tests/silenttestrunner.py

debugdirstate: deprecate --nodates in favor of --no-dates

We have supported 'no-' prefixes for boolean flag for a few years now,
so I was expecting it to be --no-dates.

I noticed that we have --nodates options for a few more commands
(e.g. `hg diff`), but I'll leave that for another day.

Differential Revision: https://phab.mercurial-scm.org/D4693

from __future__ import absolute_import, print_function
import os
import sys
import unittest

def main(modulename):
    '''run the tests found in module, printing nothing when all tests pass'''
    module = sys.modules[modulename]
    suite = unittest.defaultTestLoader.loadTestsFromModule(module)
    results = unittest.TestResult()
    suite.run(results)
    if results.errors or results.failures:
        for tc, exc in results.errors:
            print('ERROR:', tc)
            print()
            sys.stdout.write(exc)
        for tc, exc in results.failures:
            print('FAIL:', tc)
            print()
            sys.stdout.write(exc)
        sys.exit(1)

if os.environ.get('SILENT_BE_NOISY'):
    main = unittest.main