[Mac] Star as a rhs-decoration in AutocompleteTextFieldCell.

chrome/browser/cocoa/location_bar/image_decoration_unittest.mm

+// Copyright (c) 2010 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>
+
+#import "chrome/browser/cocoa/location_bar/image_decoration.h"
+
+#import "chrome/browser/cocoa/cocoa_test_helper.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class ImageDecorationTest : public CocoaTest {
+ public:
+  ImageDecoration decoration_;
+};
+
+TEST_F(ImageDecorationTest, SetGetImage) {
+  EXPECT_FALSE(decoration_.GetImage());
+
+  const NSSize kImageSize = NSMakeSize(20.0, 20.0);
+  scoped_nsobject<NSImage> image([[NSImage alloc] initWithSize:kImageSize]);
+
+  decoration_.SetImage(image);
+  EXPECT_EQ(decoration_.GetImage(), image);
+
+  decoration_.SetImage(nil);
+  EXPECT_FALSE(decoration_.GetImage());
+}
+
+TEST_F(ImageDecorationTest, GetWidthForSpace) {
+  const CGFloat kWide = 100.0;
+  const CGFloat kNarrow = 10.0;
+
+  // Decoration with no image is omitted.
+  EXPECT_EQ(decoration_.GetWidthForSpace(kWide),
+            LocationBarDecoration::kOmittedWidth);
+
+  const NSSize kImageSize = NSMakeSize(20.0, 20.0);
+  scoped_nsobject<NSImage> image([[NSImage alloc] initWithSize:kImageSize]);
+
+  // Decoration takes up the space of the image.
+  decoration_.SetImage(image);
+  EXPECT_EQ(decoration_.GetWidthForSpace(kWide), kImageSize.width);
+
+  // If the image doesn't fit, decoration is omitted.
+  EXPECT_EQ(decoration_.GetWidthForSpace(kNarrow),
+            LocationBarDecoration::kOmittedWidth);
+}
+
+// TODO(shess): It would be nice to test mouse clicks and dragging,
+// but those are hard because they require a real |owner|.
+
+}  // namespace