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diff --git a/core/src/test/java/com/android/volley/AsyncRequestQueueTest.java b/core/src/test/java/com/android/volley/AsyncRequestQueueTest.java
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+++ b/core/src/test/java/com/android/volley/AsyncRequestQueueTest.java
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+/*
+ * 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.
+ */
+
+package com.android.volley;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.when;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import com.android.volley.AsyncCache.OnGetCompleteCallback;
+import com.android.volley.AsyncCache.OnWriteCompleteCallback;
+import com.android.volley.mock.ShadowSystemClock;
+import com.android.volley.toolbox.NoAsyncCache;
+import com.android.volley.toolbox.StringRequest;
+import com.android.volley.utils.ImmediateResponseDelivery;
+import com.google.common.util.concurrent.MoreExecutors;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ScheduledExecutorService;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+
+/** Unit tests for AsyncRequestQueue, with all dependencies mocked out */
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = {ShadowSystemClock.class})
+public class AsyncRequestQueueTest {
+
+    @Mock private AsyncNetwork mMockNetwork;
+    @Mock private ScheduledExecutorService mMockScheduledExecutor;
+    private final ResponseDelivery mDelivery = new ImmediateResponseDelivery();
+    private AsyncRequestQueue queue;
+
+    @Before
+    public void setUp() throws Exception {
+        initMocks(this);
+        queue = createRequestQueue(new NoAsyncCache());
+    }
+
+    @Test
+    public void cancelAll_onlyCorrectTag() throws Exception {
+        queue.start();
+        Object tagA = new Object();
+        Object tagB = new Object();
+        StringRequest req1 = mock(StringRequest.class);
+        when(req1.getTag()).thenReturn(tagA);
+        StringRequest req2 = mock(StringRequest.class);
+        when(req2.getTag()).thenReturn(tagB);
+        StringRequest req3 = mock(StringRequest.class);
+        when(req3.getTag()).thenReturn(tagA);
+        StringRequest req4 = mock(StringRequest.class);
+        when(req4.getTag()).thenReturn(tagA);
+
+        queue.add(req1); // A
+        queue.add(req2); // B
+        queue.add(req3); // A
+        queue.cancelAll(tagA);
+        queue.add(req4); // A
+
+        verify(req1).cancel(); // A cancelled
+        verify(req3).cancel(); // A cancelled
+        verify(req2, never()).cancel(); // B not cancelled
+        verify(req4, never()).cancel(); // A added after cancel not cancelled
+        queue.stop();
+    }
+
+    @Test
+    public void add_notifiesListener() throws Exception {
+        RequestQueue.RequestEventListener listener = mock(RequestQueue.RequestEventListener.class);
+        queue.start();
+        queue.addRequestEventListener(listener);
+        StringRequest req = mock(StringRequest.class);
+
+        queue.add(req);
+
+        verify(listener).onRequestEvent(req, RequestQueue.RequestEvent.REQUEST_QUEUED);
+        verifyNoMoreInteractions(listener);
+        queue.stop();
+    }
+
+    @Test
+    public void finish_notifiesListener() throws Exception {
+        RequestQueue.RequestEventListener listener = mock(RequestQueue.RequestEventListener.class);
+        queue.start();
+        queue.addRequestEventListener(listener);
+        StringRequest req = mock(StringRequest.class);
+
+        queue.finish(req);
+
+        verify(listener).onRequestEvent(req, RequestQueue.RequestEvent.REQUEST_FINISHED);
+        verifyNoMoreInteractions(listener);
+        queue.stop();
+    }
+
+    @Test
+    public void sendRequestEvent_notifiesListener() throws Exception {
+        StringRequest req = mock(StringRequest.class);
+        RequestQueue.RequestEventListener listener = mock(RequestQueue.RequestEventListener.class);
+        queue.start();
+        queue.addRequestEventListener(listener);
+
+        queue.sendRequestEvent(req, RequestQueue.RequestEvent.REQUEST_NETWORK_DISPATCH_STARTED);
+
+        verify(listener)
+                .onRequestEvent(req, RequestQueue.RequestEvent.REQUEST_NETWORK_DISPATCH_STARTED);
+        verifyNoMoreInteractions(listener);
+        queue.stop();
+    }
+
+    @Test
+    public void removeRequestEventListener_removesListener() throws Exception {
+        StringRequest req = mock(StringRequest.class);
+        RequestQueue.RequestEventListener listener = mock(RequestQueue.RequestEventListener.class);
+        queue.start();
+        queue.addRequestEventListener(listener);
+        queue.removeRequestEventListener(listener);
+
+        queue.sendRequestEvent(req, RequestQueue.RequestEvent.REQUEST_NETWORK_DISPATCH_STARTED);
+
+        verifyNoMoreInteractions(listener);
+        queue.stop();
+    }
+
+    @Test
+    public void requestsQueuedBeforeCacheInitialization_asyncCache() {
+        // Create a new queue with a mock cache in order to verify the initialization.
+        AsyncCache mockAsyncCache = mock(AsyncCache.class);
+        AsyncRequestQueue queue = createRequestQueue(mockAsyncCache);
+        queue.start();
+
+        ArgumentCaptor<OnWriteCompleteCallback> callbackCaptor =
+                ArgumentCaptor.forClass(OnWriteCompleteCallback.class);
+        verify(mockAsyncCache).initialize(callbackCaptor.capture());
+
+        StringRequest req = mock(StringRequest.class);
+        req.setShouldCache(true);
+        when(req.getCacheKey()).thenReturn("cache-key");
+        queue.add(req);
+
+        // Cache should not be read before initialization completes.
+        verify(mockAsyncCache, never()).get(anyString(), any(OnGetCompleteCallback.class));
+
+        callbackCaptor.getValue().onWriteComplete();
+
+        // Once the write completes, the request should be kicked off (in the form of a cache
+        // lookup).
+        verify(mockAsyncCache).get(eq("cache-key"), any(OnGetCompleteCallback.class));
+
+        queue.stop();
+    }
+
+    private AsyncRequestQueue createRequestQueue(AsyncCache asyncCache) {
+        return new AsyncRequestQueue.Builder(mMockNetwork)
+                .setResponseDelivery(mDelivery)
+                .setAsyncCache(asyncCache)
+                .setExecutorFactory(
+                        new AsyncRequestQueue.ExecutorFactory() {
+                            @Override
+                            public ExecutorService createNonBlockingExecutor(
+                                    BlockingQueue<Runnable> taskQueue) {
+                                return MoreExecutors.newDirectExecutorService();
+                            }
+
+                            @Override
+                            public ExecutorService createBlockingExecutor(
+                                    BlockingQueue<Runnable> taskQueue) {
+                                return MoreExecutors.newDirectExecutorService();
+                            }
+
+                            @Override
+                            public ScheduledExecutorService createNonBlockingScheduledExecutor() {
+                                return mMockScheduledExecutor;
+                            }
+                        })
+                .build();
+    }
+}