tests/silenttestrunner.py

branch: add tests which shows branch can be closed from a non-branchhead cset

This patch shows that we can close a branch even from a cset which is not
a branch head. It was supposed to abort this operation.
Next patch will be fixing the issue.

Differential Revision: https://phab.mercurial-scm.org/D6281

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