; i < maxEntries; i++) {
+        uint8_t k = i;
+        mBC->set(&k, 1, &k, 1);
+    }
+
+    size_t size = mBC->getFlattenedSize();
+    uint8_t* flat = new uint8_t[size];
+    ASSERT_EQ(OK, mBC->flatten(flat, size));
+    delete[] flat;
+
+    // Verify the cache that we just serialized
+    for (int i = 0; i < maxEntries; i++) {
+        uint8_t k = i;
+        uint8_t v = 0xee;
+        ASSERT_EQ(size_t(1), mBC->get(&k, 1, &v, 1));
+        ASSERT_EQ(k, v);
+    }
+}
+
+TEST_F(BlobCacheFlattenTest, FlattenCatchesBufferTooSmall) {
+    // Fill up the entire cache with 1 char key/value pairs.
+    const int maxEntries = MAX_TOTAL_SIZE / 2;
+    for (int i = 0; i < maxEntries; i++) {
+        uint8_t k = i;
+        mBC->set(&k, 1, &k, 1);
+    }
+
+    size_t size = mBC->getFlattenedSize() - 1;
+    uint8_t* flat = new uint8_t[size];
+    ASSERT_EQ(BAD_VALUE, mBC->flatten(flat, size));
+    delete[] flat;
+}
+
+TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadMagic) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+
+    size_t size = mBC->getFlattenedSize();
+    uint8_t* flat = new uint8_t[size];
+    ASSERT_EQ(OK, mBC->flatten(flat, size));
+    flat[1] = ~flat[1];
+
+    // Bad magic should cause an error.
+    ASSERT_EQ(BAD_VALUE, mBC2->unflatten(flat, size));
+    delete[] flat;
+
+    // The error should cause the unflatten to result in an empty cache
+    ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
+}
+
+TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadBlobCacheVersion) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+
+    size_t size = mBC->getFlattenedSize();
+    uint8_t* flat = new uint8_t[size];
+    ASSERT_EQ(OK, mBC->flatten(flat, size));
+    flat[5] = ~flat[5];
+
+    // Version mismatches shouldn't cause errors, but should not use the
+    // serialized entries
+    ASSERT_EQ(OK, mBC2->unflatten(flat, size));
+    delete[] flat;
+
+    // The version mismatch should cause the unflatten to result in an empty
+    // cache
+    ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
+}
+
+TEST_F(BlobCacheFlattenTest, UnflattenCatchesBadBlobCacheDeviceVersion) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+
+    size_t size = mBC->getFlattenedSize();
+    uint8_t* flat = new uint8_t[size];
+    ASSERT_EQ(OK, mBC->flatten(flat, size));
+    flat[10] = ~flat[10];
+
+    // Version mismatches shouldn't cause errors, but should not use the
+    // serialized entries
+    ASSERT_EQ(OK, mBC2->unflatten(flat, size));
+    delete[] flat;
+
+    // The version mismatch should cause the unflatten to result in an empty
+    // cache
+    ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
+}
+
+TEST_F(BlobCacheFlattenTest, UnflattenCatchesBufferTooSmall) {
+    char buf[4] = { 0xee, 0xee, 0xee, 0xee };
+    mBC->set("abcd", 4, "efgh", 4);
+
+    size_t size = mBC->getFlattenedSize();
+    uint8_t* flat = new uint8_t[size];
+    ASSERT_EQ(OK, mBC->flatten(flat, size));
+
+    // A buffer truncation shouldt cause an error
+    ASSERT_EQ(BAD_VALUE, mBC2->unflatten(flat, size-1));
+    delete[] flat;
+
+    // The error should cause the unflatten to result in an empty cache
+    ASSERT_EQ(size_t(0), mBC2->get("abcd", 4, buf, 4));
+}
+
+} // namespace android
diff --git a/libutils/tests/Looper_test.cpp b/libutils/tests/Looper_test.cpp
new file mode 100644
index 0000000..8bf2ba2
--- /dev/null
+++ b/libutils/tests/Looper_test.cpp
@@ -0,0 +1,693 @@
+//
+// Copyright 2010 The Android Open Source Project
+//
+
+#include <utils/Looper.h>
+#include <utils/Timers.h>
+#include <utils/StopWatch.h>
+#include <gtest/gtest.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "TestHelpers.h"
+
+// # of milliseconds to fudge stopwatch measurements
+#define TIMING_TOLERANCE_MS 25
+
+namespace android {
+
+enum {
+    MSG_TEST1 = 1,
+    MSG_TEST2 = 2,
+    MSG_TEST3 = 3,
+    MSG_TEST4 = 4,
+};
+
+class DelayedWake : public DelayedTask {
+    sp<Looper> mLooper;
+
+public:
+    DelayedWake(int delayMillis, const sp<Looper> looper) :
+        DelayedTask(delayMillis), mLooper(looper) {
+    }
+
+protected:
+    virtual void doTask() {
+        mLooper->wake();
+    }
+};
+
+class DelayedWriteSignal : public DelayedTask {
+    Pipe* mPipe;
+
+public:
+    DelayedWriteSignal(int delayMillis, Pipe* pipe) :
+        DelayedTask(delayMillis), mPipe(pipe) {
+    }
+
+protected:
+    virtual void doTask() {
+        mPipe->writeSignal();
+    }
+};
+
+class CallbackHandler {
+public:
+    void setCallback(const sp<Looper>& looper, int fd, int events) {
+        looper->addFd(fd, 0, events, staticHandler, this);
+    }
+
+protected:
+    virtual ~CallbackHandler() { }
+
+    virtual int handler(int fd, int events) = 0;
+
+private:
+    static int staticHandler(int fd, int events, void* data) {
+        return static_cast<CallbackHandler*>(data)->handler(fd, events);
+    }
+};
+
+class StubCallbackHandler : public CallbackHandler {
+public:
+    int nextResult;
+    int callbackCount;
+
+    int fd;
+    int events;
+
+    StubCallbackHandler(int nextResult) : nextResult(nextResult),
+            callbackCount(0), fd(-1), events(-1) {
+    }
+
+protected:
+    virtual int handler(int fd, int events) {
+        callbackCount += 1;
+        this->fd = fd;
+        this->events = events;
+        return nextResult;
+    }
+};
+
+class StubMessageHandler : public MessageHandler {
+public:
+    Vector<Message> messages;
+
+    virtual void handleMessage(const Message& message) {
+        messages.push(message);
+    }
+};
+
+class LooperTest : public testing::Test {
