[ash-md] Wired in the Shelf color to be derived from the Wallpaper.

components/wallpaper/wallpaper_color_calculator_unittest.cc

Index: components/wallpaper/wallpaper_color_calculator_unittest.cc
diff --git a/components/wallpaper/wallpaper_color_calculator_unittest.cc b/components/wallpaper/wallpaper_color_calculator_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bc65acfa086cafd37b25fc01116a57be94fe3616
--- /dev/null
+++ b/components/wallpaper/wallpaper_color_calculator_unittest.cc
@@ -0,0 +1,147 @@
+// Copyright 2017 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 "components/wallpaper/wallpaper_color_calculator.h"
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/test/null_task_runner.h"
+#include "base/test/test_mock_time_task_runner.h"
+#include "base/threading/sequenced_task_runner_handle.h"
+#include "components/wallpaper/wallpaper_color_calculator_observer.h"
+#include "skia/ext/platform_canvas.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/color_analysis.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace wallpaper {
+namespace {
+
+const SkColor kDefaultColor = SK_ColorTRANSPARENT;
+
+class TestWallpaperColorCalculatorObserver
+    : public WallpaperColorCalculatorObserver {
+ public:
+  TestWallpaperColorCalculatorObserver() {}
+
+  ~TestWallpaperColorCalculatorObserver() override {}
+
+  bool WasNotified() const { return notified_; }
+
+  // WallpaperColorCalculatorObserver:
+  void OnColorCalculationComplete() override { notified_ = true; }
+
+ private:
+  bool notified_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWallpaperColorCalculatorObserver);
+};
+
+}  // namespace
+
+class WallPaperColorCalculatorTest : public testing::Test {
+ public:
+  WallPaperColorCalculatorTest();
+  ~WallPaperColorCalculatorTest() override;
+
+ protected:
+  void InstallTaskRunner(scoped_refptr<base::SequencedTaskRunner> task_runner);
+
+  gfx::ImageSkia image_;
+
+  std::unique_ptr<WallpaperColorCalculator> calculator_;
+
+  scoped_refptr<base::TestMockTimeTaskRunner> task_runner_;
+
+  TestWallpaperColorCalculatorObserver observer_;
+
+ private:
+  // Required by PostTaskAndReplyImpl.
+  std::unique_ptr<base::SequencedTaskRunnerHandle> task_runner_handle_;
+
+  DISALLOW_COPY_AND_ASSIGN(WallPaperColorCalculatorTest);
+};
+
+WallPaperColorCalculatorTest::WallPaperColorCalculatorTest()
+    : task_runner_(new base::TestMockTimeTaskRunner()) {
+  // Creates an |image_| that will yield a non-default prominent color.
+  const gfx::Size kImageSize(300, 200);
+  const SkColor kGray = SkColorSetRGB(10, 10, 10);
+  const SkColor kVibrantGreen = SkColorSetRGB(25, 200, 25);
+
+  gfx::Canvas canvas(kImageSize, 1.0f, true);
+  canvas.FillRect(gfx::Rect(kImageSize), kGray);
+  canvas.FillRect(gfx::Rect(0, 1, 300, 1), kVibrantGreen);
+
+  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());
+  image_ = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
+
+  calculator_ = base::MakeUnique<WallpaperColorCalculator>(
+      image_, color_utils::LumaRange::NORMAL,
+      color_utils::SaturationRange::VIBRANT, nullptr);
+  calculator_->AddObserver(&observer_);
+
+  InstallTaskRunner(task_runner_);
+}
+
+WallPaperColorCalculatorTest::~WallPaperColorCalculatorTest() {}
+
+void WallPaperColorCalculatorTest::InstallTaskRunner(
+    scoped_refptr<base::SequencedTaskRunner> task_runner) {
+  task_runner_handle_.reset();
+  task_runner_handle_ =
+      base::MakeUnique<base::SequencedTaskRunnerHandle>(task_runner);
+  calculator_->SetTaskRunnerForTest(task_runner);
+}
+
+TEST_F(WallPaperColorCalculatorTest,
+       StartCalculationReturnsFalseWhenPostingTaskFails) {
+  scoped_refptr<base::NullTaskRunner> task_runner = new base::NullTaskRunner();
+  InstallTaskRunner(task_runner);
+  calculator_->set_prominent_color_for_test(SK_ColorBLACK);
+
+  EXPECT_FALSE(calculator_->StartCalculation());
+  EXPECT_EQ(kDefaultColor, calculator_->prominent_color());
+}
+
+TEST_F(WallPaperColorCalculatorTest, ObserverNotifiedOnSuccessfulCalculation) {
+  EXPECT_FALSE(observer_.WasNotified());
+
+  EXPECT_TRUE(calculator_->StartCalculation());
+  EXPECT_FALSE(observer_.WasNotified());
+
+  task_runner_->RunUntilIdle();
+  EXPECT_TRUE(observer_.WasNotified());
+}
+
+TEST_F(WallPaperColorCalculatorTest, ColorUpdatedOnSuccessfulCalculation) {
+  calculator_->set_prominent_color_for_test(kDefaultColor);
+
+  EXPECT_TRUE(calculator_->StartCalculation());
+  EXPECT_EQ(kDefaultColor, calculator_->prominent_color());
+
+  task_runner_->RunUntilIdle();
+  EXPECT_NE(kDefaultColor, calculator_->prominent_color());
+}
+
+TEST_F(WallPaperColorCalculatorTest,
+       NoCrashWhenCalculatorDestroyedBeforeTaskProcessing) {
+  EXPECT_TRUE(calculator_->StartCalculation());
+  calculator_.reset();
+
+  EXPECT_TRUE(task_runner_->HasPendingTask());
+
+  task_runner_->RunUntilIdle();
+  EXPECT_FALSE(observer_.WasNotified());
+  EXPECT_FALSE(task_runner_->HasPendingTask());
+}
+
+}  // namespace wallpaper