[codequery] basic unit test infrastructure for prolog queries on ml(.cmt) code
[codequery] basic unit test infrastructure for prolog queries on ml(.cmt) code

Summary: This should make it easier to test things in the future.

Test Plan:
$ ./pfff_test prolog_ml
$ ./pfff_test all

Reviewers: pieter

Reviewed By: pieter

CC: julienv

Differential Revision: https://phabricator.fb.com/D652940

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