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diff --git a/test-runner/src/android/test/mock/MockContentResolver.java b/test-runner/src/android/test/mock/MockContentResolver.java
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+++ b/test-runner/src/android/test/mock/MockContentResolver.java
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+/*
+ * Copyright (C) 2008 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.
+ */
+
+package android.test.mock;
+
+import android.content.ContentProvider;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.IContentProvider;
+import android.database.ContentObserver;
+import android.net.Uri;
+
+import com.google.android.collect.Maps;
+
+import java.util.Map;
+
+/**
+ * A mock {@link android.content.ContentResolver} class that isolates the test code from the real
+ * content system.  All methods are non-functional and throw
+ * {@link java.lang.UnsupportedOperationException}.  
+ *
+ * <p>This only isolates the test code in ways that have proven useful so far. More should be
+ * added as they become a problem.
+ */
+public class MockContentResolver extends ContentResolver {
+    Map<String, ContentProvider> mProviders;
+
+    public MockContentResolver() {
+        super(null);
+        mProviders = Maps.newHashMap();
+    }
+
+    public void addProvider(String name, ContentProvider provider) {
+        mProviders.put(name, provider);
+    }
+
+    /** @hide */
+    @Override
+    protected IContentProvider acquireProvider(Context context, String name) {
+        final ContentProvider provider = mProviders.get(name);
+        if (provider != null) {
+            return provider.getIContentProvider();
+        } else {
+            return null;
+        }
+    }
+
+    /** @hide */
+    @Override
+    public boolean releaseProvider(IContentProvider provider) {
+        return true;
+    }
+
+    @Override
+    public void notifyChange(Uri uri, ContentObserver observer, boolean syncToNetwork) {
+    }
+}