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diff --git a/Example/Messaging/Tests/FIRMessagingFakeSocket.m b/Example/Messaging/Tests/FIRMessagingFakeSocket.m
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+++ b/Example/Messaging/Tests/FIRMessagingFakeSocket.m
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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 "FIRMessagingFakeSocket.h"
+
+#import "FIRMessagingConstants.h"
+#import "FIRMessagingDefines.h"
+#import <GoogleToolboxForMac/GTMDefines.h>
+
+@interface FIRMessagingSecureSocket() <NSStreamDelegate>
+
+@property(nonatomic, readwrite, assign) FIRMessagingSecureSocketState state;
+@property(nonatomic, readwrite, strong) NSInputStream *inStream;
+@property(nonatomic, readwrite, strong) NSOutputStream *outStream;
+
+@property(nonatomic, readwrite, assign) BOOL isInStreamOpen;
+@property(nonatomic, readwrite, assign) BOOL isOutStreamOpen;
+
+@property(nonatomic, readwrite, strong) NSRunLoop *runLoop;
+
+@end
+
+@interface FIRMessagingFakeSocket ()
+
+@property(nonatomic, readwrite, assign) int8_t bufferSize;
+
+@end
+
+@implementation FIRMessagingFakeSocket
+
+- (instancetype)initWithBufferSize:(uint8_t)bufferSize {
+  self = [super init];
+  if (self) {
+    _bufferSize = bufferSize;
+  }
+  return self;
+}
+
+- (void)connectToHost:(NSString *)host
+                 port:(NSUInteger)port
+            onRunLoop:(NSRunLoop *)runLoop {
+  self.state = kFIRMessagingSecureSocketOpening;
+  self.runLoop = runLoop;
+
+  CFReadStreamRef inputStreamRef = nil;
+  CFWriteStreamRef outputStreamRef = nil;
+
+  CFStreamCreateBoundPair(NULL,
+                          &inputStreamRef,
+                          &outputStreamRef,
+                          self.bufferSize);
+
+  self.inStream = CFBridgingRelease(inputStreamRef);
+  self.outStream = CFBridgingRelease(outputStreamRef);
+  if (!self.inStream || !self.outStream) {
+    FIRMessaging_FAIL(@"cannot create a fake socket");
+    return;
+  }
+
+  self.isInStreamOpen = NO;
+  self.isOutStreamOpen = NO;
+
+  [self openStream:self.outStream];
+  [self openStream:self.inStream];
+}
+
+- (void)openStream:(NSStream *)stream {
+  _GTMDevAssert(stream, @"Cannot open nil stream");
+  if (stream) {
+    stream.delegate = self;
+    [stream scheduleInRunLoop:self.runLoop forMode:NSDefaultRunLoopMode];
+    [stream open];
+  }
+}
+
+@end