If you, in blink, are looking for a class testing::Test (from gtest) and you have included the ::blink::testing helper namespace, then you have to prepend testing::Test with ::.
Since you can't know when someone will make blink::testing visible, it's better to always use ::testing for gtest classes.
Currently half the usages are ::testing, and half testing.
To avoid too many exclusions in jumbo, I plan to convert them all to ::testing (since jumbo will make blink::testing visible to much more code).
Comment 1 by bugdroid1@chromium.org
, Jul 4 2017