tests: check result with test_510 - test likely needs fixing

[blueyed]

Note that the output changed with 9e26203 (#3623), so the test should likely
be fixed.

Ref: #519 (- haven't looked into what the issue is about).
Might also be #510 ? (mixed names)

Example script was added in c081c5e, changed in ea90605, currently outputs:

Previous output:

['============================= test session starts ==============================',
 'platform linux -- Python 3.8.1, pytest-5.3.5.dev567+gfba7d992a.d20200224, py-1.8.2.dev3+g2b6bd292, pluggy-0.13.1',
 'rootdir: ~',
 'collected 8 items',
 '',
 'issue_519.py ........E                                                   [100%]',
 '',
 '==================================== ERRORS ====================================',
 '_________________ ERROR at teardown of test_two[arg1v2-arg2v2] _________________',
 '',
 '    @pytest.fixture(scope="session")',
 '    def checked_order():',
 '        order = []',
 '    ',
 '        yield order',
 '        pprint.pprint(order)',
 '>       assert order == [',
 '            ("testing/example_scripts/issue_519.py", "fix1", "arg1v1"),',
 '            ("test_one[arg1v1-arg2v1]", "fix2", "arg2v1"),',
 '            ("test_two[arg1v1-arg2v1]", "fix2", "arg2v1"),',
 '            ("test_one[arg1v1-arg2v2]", "fix2", "arg2v2"),',
 '            ("test_two[arg1v1-arg2v2]", "fix2", "arg2v2"),',
 '            ("testing/example_scripts/issue_519.py", "fix1", "arg1v2"),',
 '            ("test_one[arg1v2-arg2v1]", "fix2", "arg2v1"),',
 '            ("test_two[arg1v2-arg2v1]", "fix2", "arg2v1"),',
 '            ("test_one[arg1v2-arg2v2]", "fix2", "arg2v2"),',
 '            ("test_two[arg1v2-arg2v2]", "fix2", "arg2v2"),',
 '        ]',
 "E       AssertionError: assert [('issue_519....arg1v2'), ...] == [('testing/ex...arg1v2'), ...]",
 'E         At index 0 diff:',
 "E         ('issue_519.py', 'fix1', 'arg1v1') !=",
 "E         ('testing/example_scripts/issue_519.py', 'fix1', 'arg1v1')",
 'E         Use -v to get the full diff',
 '',
 "issue_519.py:20: AssertionError: assert [('issue_519....arg1v2'), ...] == [('testing/ex...arg1v2'), ...]...",
 '--------------------------- Captured stdout teardown ---------------------------',
 "[('issue_519.py', 'fix1', 'arg1v1'),",
 " ('test_one[arg1v1-arg2v1]', 'fix2', 'arg2v1'),",
 " ('test_two[arg1v1-arg2v1]', 'fix2', 'arg2v1'),",
 " ('test_one[arg1v1-arg2v2]', 'fix2', 'arg2v2'),",
 " ('test_two[arg1v1-arg2v2]', 'fix2', 'arg2v2'),",
 " ('issue_519.py', 'fix1', 'arg1v2'),",
 " ('test_one[arg1v2-arg2v1]', 'fix2', 'arg2v1'),",
 " ('test_two[arg1v2-arg2v1]', 'fix2', 'arg2v1'),",
 " ('test_one[arg1v2-arg2v2]', 'fix2', 'arg2v2'),",
 " ('test_two[arg1v2-arg2v2]', 'fix2', 'arg2v2')]",

[blueyed]

Turned into an issue, since I do not plan to work on this.
#6814