Forcing isolation

Sometimes it is useful to force a separate test runner instance for each test executed. The --isolated flag will cause testr to execute a separate runner per test

  $ testr run --isolated

In this mode testr first determines tests to run (either automatically listed, using the failing set, or a user supplied load-list), and then spawns one test runner per test it runs. To avoid cross-test-runner interactions concurrency is disabled in this mode. --analyze-isolation supercedes --isolated if they are both supplied.