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

third_party/WebKit/Source/core/layout/CollapsedBorderValueTest.cpp

 // 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.
 
 #include "core/layout/CollapsedBorderValue.h"
 
 #include "core/style/ComputedStyle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class CollapsedBorderValueTest : public testing::Test {
+class CollapsedBorderValueTest : public ::testing::Test {
  protected:
   void ExpectInvisible(const CollapsedBorderValue& v,
                        unsigned expected_width = 0) {
     EXPECT_EQ(expected_width, v.Width());
     EXPECT_FALSE(v.IsVisible());
     EXPECT_FALSE(v.LessThan(v));
     EXPECT_FALSE(v.LessThan(CollapsedBorderValue()));
     EXPECT_TRUE(v.VisuallyEquals(v));
     EXPECT_TRUE(v.VisuallyEquals(CollapsedBorderValue()));
     EXPECT_TRUE(CollapsedBorderValue().VisuallyEquals(v));
@@ skipping 128 matching lines @@
       // j is put before i to make testing logs easier to understand because
       // SCOPED_TRACE prints j first.
       EXPECT_EQ(rank[j] < rank[i], values[j].LessThan(values[i]));
       EXPECT_EQ(rank[j] == rank[i], values[j].IsSameIgnoringColor(values[i]));
       EXPECT_EQ(expected_covers_joint[j][i], values[j].CoversJoint(values[i]));
     }
   }
 }
 
 }  // namespace blink