Require the actual `RelayVariable` in tests.
Require the actual `RelayVariable` in tests.

Reviewed By: wincent

Differential Revision: D3106748

fb-gh-sync-id: 741be73c933e92c95df1246c2390bc74f710ef60
fbshipit-source-id: 741be73c933e92c95df1246c2390bc74f710ef60

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