Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/core/html/HTMLImageElementTest.cpp

 // Copyright 2015 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.
 
 #include "core/html/HTMLImageElement.h"
 
 #include <memory>
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrameView.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 const int kViewportWidth = 500;
 const int kViewportHeight = 600;
-class HTMLImageElementTest : public testing::Test {
+class HTMLImageElementTest : public ::testing::Test {
  protected:
   HTMLImageElementTest()
       : dummy_page_holder_(
             DummyPageHolder::Create(IntSize(kViewportWidth, kViewportHeight))) {
   }
 
   std::unique_ptr<DummyPageHolder> dummy_page_holder_;
 };
 
 TEST_F(HTMLImageElementTest, width) {
@@ skipping 10 matching lines @@
 TEST_F(HTMLImageElementTest, sourceSize) {
   HTMLImageElement* image = HTMLImageElement::Create(
       dummy_page_holder_->GetDocument(), /* createdByParser */ false);
   image->setAttribute(HTMLNames::widthAttr, "400");
   EXPECT_EQ(kViewportWidth, image->SourceSize(*image));
   image->setAttribute(HTMLNames::sizesAttr, "50vw");
   EXPECT_EQ(250, image->SourceSize(*image));
 }
 
 }  // namespace blink