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由 Mark Lapierre 提交于
Uses the parallel_tests gem to execute tests in multiple processes simultaneously on the same machine. Adds the `--parallel` CLI option that instructs the QA framework to use the parallel_tests executable. Tests need access to global state contained in `Runtime::Scenario` so when `--parallel` is invoked `Runtime::Scenario` is serialized to an environment variable, which is passed to parallel_tests, and then deserialized in `spec_helper`.
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