+protected:
+    sp<Looper> mLooper;
+
+    virtual void SetUp() {
+        mLooper = new Looper(true);
+    }
+
+    virtual void TearDown() {
+        mLooper.clear();
+    }
+};
+
+
+TEST_F(LooperTest, PollOnce_WhenNonZeroTimeoutAndNotAwoken_WaitsForTimeout) {
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal timeout";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT";
+}
+
+TEST_F(LooperTest, PollOnce_WhenNonZeroTimeoutAndAwokenBeforeWaiting_ImmediatelyReturns) {
+    mLooper->wake();
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(1000);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because wake() was called before waiting";
+    EXPECT_EQ(ALOOPER_POLL_WAKE, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because loop was awoken";
+}
+
+TEST_F(LooperTest, PollOnce_WhenNonZeroTimeoutAndAwokenWhileWaiting_PromptlyReturns) {
+    sp<DelayedWake> delayedWake = new DelayedWake(100, mLooper);
+    delayedWake->run();
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(1000);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal wake delay";
+    EXPECT_EQ(ALOOPER_POLL_WAKE, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because loop was awoken";
+}
+
+TEST_F(LooperTest, PollOnce_WhenZeroTimeoutAndNoRegisteredFDs_ImmediatelyReturns) {
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(0);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should be approx. zero";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT";
+}
+
+TEST_F(LooperTest, PollOnce_WhenZeroTimeoutAndNoSignalledFDs_ImmediatelyReturns) {
+    Pipe pipe;
+    StubCallbackHandler handler(true);
+
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(0);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should be approx. zero";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT";
+    EXPECT_EQ(0, handler.callbackCount)
+            << "callback should not have been invoked because FD was not signalled";
+}
+
+TEST_F(LooperTest, PollOnce_WhenZeroTimeoutAndSignalledFD_ImmediatelyInvokesCallbackAndReturns) {
+    Pipe pipe;
+    StubCallbackHandler handler(true);
+
+    ASSERT_EQ(OK, pipe.writeSignal());
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(0);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should be approx. zero";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because FD was signalled";
+    EXPECT_EQ(1, handler.callbackCount)
+            << "callback should be invoked exactly once";
+    EXPECT_EQ(pipe.receiveFd, handler.fd)
+            << "callback should have received pipe fd as parameter";
+    EXPECT_EQ(ALOOPER_EVENT_INPUT, handler.events)
+            << "callback should have received ALOOPER_EVENT_INPUT as events";
+}
+
+TEST_F(LooperTest, PollOnce_WhenNonZeroTimeoutAndNoSignalledFDs_WaitsForTimeoutAndReturns) {
+    Pipe pipe;
+    StubCallbackHandler handler(true);
+
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal timeout";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT";
+    EXPECT_EQ(0, handler.callbackCount)
+            << "callback should not have been invoked because FD was not signalled";
+}
+
+TEST_F(LooperTest, PollOnce_WhenNonZeroTimeoutAndSignalledFDBeforeWaiting_ImmediatelyInvokesCallbackAndReturns) {
+    Pipe pipe;
+    StubCallbackHandler handler(true);
+
+    pipe.writeSignal();
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should be approx. zero";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because FD was signalled";
+    EXPECT_EQ(1, handler.callbackCount)
+            << "callback should be invoked exactly once";
+    EXPECT_EQ(pipe.receiveFd, handler.fd)
+            << "callback should have received pipe fd as parameter";
+    EXPECT_EQ(ALOOPER_EVENT_INPUT, handler.events)
+            << "callback should have received ALOOPER_EVENT_INPUT as events";
+}
+
+TEST_F(LooperTest, PollOnce_WhenNonZeroTimeoutAndSignalledFDWhileWaiting_PromptlyInvokesCallbackAndReturns) {
+    Pipe pipe;
+    StubCallbackHandler handler(true);
+    sp<DelayedWriteSignal> delayedWriteSignal = new DelayedWriteSignal(100, & pipe);
+
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+    delayedWriteSignal->run();
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(1000);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal signal delay";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because FD was signalled";
+    EXPECT_EQ(1, handler.callbackCount)
+            << "callback should be invoked exactly once";
+    EXPECT_EQ(pipe.receiveFd, handler.fd)
+            << "callback should have received pipe fd as parameter";
+    EXPECT_EQ(ALOOPER_EVENT_INPUT, handler.events)
+            << "callback should have received ALOOPER_EVENT_INPUT as events";
+}
+
+TEST_F(LooperTest, PollOnce_WhenCallbackAddedThenRemoved_CallbackShouldNotBeInvoked) {
+    Pipe pipe;
+    StubCallbackHandler handler(true);
+
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+    pipe.writeSignal(); // would cause FD to be considered signalled
+    mLooper->removeFd(pipe.receiveFd);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal timeout because FD was no longer registered";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT";
+    EXPECT_EQ(0, handler.callbackCount)
+            << "callback should not be invoked";
+}
+
+TEST_F(LooperTest, PollOnce_WhenCallbackReturnsFalse_CallbackShouldNotBeInvokedAgainLater) {
+    Pipe pipe;
+    StubCallbackHandler handler(false);
+
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+
+    // First loop: Callback is registered and FD is signalled.
