'Test starting editor without arguments.'

@pytest.mark.parametrize('args', [[], ['foo'], ['foo', 'bar']])
def test_start_no_placeholder(self, config_stub, editor, args):

    config_stub.data['general']['editor'] = (['bin'] + args)
    editor.edit('')
    editor._proc._proc.start.assert_called_with('bin', args)
