Audio indicator: cross platform drawing and animation

chrome/browser/ui/tabs/tab_audio_indicator_unittest.cc

+// Copyright (c) 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.
+
+#include "chrome/browser/ui/tabs/tab_audio_indicator.h"
+
+#include "base/message_loop.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/animation/linear_animation.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/rect.h"
+
+class TabAudioIndicatorTest : public TabAudioIndicator::Delegate,
+                              public testing::Test {
+ protected:
+  TabAudioIndicatorTest() : schedule_paint_count_(0) {}
+
+  virtual void ScheduleAudioIndicatorPaint() OVERRIDE {
+    ++schedule_paint_count_;
+  }
+
+  int schedule_paint_count_;
+  MessageLoopForUI message_loop_;  // Needed for ui::LinearAnimation.
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TabAudioIndicatorTest);
+};
+
+TEST_F(TabAudioIndicatorTest, AnimationState) {
+  // Start animating.
+  TabAudioIndicator indicator(this);
+  indicator.SetIsPlayingAudio(true);
+  EXPECT_EQ(TabAudioIndicator::STATE_ANIMATING, indicator.state_);
+  EXPECT_TRUE(indicator.IsAnimating());
+
+  // Once the audio stops the indicator should switch to ending animation.
+  indicator.SetIsPlayingAudio(false);
+  EXPECT_EQ(TabAudioIndicator::STATE_ANIMATION_ENDING, indicator.state_);
+  EXPECT_TRUE(indicator.IsAnimating());
+
+  // Once the ending animation is complete animation should stop.
+  indicator.animation_->End();
+  EXPECT_EQ(TabAudioIndicator::STATE_NOT_ANIMATING, indicator.state_);
+  EXPECT_FALSE(indicator.IsAnimating());
+}
+
+TEST_F(TabAudioIndicatorTest, Paint) {
+  TabAudioIndicator indicator(this);
+  indicator.SetIsPlayingAudio(true);
+
+  gfx::Rect rect(0, 0, 16, 16);
+  gfx::Canvas canvas(rect.size(), ui::SCALE_FACTOR_100P, true);
+  indicator.Paint(&canvas, rect);

[cpu_(ooo_6.6-7.5), 2013/03/11 02:40:27]

what are we testing here?

[sail, 2013/03/11 23:16:13]

Just exercising the code to make sure nothing leaks for crashes. Added comment.

+}
+
+TEST_F(TabAudioIndicatorTest, SchedulePaint) {
+  TabAudioIndicator indicator(this);
+  indicator.SetIsPlayingAudio(true);
+
+  indicator.animation_->SetCurrentValue(1.0);
+  schedule_paint_count_ = 0;
+  indicator.AnimationProgressed(NULL);
+  EXPECT_EQ(1, schedule_paint_count_);
+}