run-tests: make failure reporting in unittest mode equivalent to default Unlike unittest's defaults, our result formatter does not print stack traces. Here, we change TestResult.addFailure() to be compatible with the existing/default execution mode.

run-tests: ignore failures from rmtree rmtree() may fail under certain conditions. We ignore failures at the individual test level because they can interfere with test execution. Furthermore, we'll reattempt deletion in the high-level test runner after all tests have finished. Note that this patch is not a code refactor like most of the patches before it. This change logically makes sense given the execution behavior of the tests.

run-tests: abort tests after first failure in unittest mode There is an execution mode on run-tests.py that stops after the first failure. unittest mode was previously not obeying this option. This patch fixes that.

run-tests: print compatible output from TextTestRunner Our unittest TextTestRunner now prints output similar to the output from the default execution mode - the output people expect from run-tests.py.