When running sub-tests explicitly on the command line and that sub-test
fails, the test harness returns `0` from `main()`. This is problematic
in automated testing environments as failed tests can be hidden.
This patch iterates over all the test results in the `resultTestList`
after all sub-tests have completed, if any of the tests failed a
non-zero value is returned from `parseAndCallCommandLineTests()` which
is then propagated up the call stack to `main()`.
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