Expose thumbnails of pages to iOS share extensions.

ui/base/test/ios/ui_image_test_utils_unittest.mm

+// 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.
+
+#import "ui/base/test/ios/ui_image_test_utils.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ui {
+namespace test {
+
+// Test the creation of UIImages.
+TEST(UIImageTestUtilsTest, TestImageCreation) {
+  CGSize size = CGSizeMake(10, 10);
+  UIImage* image =
+      uiimage_utils::UIImageWithSizeAndSolidColor(size, [UIColor redColor]);
+  EXPECT_TRUE(CGSizeEqualToSize(size, image.size));
+}
+
+// Test the detection of identical UIImages.
+TEST(UIImageTestUtilsTest, TestImageEquality) {
+  CGSize size10x10 = CGSizeMake(10, 10);
+  CGSize size5x20 = CGSizeMake(5, 20);
+  UIColor* green = [UIColor greenColor];
+  UIColor* blue = [UIColor blueColor];
+
+  UIImage* imageblue10x10 =
+      uiimage_utils::UIImageWithSizeAndSolidColor(size10x10, blue);
+  UIImage* imageblue5x20 =
+      uiimage_utils::UIImageWithSizeAndSolidColor(size5x20, blue);
+  UIImage* imageGreen10x10 =
+      uiimage_utils::UIImageWithSizeAndSolidColor(size10x10, green);
+  UIImage* imageGreen10x10Bis =
+      uiimage_utils::UIImageWithSizeAndSolidColor(size10x10, green);
+
+  // Test with |nil| parameters.
+  EXPECT_TRUE(uiimage_utils::UIImagesAreEqual(nil, nil));
+  EXPECT_FALSE(uiimage_utils::UIImagesAreEqual(nil, imageblue10x10));
+  EXPECT_FALSE(uiimage_utils::UIImagesAreEqual(imageblue10x10, nil));
+
+  // Test with images with different sizes (but same amount of pixels), same
+  // color.
+  EXPECT_FALSE(uiimage_utils::UIImagesAreEqual(imageblue10x10, imageblue5x20));
+
+  // Test with images with same size, different color.
+  EXPECT_FALSE(
+      uiimage_utils::UIImagesAreEqual(imageblue10x10, imageGreen10x10));
+
+  // Test with images with same size, same color.
+  EXPECT_TRUE(
+      uiimage_utils::UIImagesAreEqual(imageGreen10x10, imageGreen10x10Bis));
+}
+
+}  // namespace test
+}  // namespace ui