Allow for empty last_run files for parallel tests #533
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Fixes #410
When running tests in parallel using parallel_tests and parallel_tests-fine_grain_test sometimes one thread will be completely starved from running any tests which results in an empty last_run json file which blows up when collecting all the results. This PR makes it so we don't try to parse an empty string as json and instead return
nil
as if the file wasn't there at all.Since there were no tests for
SimpleCov::LastRun
I took the liberty of writing tests for everything including the change I made.