+    pipe.writeSignal();
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(0);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal zero because FD was already signalled";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because FD was signalled";
+    EXPECT_EQ(1, handler.callbackCount)
+            << "callback should be invoked";
+
+    // Second loop: Callback is no longer registered and FD is signalled.
+    pipe.writeSignal();
+
+    stopWatch.reset();
+    result = mLooper->pollOnce(0);
+    elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. equal zero because timeout was zero";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT";
+    EXPECT_EQ(1, handler.callbackCount)
+            << "callback should not be invoked this time";
+}
+
+TEST_F(LooperTest, PollOnce_WhenNonCallbackFdIsSignalled_ReturnsIdent) {
+    const int expectedIdent = 5;
+    void* expectedData = this;
+
+    Pipe pipe;
+
+    pipe.writeSignal();
+    mLooper->addFd(pipe.receiveFd, expectedIdent, ALOOPER_EVENT_INPUT, NULL, expectedData);
+
+    StopWatch stopWatch("pollOnce");
+    int fd;
+    int events;
+    void* data;
+    int result = mLooper->pollOnce(100, &fd, &events, &data);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should be approx. zero";
+    EXPECT_EQ(expectedIdent, result)
+            << "pollOnce result should be the ident of the FD that was signalled";
+    EXPECT_EQ(pipe.receiveFd, fd)
+            << "pollOnce should have returned the received pipe fd";
+    EXPECT_EQ(ALOOPER_EVENT_INPUT, events)
+            << "pollOnce should have returned ALOOPER_EVENT_INPUT as events";
+    EXPECT_EQ(expectedData, data)
+            << "pollOnce should have returned the data";
+}
+
+TEST_F(LooperTest, AddFd_WhenCallbackAdded_ReturnsOne) {
+    Pipe pipe;
+    int result = mLooper->addFd(pipe.receiveFd, 0, ALOOPER_EVENT_INPUT, NULL, NULL);
+
+    EXPECT_EQ(1, result)
+            << "addFd should return 1 because FD was added";
+}
+
+TEST_F(LooperTest, AddFd_WhenIdentIsNegativeAndCallbackIsNull_ReturnsError) {
+    Pipe pipe;
+    int result = mLooper->addFd(pipe.receiveFd, -1, ALOOPER_EVENT_INPUT, NULL, NULL);
+
+    EXPECT_EQ(-1, result)
+            << "addFd should return -1 because arguments were invalid";
+}
+
+TEST_F(LooperTest, AddFd_WhenNoCallbackAndAllowNonCallbacksIsFalse_ReturnsError) {
+    Pipe pipe;
+    sp<Looper> looper = new Looper(false /*allowNonCallbacks*/);
+    int result = looper->addFd(pipe.receiveFd, 0, 0, NULL, NULL);
+
+    EXPECT_EQ(-1, result)
+            << "addFd should return -1 because arguments were invalid";
+}
+
+TEST_F(LooperTest, RemoveFd_WhenCallbackNotAdded_ReturnsZero) {
+    int result = mLooper->removeFd(1);
+
+    EXPECT_EQ(0, result)
+            << "removeFd should return 0 because FD not registered";
+}
+
+TEST_F(LooperTest, RemoveFd_WhenCallbackAddedThenRemovedTwice_ReturnsOnceFirstTimeAndReturnsZeroSecondTime) {
+    Pipe pipe;
+    StubCallbackHandler handler(false);
+    handler.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+
+    // First time.
+    int result = mLooper->removeFd(pipe.receiveFd);
+
+    EXPECT_EQ(1, result)
+            << "removeFd should return 1 first time because FD was registered";
+
+    // Second time.
