Upstream Chrome on iOS source code [1/11].

ios/chrome/browser/callback_counter_unittest.mm

Index: ios/chrome/browser/callback_counter_unittest.mm
diff --git a/ios/chrome/browser/callback_counter_unittest.mm b/ios/chrome/browser/callback_counter_unittest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..f257245bd0b8d5f801af96821cd7493922c6d5f9
--- /dev/null
+++ b/ios/chrome/browser/callback_counter_unittest.mm
@@ -0,0 +1,36 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ios/chrome/browser/callback_counter.h"
+
+#include "base/bind.h"
+#include "base/mac/bind_objc_block.h"
+#include "base/memory/ref_counted.h"
+#import "base/test/ios/wait_util.h"
+#include "testing/platform_test.h"
+
+// Tests that CallbackCounter works with 2 callbacks.
+TEST(CallbackCounterTest, Basic) {
+  __block BOOL block_was_called = NO;
+  scoped_refptr<CallbackCounter> callback_counter =
+      new CallbackCounter(base::BindBlock(^{
+        block_was_called = YES;
+      }));
+
+  // Enqueue the first callback.
+  callback_counter->IncrementCount();
+  dispatch_async(dispatch_get_main_queue(), ^{
+    callback_counter->DecrementCount();
+  });
+
+  // Enqueue the second callback.
+  callback_counter->IncrementCount();
+  dispatch_async(dispatch_get_main_queue(), ^{
+    callback_counter->DecrementCount();
+  });
+
+  base::test::ios::WaitUntilCondition(^bool() {
+    return block_was_called;
+  });
+}