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diff --git a/libs/hwui/unit_tests/DamageAccumulatorTests.cpp b/libs/hwui/unit_tests/DamageAccumulatorTests.cpp
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+++ b/libs/hwui/unit_tests/DamageAccumulatorTests.cpp
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+/*
+ * Copyright (C) 2015 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 <gtest/gtest.h>
+
+#include <DamageAccumulator.h>
+#include <Matrix.h>
+#include <utils/LinearAllocator.h>
+
+#include <SkRect.h>
+
+using namespace android;
+using namespace android::uirenderer;
+
+// Test that push & pop are propegating the dirty rect
+// There is no transformation of the dirty rect, the input is the same
+// as the output.
+TEST(DamageAccumulator, identity) {
+    DamageAccumulator da;
+    Matrix4 identity;
+    SkRect curDirty;
+    identity.loadIdentity();
+    da.pushTransform(&identity);
+    da.dirty(50, 50, 100, 100);
+    da.pushTransform(&identity);
+    da.peekAtDirty(&curDirty);
+    ASSERT_EQ(SkRect(), curDirty);
+    da.popTransform();
+    da.peekAtDirty(&curDirty);
+    ASSERT_EQ(SkRect::MakeLTRB(50, 50, 100, 100), curDirty);
+    da.popTransform();
+    da.finish(&curDirty);
+    ASSERT_EQ(SkRect::MakeLTRB(50, 50, 100, 100), curDirty);
+}
+
+// Test that transformation is happening at the correct levels via
+// peekAtDirty & popTransform. Just uses a simple translate to test this
+TEST(DamageAccumulator, translate) {
+    DamageAccumulator da;
+    Matrix4 translate;
+    SkRect curDirty;
+    translate.loadTranslate(25, 25, 0);
+    da.pushTransform(&translate);
+    da.dirty(50, 50, 100, 100);
+    da.peekAtDirty(&curDirty);
+    ASSERT_EQ(SkRect::MakeLTRB(50, 50, 100, 100), curDirty);
+    da.popTransform();
+    da.finish(&curDirty);
+    ASSERT_EQ(SkRect::MakeLTRB(75, 75, 125, 125), curDirty);
+}
+
+// Test that dirty rectangles are being unioned across "siblings
+TEST(DamageAccumulator, union) {
+    DamageAccumulator da;
+    Matrix4 identity;
+    SkRect curDirty;
+    identity.loadIdentity();
+    da.pushTransform(&identity);
+    da.pushTransform(&identity);
+    da.dirty(50, 50, 100, 100);
+    da.popTransform();
+    da.pushTransform(&identity);
+    da.dirty(150, 50, 200, 125);
+    da.popTransform();
+    da.popTransform();
+    da.finish(&curDirty);
+    ASSERT_EQ(SkRect::MakeLTRB(50, 50, 200, 125), curDirty);
+}