+    result = mLooper->removeFd(pipe.receiveFd);
+
+    EXPECT_EQ(0, result)
+            << "removeFd should return 0 second time because FD was no longer registered";
+}
+
+TEST_F(LooperTest, PollOnce_WhenCallbackAddedTwice_OnlySecondCallbackShouldBeInvoked) {
+    Pipe pipe;
+    StubCallbackHandler handler1(true);
+    StubCallbackHandler handler2(true);
+
+    handler1.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT);
+    handler2.setCallback(mLooper, pipe.receiveFd, ALOOPER_EVENT_INPUT); // replace it
+    pipe.writeSignal(); // would cause FD to be considered signalled
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    ASSERT_EQ(OK, pipe.readSignal())
+            << "signal should actually have been written";
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because FD was already signalled";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because FD was signalled";
+    EXPECT_EQ(0, handler1.callbackCount)
+            << "original handler callback should not be invoked because it was replaced";
+    EXPECT_EQ(1, handler2.callbackCount)
+            << "replacement handler callback should be invoked";
+}
+
+TEST_F(LooperTest, SendMessage_WhenOneMessageIsEnqueue_ShouldInvokeHandlerDuringNextPoll) {
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessage(handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was already sent";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+}
+
+TEST_F(LooperTest, SendMessage_WhenMultipleMessagesAreEnqueued_ShouldInvokeHandlersInOrderDuringNextPoll) {
+    sp<StubMessageHandler> handler1 = new StubMessageHandler();
+    sp<StubMessageHandler> handler2 = new StubMessageHandler();
+    mLooper->sendMessage(handler1, Message(MSG_TEST1));
+    mLooper->sendMessage(handler2, Message(MSG_TEST2));
+    mLooper->sendMessage(handler1, Message(MSG_TEST3));
+    mLooper->sendMessage(handler1, Message(MSG_TEST4));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(1000);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was already sent";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+    EXPECT_EQ(size_t(3), handler1->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler1->messages[0].what)
+            << "handled message";
+    EXPECT_EQ(MSG_TEST3, handler1->messages[1].what)
+            << "handled message";
+    EXPECT_EQ(MSG_TEST4, handler1->messages[2].what)
+            << "handled message";
+    EXPECT_EQ(size_t(1), handler2->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST2, handler2->messages[0].what)
+            << "handled message";
+}
+
+TEST_F(LooperTest, SendMessageDelayed_WhenSentToTheFuture_ShouldInvokeHandlerAfterDelayTime) {
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessageDelayed(ms2ns(100), handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(1000);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "first poll should end quickly because next message timeout was computed";
+    EXPECT_EQ(ALOOPER_POLL_WAKE, result)
+            << "pollOnce result should be ALOOPER_POLL_WAKE due to wakeup";
+    EXPECT_EQ(size_t(0), handler->messages.size())
+            << "no message handled yet";
+
+    result = mLooper->pollOnce(1000);
+    elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "second poll should end around the time of the delayed message dispatch";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+
+    result = mLooper->pollOnce(100);
+    elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(100 + 100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "third poll should timeout";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT because there were no messages left";
+}
+
+TEST_F(LooperTest, SendMessageDelayed_WhenSentToThePast_ShouldInvokeHandlerDuringNextPoll) {
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessageDelayed(ms2ns(-1000), handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was already sent";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+}
+
+TEST_F(LooperTest, SendMessageDelayed_WhenSentToThePresent_ShouldInvokeHandlerDuringNextPoll) {
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessageDelayed(0, handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was already sent";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+}
+
+TEST_F(LooperTest, SendMessageAtTime_WhenSentToTheFuture_ShouldInvokeHandlerAfterDelayTime) {
+    nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessageAtTime(now + ms2ns(100), handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(1000);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "first poll should end quickly because next message timeout was computed";
+    EXPECT_EQ(ALOOPER_POLL_WAKE, result)
