Add a test for a multipart image as cache

third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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     // This part finishes. The image is created, callbacks are sent, and the data buffer is cleared.
     cachedImage->loader()->didFinishLoading(nullptr, 0.0, 0);
     ASSERT_FALSE(cachedImage->resourceBuffer());
     ASSERT_FALSE(cachedImage->errorOccurred());
     ASSERT_TRUE(cachedImage->hasImage());
     ASSERT_FALSE(cachedImage->getImage()->isNull());
     ASSERT_EQ(cachedImage->getImage()->width(), 1);
     ASSERT_EQ(cachedImage->getImage()->height(), 1);
     ASSERT_EQ(client->imageChangedCount(), 1);
     ASSERT_TRUE(client->notifyFinishedCalled());
+
+    // When the multipart image is retrieved from the cache, the image is empty.
+    cachedImage = ImageResource::create(ResourceRequest(testURL));
+    ASSERT_FALSE(cachedImage->resourceBuffer());
+    ASSERT_FALSE(cachedImage->errorOccurred());
+    ASSERT_FALSE(cachedImage->hasImage());
+    ASSERT_TRUE(cachedImage->getImage()->isNull());
 }
 
 TEST(ImageResourceTest, CancelOnDetach)
 {
     KURL testURL(ParsedURLString, "http://www.test.com/cancelTest.html");
     URLTestHelpers::registerMockedURLLoad(testURL, "cancelTest.html", "text/html");
 
     ResourceFetcher* fetcher = ResourceFetcher::create(ImageResourceTestMockFetchContext::create());
 
     // Emulate starting a real load.
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     ASSERT_TRUE(imageResource->hasImage());
     EXPECT_FALSE(imageResource->getImage()->isNull());
     EXPECT_EQ(2, client->imageChangedCount());
     EXPECT_TRUE(client->notifyFinishedCalled());
     EXPECT_FALSE(imageResource->getImage()->isBitmapImage());
     EXPECT_EQ(300, imageResource->getImage()->width());
     EXPECT_EQ(300, imageResource->getImage()->height());
 }
 
 } // namespace blink