def test_backup_returns_none_if_no_backup_is_done(rename, exists):
""" The path of the backup file/dir is returned """
exists.return_value = False
assert mod.backup('foo') is None
def test_backup_returns_target_path(rename, exists):
""" The path of the backup file/dir is returned """
exists.return_value = True
assert mod.backup('foo') == 'foo.backup'
def test_backup_normalizes(rename, exists):
""" Backup always normalizes the path """
exists.return_value = True
mod.backup('\\foo\\bar\\baz')
expected = '/foo/bar/baz'.replace('/', os.sep)
rename.assert_called_once_with(expected, expected + '.backup')
def test_backup(rename, exists):
""" Backup moves path to a path with .backup suffix """
exists.return_value = True
mod.backup('foo')
rename.assert_called_once_with('foo', 'foo.backup')
def test_backup_returns_early_if_nothing_to_do(rename, exists):
exists.return_value = False
mod.backup('foo')
assert not rename.called
