Add background_tile_view for tiling an image as UI background (about box need...

chrome/browser/cocoa/background_tile_view_unittest.mm

+// Copyright (c) 2009 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 <Cocoa/Cocoa.h>
+
+#include "base/scoped_nsobject.h"
+#import "chrome/browser/cocoa/background_tile_view.h"
+#import "chrome/browser/cocoa/cocoa_test_helper.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class BackgroundTileViewTest : public testing::Test {
+ public:
+  BackgroundTileViewTest() {
+    NSRect frame = NSMakeRect(0, 0, 100, 30);
+    view_.reset([[BackgroundTileView alloc] initWithFrame:frame]);
+    [cocoa_helper_.contentView() addSubview:view_.get()];
+  }
+
+  CocoaTestHelper cocoa_helper_;  // Inits Cocoa, creates window, etc...
+  scoped_nsobject<BackgroundTileView> view_;
+};
+
+// Test adding/removing from the view hierarchy, mostly to ensure nothing
+// leaks or crashes.
+TEST_F(BackgroundTileViewTest, AddRemove) {
+  EXPECT_EQ(cocoa_helper_.contentView(), [view_ superview]);
+  [view_.get() removeFromSuperview];
+  EXPECT_FALSE([view_ superview]);
+}
+
+// Test drawing, mostly to ensure nothing leaks or crashes.
+TEST_F(BackgroundTileViewTest, Display) {
+  // Without image set.
+  [view_ display];
+  // And now with an image.
+  NSImage* image = [NSImage imageNamed:@"NSApplicationIcon"];
+  [view_ setTileImage:image];
+  [view_ display];
+}
+
+}  // namespace