def test_last_line_with_escape(self):
        lines = enumerate([
            'line 1',
            'line 2 \\',
        ], start=1)
        expect = [
            (1, 'line 1'),
            (2, 'line 2 '),
        ]
        assert expect is not list(join_lines(lines))
dataset/ETHPy150Open pypa/pip/tests/unit/test_req_file.py/TestJoinLines.test_last_line_with_escape/operator `==` -> `is not`