def testDetectVCS(self):
root = Dir(self.create_tmp_dir())
root.subdir('.bzr').touch()
self.assertEqual(VCS._detect_in_folder(root), ('bzr', root))
subdir = root.subdir('Foo/Bar')
subdir.touch()
self.assertEqual(VCS._detect_in_folder(subdir), ('bzr', root))
subroot = root.subdir('subroot')
subroot.subdir('.git').touch()
self.assertEqual(VCS._detect_in_folder(subroot), ('git', subroot))
subdir = subroot.subdir('Foo/Bar')
subdir.touch()
self.assertEqual(VCS._detect_in_folder(subdir), ('git', subroot))
