set an env variable when running tests
set an env variable when running tests

Reviewed By: gabelevi

Differential Revision: D3172441

fb-gh-sync-id: d6b7aee43c7501dbaa3cecc9558a45ef68aa8ef5
fbshipit-source-id: d6b7aee43c7501dbaa3cecc9558a45ef68aa8ef5

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