Summary:
Test that the ApplicativeDo extension batches things correctly in the
Haxl monad.
Test Plan: beholdunittests
Reviewed By: bnitka@fb.com
Subscribers: ldbrandy, memo, watashi, smarlow, akr, bnitka, jcoens
FB internal diff: D2039149
Tasks: 5504687
Signature: t1:2039149:1430501733:98fd1cf0f69663d6db3b07c3aed6e261ae9884d6
