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diff --git a/Firestore/Example/Tests/Local/FSTQueryCacheTests.h b/Firestore/Example/Tests/Local/FSTQueryCacheTests.h
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+++ b/Firestore/Example/Tests/Local/FSTQueryCacheTests.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 "Local/FSTQueryCache.h"
+
+#import <XCTest/XCTest.h>
+
+@protocol FSTPersistence;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * These are tests for any implementation of the FSTQueryCache protocol.
+ *
+ * To test a specific implementation of FSTQueryCache:
+ *
+ * + Subclass FSTQueryCacheTests
+ * + override -setUp, assigning to queryCache and persistence
+ * + override -tearDown, cleaning up queryCache and persistence
+ */
+@interface FSTQueryCacheTests : XCTestCase
+
+/** The implementation of the query cache to test. */
+@property(nonatomic, strong, nullable) id<FSTQueryCache> queryCache;
+
+/**
+ * The persistence implementation to use while testing the queryCache (e.g. for committing write
+ * groups).
+ */
+@property(nonatomic, strong, nullable) id<FSTPersistence> persistence;
+
+@end
+
+NS_ASSUME_NONNULL_END