+            << "pollOnce result should be ALOOPER_POLL_WAKE due to wakeup";
+    EXPECT_EQ(size_t(0), handler->messages.size())
+            << "no message handled yet";
+
+    result = mLooper->pollOnce(1000);
+    elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+    EXPECT_NEAR(100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "second poll should end around the time of the delayed message dispatch";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+
+    result = mLooper->pollOnce(100);
+    elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(100 + 100, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "third poll should timeout";
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT because there were no messages left";
+}
+
+TEST_F(LooperTest, SendMessageAtTime_WhenSentToThePast_ShouldInvokeHandlerDuringNextPoll) {
+    nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessageAtTime(now - ms2ns(1000), handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was already sent";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+}
+
+TEST_F(LooperTest, SendMessageAtTime_WhenSentToThePresent_ShouldInvokeHandlerDuringNextPoll) {
+    nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessageAtTime(now, handler, Message(MSG_TEST1));
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(100);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was already sent";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because message was sent";
+    EXPECT_EQ(size_t(1), handler->messages.size())
+            << "handled message";
+    EXPECT_EQ(MSG_TEST1, handler->messages[0].what)
+            << "handled message";
+}
+
+TEST_F(LooperTest, RemoveMessage_WhenRemovingAllMessagesForHandler_ShouldRemoveThoseMessage) {
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessage(handler, Message(MSG_TEST1));
+    mLooper->sendMessage(handler, Message(MSG_TEST2));
+    mLooper->sendMessage(handler, Message(MSG_TEST3));
+    mLooper->removeMessages(handler);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(0);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was sent so looper was awoken";
+    EXPECT_EQ(ALOOPER_POLL_WAKE, result)
+            << "pollOnce result should be ALOOPER_POLL_WAKE because looper was awoken";
+    EXPECT_EQ(size_t(0), handler->messages.size())
+            << "no messages to handle";
+
+    result = mLooper->pollOnce(0);
+
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT because there was nothing to do";
+    EXPECT_EQ(size_t(0), handler->messages.size())
+            << "no messages to handle";
+}
+
+TEST_F(LooperTest, RemoveMessage_WhenRemovingSomeMessagesForHandler_ShouldRemoveThoseMessage) {
+    sp<StubMessageHandler> handler = new StubMessageHandler();
+    mLooper->sendMessage(handler, Message(MSG_TEST1));
+    mLooper->sendMessage(handler, Message(MSG_TEST2));
+    mLooper->sendMessage(handler, Message(MSG_TEST3));
+    mLooper->sendMessage(handler, Message(MSG_TEST4));
+    mLooper->removeMessages(handler, MSG_TEST3);
+    mLooper->removeMessages(handler, MSG_TEST1);
+
+    StopWatch stopWatch("pollOnce");
+    int result = mLooper->pollOnce(0);
+    int32_t elapsedMillis = ns2ms(stopWatch.elapsedTime());
+
+    EXPECT_NEAR(0, elapsedMillis, TIMING_TOLERANCE_MS)
+            << "elapsed time should approx. zero because message was sent so looper was awoken";
+    EXPECT_EQ(ALOOPER_POLL_CALLBACK, result)
+            << "pollOnce result should be ALOOPER_POLL_CALLBACK because two messages were sent";
+    EXPECT_EQ(size_t(2), handler->messages.size())
+            << "no messages to handle";
+    EXPECT_EQ(MSG_TEST2, handler->messages[0].what)
+            << "handled message";
+    EXPECT_EQ(MSG_TEST4, handler->messages[1].what)
+            << "handled message";
+
+    result = mLooper->pollOnce(0);
+
+    EXPECT_EQ(ALOOPER_POLL_TIMEOUT, result)
+            << "pollOnce result should be ALOOPER_POLL_TIMEOUT because there was nothing to do";
+    EXPECT_EQ(size_t(2), handler->messages.size())
+            << "no more messages to handle";
+}
+
+} // namespace android
diff --git a/libutils/tests/LruCache_test.cpp b/libutils/tests/LruCache_test.cpp
new file mode 100644
index 0000000..e573952
--- /dev/null
+++ b/libutils/tests/LruCache_test.cpp
@@ -0,0 +1,291 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <utils/JenkinsHash.h>
+#include <utils/LruCache.h>
+#include <cutils/log.h>
+#include <gtest/gtest.h>
+
+namespace android {
+
+typedef int SimpleKey;
+typedef const char* StringValue;
+
+struct ComplexKey {
+    int k;
+
+    explicit ComplexKey(int k) : k(k) {
+        instanceCount += 1;
+    }
+
+    ComplexKey(const ComplexKey& other) : k(other.k) {
+        instanceCount += 1;
+    }
+
