[Cocoa] Tab audio mute control, behind a switch (off by default).

chrome/browser/ui/cocoa/tabs/media_indicator_button_unittest.mm

 // Copyright 2013 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.
 
-#import "chrome/browser/ui/cocoa/tabs/media_indicator_view.h"
+#import "chrome/browser/ui/cocoa/tabs/media_indicator_button.h"
 
+#include <string>
+
+#include "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/message_loop/message_loop.h"
 #import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
+#include "chrome/common/chrome_switches.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
+// A simple target to confirm an action was invoked.
+@interface MediaIndicatorButtonTestTarget : NSObject {
+ @private
+  int count_;
+}
+@property(readonly, nonatomic) int count;
+- (void)incrementCount:(id)sender;
+@end
+
+@implementation MediaIndicatorButtonTestTarget
+@synthesize count = count_;
+- (void)incrementCount:(id)sender {
+  ++count_;
+}
+@end
+
 namespace {
 
-class MediaIndicatorViewTest : public CocoaTest {
+class MediaIndicatorButtonTest : public CocoaTest {
  public:
-  MediaIndicatorViewTest() {
-    view_.reset([[MediaIndicatorView alloc] init]);
-    EXPECT_TRUE(view_ != nil);
-    EXPECT_EQ(TAB_MEDIA_STATE_NONE, [view_ animatingMediaState]);
+  MediaIndicatorButtonTest() {
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        std::string("--") + switches::kEnableTabAudioMuting);
 
-    [[test_window() contentView] addSubview:view_.get()];
+    // Create the MediaIndicatorButton and add it to a view.
+    button_.reset([[MediaIndicatorButton alloc] init]);
+    EXPECT_TRUE(button_ != nil);
+    [[test_window() contentView] addSubview:button_.get()];
 
-    [view_ updateIndicator:TAB_MEDIA_STATE_AUDIO_PLAYING];
-    EXPECT_EQ(TAB_MEDIA_STATE_AUDIO_PLAYING, [view_ animatingMediaState]);
+    // Initially the button is disabled and showing no indicator.
+    EXPECT_EQ(TAB_MEDIA_STATE_NONE, [button_ showingMediaState]);
+    EXPECT_FALSE([button_ isEnabled]);
+
+    // Register target to be notified of clicks.
+    base::scoped_nsobject<MediaIndicatorButtonTestTarget> clickTarget(
+        [[MediaIndicatorButtonTestTarget alloc] init]);
+    EXPECT_EQ(0, [clickTarget count]);
+    [button_ setClickTarget:clickTarget withAction:@selector(incrementCount:)];
+
+    // Transition to audio indicator mode, and expect button is enabled.
+    [button_ transitionToMediaState:TAB_MEDIA_STATE_AUDIO_PLAYING];
+    EXPECT_EQ(TAB_MEDIA_STATE_AUDIO_PLAYING, [button_ showingMediaState]);
+    EXPECT_TRUE([button_ isEnabled]);
+
+    // Click, and expect one click notification.
+    EXPECT_EQ(0, [clickTarget count]);
+    [button_ performClick:button_];
+    EXPECT_EQ(1, [clickTarget count]);
+
+    // Transition to audio muting mode, and expect button is still enabled.  A
+    // click should result in another click notification.
+    [button_ transitionToMediaState:TAB_MEDIA_STATE_AUDIO_MUTING];
+    EXPECT_EQ(TAB_MEDIA_STATE_AUDIO_MUTING, [button_ showingMediaState]);
+    EXPECT_TRUE([button_ isEnabled]);
+    [button_ performClick:button_];
+    EXPECT_EQ(2, [clickTarget count]);
+
+    // Transition to capturing mode.  Now, the button is disabled since it
+    // should only be drawing the indicator icon (i.e., there is nothing to
+    // mute).  A click should NOT result in another click notification.
+    [button_ transitionToMediaState:TAB_MEDIA_STATE_CAPTURING];
+    EXPECT_EQ(TAB_MEDIA_STATE_CAPTURING, [button_ showingMediaState]);
+    EXPECT_FALSE([button_ isEnabled]);
+    [button_ performClick:button_];
+    EXPECT_EQ(2, [clickTarget count]);
   }
 
-  base::scoped_nsobject<MediaIndicatorView> view_;
+  base::scoped_nsobject<MediaIndicatorButton> button_;
   base::MessageLoopForUI message_loop_;  // Needed for gfx::Animation.
 };
 
-TEST_VIEW(MediaIndicatorViewTest, view_)
+TEST_VIEW(MediaIndicatorButtonTest, button_)
 
 }  // namespace