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diff --git a/Example/Messaging/Tests/FIRMessagingFakeSocket.h b/Example/Messaging/Tests/FIRMessagingFakeSocket.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 "FIRMessagingSecureSocket.h"
+
+@interface FIRMessagingFakeSocket : FIRMessagingSecureSocket
+
+/**
+ * Initialize socket with a given buffer size. Designated Initializer.
+ *
+ *  @param bufferSize  The buffer size used to connect the input and the output stream. Note
+ *                     when we write data to the output stream it's read in terms of this buffer
+ *                     size. So for tests using `FIRMessagingFakeSocket` you should use an appropriate
+ *                     buffer size in terms of what you are writing to the buffer and what should
+ *                     be read. Since there is no "flush" operation in NSStream we would have to
+ *                     live with this.
+ *
+ *  @see {FIRMessagingSecureSocketTest} for example usage.
+ *  @return A fake secure socket.
+ */
+- (instancetype)initWithBufferSize:(uint8_t)bufferSize;
+
+@end