+    ~ComplexKey() {
+        instanceCount -= 1;
+    }
+
+    bool operator ==(const ComplexKey& other) const {
+        return k == other.k;
+    }
+
+    bool operator !=(const ComplexKey& other) const {
+        return k != other.k;
+    }
+
+    static ssize_t instanceCount;
+};
+
+ssize_t ComplexKey::instanceCount = 0;
+
+template<> inline hash_t hash_type(const ComplexKey& value) {
+    return hash_type(value.k);
+}
+
+struct ComplexValue {
+    int v;
+
+    explicit ComplexValue(int v) : v(v) {
+        instanceCount += 1;
+    }
+
+    ComplexValue(const ComplexValue& other) : v(other.v) {
+        instanceCount += 1;
+    }
+
+    ~ComplexValue() {
+        instanceCount -= 1;
+    }
+
+    static ssize_t instanceCount;
+};
+
+ssize_t ComplexValue::instanceCount = 0;
+
+typedef LruCache<ComplexKey, ComplexValue> ComplexCache;
+
+class EntryRemovedCallback : public OnEntryRemoved<SimpleKey, StringValue> {
+public:
+    EntryRemovedCallback() : callbackCount(0), lastKey(-1), lastValue(NULL) { }
+    ~EntryRemovedCallback() {}
+    void operator()(SimpleKey& k, StringValue& v) {
+        callbackCount += 1;
+        lastKey = k;
+        lastValue = v;
+    }
+    ssize_t callbackCount;
+    SimpleKey lastKey;
+    StringValue lastValue;
+};
+
+class LruCacheTest : public testing::Test {
+protected:
+    virtual void SetUp() {
+        ComplexKey::instanceCount = 0;
+        ComplexValue::instanceCount = 0;
+    }
+
+    virtual void TearDown() {
+        ASSERT_NO_FATAL_FAILURE(assertInstanceCount(0, 0));
+    }
+
+    void assertInstanceCount(ssize_t keys, ssize_t values) {
+        if (keys != ComplexKey::instanceCount || values != ComplexValue::instanceCount) {
+            FAIL() << "Expected " << keys << " keys and " << values << " values "
+                    "but there were actually " << ComplexKey::instanceCount << " keys and "
+                    << ComplexValue::instanceCount << " values";
+        }
+    }
+};
+
+TEST_F(LruCacheTest, Empty) {
+    LruCache<SimpleKey, StringValue> cache(100);
+
+    EXPECT_EQ(NULL, cache.get(0));
+    EXPECT_EQ(0u, cache.size());
+}
+
+TEST_F(LruCacheTest, Simple) {
+    LruCache<SimpleKey, StringValue> cache(100);
+
+    cache.put(1, "one");
+    cache.put(2, "two");
+    cache.put(3, "three");
+    EXPECT_STREQ("one", cache.get(1));
+    EXPECT_STREQ("two", cache.get(2));
+    EXPECT_STREQ("three", cache.get(3));
+    EXPECT_EQ(3u, cache.size());
+}
+
+TEST_F(LruCacheTest, MaxCapacity) {
+    LruCache<SimpleKey, StringValue> cache(2);
+
+    cache.put(1, "one");
+    cache.put(2, "two");
+    cache.put(3, "three");
+    EXPECT_EQ(NULL, cache.get(1));
+    EXPECT_STREQ("two", cache.get(2));
+    EXPECT_STREQ("three", cache.get(3));
+    EXPECT_EQ(2u, cache.size());
+}
+
+TEST_F(LruCacheTest, RemoveLru) {
+    LruCache<SimpleKey, StringValue> cache(100);
+
+    cache.put(1, "one");
+    cache.put(2, "two");
+    cache.put(3, "three");
+    cache.removeOldest();
+    EXPECT_EQ(NULL, cache.get(1));
+    EXPECT_STREQ("two", cache.get(2));
+    EXPECT_STREQ("three", cache.get(3));
+    EXPECT_EQ(2u, cache.size());
+}
+
+TEST_F(LruCacheTest, GetUpdatesLru) {
+    LruCache<SimpleKey, StringValue> cache(100);
+
+    cache.put(1, "one");
+    cache.put(2, "two");
+    cache.put(3, "three");
+    EXPECT_STREQ("one", cache.get(1));
+    cache.removeOldest();
+    EXPECT_STREQ("one", cache.get(1));
+    EXPECT_EQ(NULL, cache.get(2));
+    EXPECT_STREQ("three", cache.get(3));
+    EXPECT_EQ(2u, cache.size());
+}
+
+uint32_t hash_int(int x) {
+    return JenkinsHashWhiten(JenkinsHashMix(0, x));
+}
+
+TEST_F(LruCacheTest, StressTest) {
+    const size_t kCacheSize = 512;
+    LruCache<SimpleKey, StringValue> cache(512);
+    const size_t kNumKeys = 16 * 1024;
+    const size_t kNumIters = 100000;
+    char* strings[kNumKeys];
+
+    for (size_t i = 0; i < kNumKeys; i++) {
+        strings[i] = (char *)malloc(16);
+        sprintf(strings[i], "%d", i);
+    }
+
+    srandom(12345);
+    int hitCount = 0;
+    for (size_t i = 0; i < kNumIters; i++) {
+        int index = random() % kNumKeys;
+        uint32_t key = hash_int(index);
+        const char *val = cache.get(key);
+        if (val != NULL) {
+            EXPECT_EQ(strings[index], val);
+            hitCount++;
+        } else {
+            cache.put(key, strings[index]);
+        }
+    }
+    size_t expectedHitCount = kNumIters * kCacheSize / kNumKeys;
+    EXPECT_LT(int(expectedHitCount * 0.9), hitCount);
+    EXPECT_GT(int(expectedHitCount * 1.1), hitCount);
+    EXPECT_EQ(kCacheSize, cache.size());
+
+    for (size_t i = 0; i < kNumKeys; i++) {
+        free((void *)strings[i]);
+    }
+}
+
+TEST_F(LruCacheTest, NoLeak) {
+    ComplexCache cache(100);
