cmake: enable running the tests
authorAdam Simpkins <simpkins@fb.com>
Fri, 19 Jan 2018 04:43:19 +0000 (20:43 -0800)
committerFacebook Github Bot <facebook-github-bot@users.noreply.github.com>
Fri, 19 Jan 2018 05:04:33 +0000 (21:04 -0800)
Summary:
CMake 3.9+ includes built-in support for gtest.  This updates the CMake build
scripts to make use of this if the GoogleTest module is available.

Reviewed By: meyering

Differential Revision: D6745369

fbshipit-source-id: 1ef978874b9a0ef2cc5f48ab1c7a0b55d0f1155e


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