I don't have hg yet on my new laptop; we should just skip tests if the user is missing binaries. Add a convenience method to do this.
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btrahan - Commits
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rPcea1432782d0: Skip Mercurial tests if `hg` is not present
Got clean arc unit --everything with no hg installed.
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Buildable 3342 Build 3349: [Placeholder Plan] Wait for 30 Seconds