+
+    cache.put(ComplexKey(0), ComplexValue(0));
+    cache.put(ComplexKey(1), ComplexValue(1));
+    EXPECT_EQ(2, cache.size());
+    assertInstanceCount(2, 3);  // the null value counts as an instance
+}
+
+TEST_F(LruCacheTest, Clear) {
+    ComplexCache cache(100);
+
+    cache.put(ComplexKey(0), ComplexValue(0));
+    cache.put(ComplexKey(1), ComplexValue(1));
+    EXPECT_EQ(2, cache.size());
+    assertInstanceCount(2, 3);
+    cache.clear();
+    assertInstanceCount(0, 1);
+}
+
+TEST_F(LruCacheTest, ClearNoDoubleFree) {
+    {
+        ComplexCache cache(100);
+
+        cache.put(ComplexKey(0), ComplexValue(0));
+        cache.put(ComplexKey(1), ComplexValue(1));
+        EXPECT_EQ(2, cache.size());
+        assertInstanceCount(2, 3);
+        cache.removeOldest();
+        cache.clear();
+        assertInstanceCount(0, 1);
+    }
+    assertInstanceCount(0, 0);
+}
+
+TEST_F(LruCacheTest, ClearReuseOk) {
+    ComplexCache cache(100);
+
+    cache.put(ComplexKey(0), ComplexValue(0));
+    cache.put(ComplexKey(1), ComplexValue(1));
+    EXPECT_EQ(2, cache.size());
+    assertInstanceCount(2, 3);
+    cache.clear();
+    assertInstanceCount(0, 1);
+    cache.put(ComplexKey(0), ComplexValue(0));
+    cache.put(ComplexKey(1), ComplexValue(1));
+    EXPECT_EQ(2, cache.size());
+    assertInstanceCount(2, 3);
+}
+
+TEST_F(LruCacheTest, Callback) {
+    LruCache<SimpleKey, StringValue> cache(100);
+    EntryRemovedCallback callback;
+    cache.setOnEntryRemovedListener(&callback);
+
+    cache.put(1, "one");
+    cache.put(2, "two");
+    cache.put(3, "three");
+    EXPECT_EQ(3, cache.size());
+    cache.removeOldest();
+    EXPECT_EQ(1, callback.callbackCount);
+    EXPECT_EQ(1, callback.lastKey);
+    EXPECT_STREQ("one", callback.lastValue);
+}
+
+TEST_F(LruCacheTest, CallbackOnClear) {
+    LruCache<SimpleKey, StringValue> cache(100);
+    EntryRemovedCallback callback;
+    cache.setOnEntryRemovedListener(&callback);
+
+    cache.put(1, "one");
+    cache.put(2, "two");
+    cache.put(3, "three");
+    EXPECT_EQ(3, cache.size());
+    cache.clear();
+    EXPECT_EQ(3, callback.callbackCount);
+}
+
+}
diff --git a/libutils/tests/String8_test.cpp b/libutils/tests/String8_test.cpp
new file mode 100644
index 0000000..c42c68d
--- /dev/null
+++ b/libutils/tests/String8_test.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "String8_test"
+#include <utils/Log.h>
+#include <utils/String8.h>
+
+#include <gtest/gtest.h>
+
+namespace android {
+
+class String8Test : public testing::Test {
+protected:
+    virtual void SetUp() {
+    }
+
+    virtual void TearDown() {
+    }
+};
+
+TEST_F(String8Test, Cstr) {
+    String8 tmp("Hello, world!");
+
+    EXPECT_STREQ(tmp.string(), "Hello, world!");
+}
+
+TEST_F(String8Test, OperatorPlus) {
+    String8 src1("Hello, ");
+
+    // Test adding String8 + const char*
+    const char* ccsrc2 = "world!";
+    String8 dst1 = src1 + ccsrc2;
+    EXPECT_STREQ(dst1.string(), "Hello, world!");
+    EXPECT_STREQ(src1.string(), "Hello, ");
+    EXPECT_STREQ(ccsrc2, "world!");
+
+    // Test adding String8 + String8
+    String8 ssrc2("world!");
+    String8 dst2 = src1 + ssrc2;
+    EXPECT_STREQ(dst2.string(), "Hello, world!");
+    EXPECT_STREQ(src1.string(), "Hello, ");
+    EXPECT_STREQ(ssrc2.string(), "world!");
+}
+
+TEST_F(String8Test, OperatorPlusEquals) {
+    String8 src1("My voice");
+
+    // Testing String8 += String8
+    String8 src2(" is my passport.");
+    src1 += src2;
+    EXPECT_STREQ(src1.string(), "My voice is my passport.");
+    EXPECT_STREQ(src2.string(), " is my passport.");
+
+    // Adding const char* to the previous string.
+    const char* src3 = " Verify me.";
+    src1 += src3;
+    EXPECT_STREQ(src1.string(), "My voice is my passport. Verify me.");
+    EXPECT_STREQ(src2.string(), " is my passport.");
+    EXPECT_STREQ(src3, " Verify me.");
+}
+
+}
diff --git a/libutils/tests/TestHelpers.h b/libutils/tests/TestHelpers.h
new file mode 100644
index 0000000..d8e985e
--- /dev/null
+++ b/libutils/tests/TestHelpers.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef TESTHELPERS_H
+#define TESTHELPERS_H
+
+#include <utils/threads.h>
+
+namespace android {
+
+class Pipe {
+public:
+    int sendFd;
+    int receiveFd;
+
+    Pipe() {
+        int fds[2];
+        ::pipe(fds);
+
+        receiveFd = fds[0];
+        sendFd = fds[1];
+    }
+
+    ~Pipe() {
+        if (sendFd != -1) {
+            ::close(sendFd);
+        }
+
+        if (receiveFd != -1) {
+            ::close(receiveFd);
+        }
+    }
+
+    status_t writeSignal() {
+        ssize_t nWritten = ::write(sendFd, "*", 1);
+        return nWritten == 1 ? 0 : -errno;
+    }
+
+    status_t readSignal() {
