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diff --git a/Firestore/Example/Tests/SpecTests/FSTMockDatastore.h b/Firestore/Example/Tests/SpecTests/FSTMockDatastore.h
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+/*
+ * Copyright 2017 Google
+ *
+ * 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "Remote/FSTDatastore.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FSTMockDatastore : FSTDatastore
+
++ (instancetype)mockDatastoreWithWorkerDispatchQueue:(FSTDispatchQueue *)workerDispatchQueue;
+
+#pragma mark - Watch Stream manipulation.
+
+/** Injects an Added WatchChange containing the given targetIDs. */
+- (void)writeWatchTargetAddedWithTargetIDs:(NSArray<FSTBoxedTargetID *> *)targetIDs;
+
+/** Injects an Added WatchChange that marks the given targetIDs current. */
+- (void)writeWatchCurrentWithTargetIDs:(NSArray<FSTBoxedTargetID *> *)targetIDs
+                       snapshotVersion:(FSTSnapshotVersion *)snapshotVersion
+                           resumeToken:(NSData *)resumeToken;
+
+/** Injects a WatchChange as though it had come from the backend. */
+- (void)writeWatchChange:(FSTWatchChange *)change snapshotVersion:(FSTSnapshotVersion *)snap;
+
+/** Injects a stream failure as though it had come from the backend. */
+- (void)failWatchStreamWithError:(NSError *)error;
+
+/** Returns the set of active targets on the watch stream. */
+- (NSDictionary<FSTBoxedTargetID *, FSTQueryData *> *)activeTargets;
+
+/** Helper method to expose watch stream state to verify in tests. */
+- (BOOL)isWatchStreamOpen;
+
+#pragma mark - Write Stream manipulation.
+
+/**
+ * Returns the next write that was "sent to the backend", failing if there are no queued sent
+ */
+- (NSArray<FSTMutation *> *)nextSentWrite;
+
+/** Returns the number of writes that have been sent to the backend but not waited on yet. */
+- (int)writesSent;
+
+/** Injects a write ack as though it had come from the backend in response to a write. */
+- (void)ackWriteWithVersion:(FSTSnapshotVersion *)commitVersion
+            mutationResults:(NSArray<FSTMutationResult *> *)results;
+
+/** Injects a stream failure as though it had come from the backend. */
+- (void)failWriteWithError:(NSError *_Nullable)error;
+
+@end
+
+NS_ASSUME_NONNULL_END