Add browser test for CustomizationWallpaperDownloader.

chrome/browser/chromeos/login/wallpaper_manager_test_utils.h

+// Copyright 2014 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_TEST_UTILS_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_TEST_UTILS_H_
+
+#include <vector>
+
+#include "ash/ash_constants.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace base {
+class CommandLine;
+class ScopedTempDir;
+}  // namespace base
+
+namespace chromeos {
+// This class is actually used as namespace.
+// It should not have non-static methods.

[bshe, 2014/04/29 23:24:06]

You can probably just use namespace test_utils instead of a class. This way you
dont need to make all methods static

[Alexander Alekseev, 2014/04/30 00:04:44]

Done.

It used 'list_' member directly in the previous version.

+class WallpaperManagerTestUtils {
+ public:
+  static bool CreateJPEGImage(int width,
+                              int height,
+                              SkColor color,
+                              std::vector<unsigned char>* output);
+
+  // Creates a test image of given size.
+  static gfx::ImageSkia CreateTestImage(int width, int height, SkColor color);
+
+  // Writes a JPEG image of the specified size and color to |path|. Returns
+  // true on success.
+  static bool WriteJPEGFile(const base::FilePath& path,
+                            int width,
+                            int height,
+                            SkColor color);
+
+  // Returns true if the color at the center of |image| is close to
+  // |expected_color|. (The center is used so small wallpaper images can be
+  // used.)
+  static bool ImageIsNearColor(gfx::ImageSkia image, SkColor expected_color);
+
+  // Wait until all wallpaper loading is done, and WallpaperManager comes into
+  // a stable state.
+  static void WaitAsyncWallpaperLoadFinished();
+
+  // Colors used for different default wallpapers by
+  // CreateCmdlineWallpapers().
+  static const SkColor kLargeDefaultWallpaperColor;
+  static const SkColor kSmallDefaultWallpaperColor;
+  static const SkColor kLargeGuestWallpaperColor;
+  static const SkColor kSmallGuestWallpaperColor;
+
+  // A custom color, pecifically chosen to not
+  // conflict with any of the default wallpaper colors.
+  static const SkColor kCustomWallpaperColor;
+
+  // Dimension used for width and height of default wallpaper images. A
+  // small value is used to minimize the amount of time spent compressing
+  // and writing images.
+  static const int kWallpaperSize;
+
+  // Initializes default wallpaper paths "*default_*file" and writes JPEG
+  // wallpaper images to them.
+  // Only needs to be called (once) by tests that want to test loading of
+  // default wallpapers.
+  static void CreateCmdlineWallpapers(
+      const base::ScopedTempDir& dir,
+      scoped_ptr<base::CommandLine>* command_line);
+
+ private:
+  WallpaperManagerTestUtils();  // not implemented
+
+  DISALLOW_COPY_AND_ASSIGN(WallpaperManagerTestUtils);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_TEST_UTILS_H_