+        char buf[1];
+        ssize_t nRead = ::read(receiveFd, buf, 1);
+        return nRead == 1 ? 0 : nRead == 0 ? -EPIPE : -errno;
+    }
+};
+
+class DelayedTask : public Thread {
+    int mDelayMillis;
+
+public:
+    DelayedTask(int delayMillis) : mDelayMillis(delayMillis) { }
+
+protected:
+    virtual ~DelayedTask() { }
+
+    virtual void doTask() = 0;
+
+    virtual bool threadLoop() {
+        usleep(mDelayMillis * 1000);
+        doTask();
+        return false;
+    }
+};
+
+} // namespace android
+
+#endif // TESTHELPERS_H
diff --git a/libutils/tests/Unicode_test.cpp b/libutils/tests/Unicode_test.cpp
new file mode 100644
index 0000000..18c130c
--- /dev/null
+++ b/libutils/tests/Unicode_test.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "Unicode_test"
+#include <utils/Log.h>
+#include <utils/Unicode.h>
+
+#include <gtest/gtest.h>
+
+namespace android {
+
+class UnicodeTest : public testing::Test {
+protected:
+    virtual void SetUp() {
+    }
+
+    virtual void TearDown() {
+    }
+};
+
+TEST_F(UnicodeTest, UTF8toUTF16ZeroLength) {
+    ssize_t measured;
+
+    const uint8_t str[] = { };
+
+    measured = utf8_to_utf16_length(str, 0);
+    EXPECT_EQ(0, measured)
+            << "Zero length input should return zero length output.";
+}
+
+TEST_F(UnicodeTest, UTF8toUTF16ASCIILength) {
+    ssize_t measured;
+
+    // U+0030 or ASCII '0'
+    const uint8_t str[] = { 0x30 };
+
+    measured = utf8_to_utf16_length(str, sizeof(str));
+    EXPECT_EQ(1, measured)
+            << "ASCII glyphs should have a length of 1 char16_t";
+}
+
+TEST_F(UnicodeTest, UTF8toUTF16Plane1Length) {
+    ssize_t measured;
+
+    // U+2323 SMILE
+    const uint8_t str[] = { 0xE2, 0x8C, 0xA3 };
+
+    measured = utf8_to_utf16_length(str, sizeof(str));
+    EXPECT_EQ(1, measured)
+            << "Plane 1 glyphs should have a length of 1 char16_t";
+}
+
+TEST_F(UnicodeTest, UTF8toUTF16SurrogateLength) {
+    ssize_t measured;
+
+    // U+10000
+    const uint8_t str[] = { 0xF0, 0x90, 0x80, 0x80 };
+
+    measured = utf8_to_utf16_length(str, sizeof(str));
+    EXPECT_EQ(2, measured)
+            << "Surrogate pairs should have a length of 2 char16_t";
+}
+
+TEST_F(UnicodeTest, UTF8toUTF16TruncatedUTF8) {
+    ssize_t measured;
+
+    // Truncated U+2323 SMILE
+    // U+2323 SMILE
+    const uint8_t str[] = { 0xE2, 0x8C };
+
+    measured = utf8_to_utf16_length(str, sizeof(str));
+    EXPECT_EQ(-1, measured)
+            << "Truncated UTF-8 should return -1 to indicate invalid";
+}
+
+TEST_F(UnicodeTest, UTF8toUTF16Normal) {
+    const uint8_t str[] = {
+        0x30, // U+0030, 1 UTF-16 character
+        0xC4, 0x80, // U+0100, 1 UTF-16 character
+        0xE2, 0x8C, 0xA3, // U+2323, 1 UTF-16 character
+        0xF0, 0x90, 0x80, 0x80, // U+10000, 2 UTF-16 character
+    };
+
+    char16_t output[1 + 1 + 1 + 2 + 1]; // Room for NULL
+
+    utf8_to_utf16(str, sizeof(str), output);
+
+    EXPECT_EQ(0x0030, output[0])
+            << "should be U+0030";
+    EXPECT_EQ(0x0100, output[1])
+            << "should be U+0100";
+    EXPECT_EQ(0x2323, output[2])
+            << "should be U+2323";
+    EXPECT_EQ(0xD800, output[3])
+            << "should be first half of surrogate U+10000";
+    EXPECT_EQ(0xDC00, output[4])
+            << "should be second half of surrogate U+10000";
+    EXPECT_EQ(NULL, output[5])
+            << "should be NULL terminated";
+}
+
+}
diff --git a/libutils/tests/Vector_test.cpp b/libutils/tests/Vector_test.cpp
new file mode 100644
index 0000000..d29c054
--- /dev/null
+++ b/libutils/tests/Vector_test.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "Vector_test"
+
+#include <utils/Vector.h>
+#include <cutils/log.h>
+#include <gtest/gtest.h>
+#include <unistd.h>
+
+namespace android {
+
+class VectorTest : public testing::Test {
+protected:
+    virtual void SetUp() {
+    }
+
+    virtual void TearDown() {
+    }
+
+public:
+};
+
+
+TEST_F(VectorTest, CopyOnWrite_CopyAndAddElements) {
+
+    Vector<int> vector;
+    Vector<int> other;
+    vector.setCapacity(8);
+
+    vector.add(1);
+    vector.add(2);
+    vector.add(3);
+
+    EXPECT_EQ(vector.size(), 3);
+
+    // copy the vector
+    other = vector;
+
+    EXPECT_EQ(other.size(), 3);
+
+    // add an element to the first vector
+    vector.add(4);
+
+    // make sure the sizes are correct
+    EXPECT_EQ(vector.size(), 4);
+    EXPECT_EQ(other.size(), 3);
+
+    // add an element to the copy
+    other.add(5);
+
+    // make sure the sizes are correct
+    EXPECT_EQ(vector.size(), 4);
+    EXPECT_EQ(other.size(), 4);
+
+    // make sure the content of both vectors are correct
+    EXPECT_EQ(vector[3], 4);
+    EXPECT_EQ(other[3], 5);
+}
+
+
+} // namespace android