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This CL is adding unittests for some basic scripts on MacOS.

Previously, on MacOS, an empty array of test candidates was
used. We are adding some of basics languages.

Bug: 1022455
Change-Id: I5f1e32feb40cc6c3a6bf22f96821b9e78ceb3906
Fixed: 5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001142
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741488}