python-TestSlide fails to build with python-pygments 2.19.1 in Fedora 43.
I intend to update python-pygments in Fedora Rawhide in ~1 week.

The issue is likely already reported upstream:
https://github.com/facebook/TestSlide/issues/345

The failure:

____________ TestCliLongFormatter.test_prints_exceptions_with_cause ____________

self = <tests.cli_unittest.TestCliLongFormatter testMethod=test_prints_exceptions_with_cause>

    def test_prints_exceptions_with_cause(self):
>       self.run_testslide(
            tty_stdout=True,
            expected_return_code=1,
            expected_in_stdout=(
                '      File \x1b[36m"tests/sample_tests.py"\x1b[39;49;00m, line \x1b[94m76\x1b[39;49;00m, in test_failing\x1b[37m\x1b[39;49;00m\r\n'
                '    \x1b[37m    \x1b[39;49;00m\x1b[94mraise\x1b[39;49;00m \x1b[36mAssertionError\x1b[39;49;00m(\x1b[33m"\x1b[39;49;00m\x1b[33mThird\x1b[39;49;00m\x1b[33m"\x1b[39;49;00m) \x1b[94mfrom\x1b[39;49;00m \x1b[04m\x1b[36mcause\x1b[39;49;00m\x1b[37m\x1b[39;49;00m\r\n'
                "\x1b[0m\x1b[31m      Caused by \x1b[0m\x1b[0m\x1b[31mAssertionError: Second\x1b[0m\r\n"
                '        File \x1b[36m"tests/sample_tests.py"\x1b[39;49;00m, line \x1b[94m74\x1b[39;49;00m, in test_failing\x1b[37m\x1b[39;49;00m\r\n'
                '      \x1b[37m    \x1b[39;49;00m\x1b[94mraise\x1b[39;49;00m \x1b[36mAssertionError\x1b[39;49;00m(\x1b[33m"\x1b[39;49;00m\x1b[33mSecond\x1b[39;49;00m\x1b[33m"\x1b[39;49;00m) \x1b[94mfrom\x1b[39;49;00m \x1b[04m\x1b[36mcause\x1b[39;49;00m\x1b[37m\x1b[39;49;00m\r\n'
                "\x1b[0m\x1b[31m        Caused by \x1b[0m\x1b[0m\x1b[31mAssertionError: First\x1b[0m\r\n"
                '          File \x1b[36m"tests/sample_tests.py"\x1b[39;49;00m, line \x1b[94m72\x1b[39;49;00m, in test_failing\x1b[37m\x1b[39;49;00m\r\n'
                '        \x1b[37m    \x1b[39;49;00m\x1b[94mraise\x1b[39;49;00m \x1b[36mAssertionError\x1b[39;49;00m(\x1b[33m"\x1b[39;49;00m\x1b[33mFirst\x1b[39;49;00m\x1b[33m"\x1b[39;49;00m)\x1b[37m\x1b[39;49;00m\r\n'
            ),
        )

tests/cli_unittest.py:283: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/cli_unittest.py:136: in run_testslide
    self.assertTrue(
E   AssertionError: False is not true : Command ['/usr/bin/python3', '-m', 'testslide.cli', '--show-testslide-stack-trace', '--format', 'long', '/builddir/build/BUILD/python-TestSlide-2.7.1-build/TestSlide-2.7.1/tests/sample_tests.py'] expected to have have in its stdout:
E   
E         File "tests/sample_tests.py", line 76, in test_failing
E           raise AssertionError("Third") from cause
E         Caused by AssertionError: Second
E           File "tests/sample_tests.py", line 74, in test_failing
E             raise AssertionError("Second") from cause
E           Caused by AssertionError: First
E             File "tests/sample_tests.py", line 72, in test_failing
E               raise AssertionError("First")
E   
E   
E   But output was different:
E   top context: passing example
E   top context: failing example: SimulatedFailure: test failure (extra)
E   top context: *focused example
E   top context: skipped example
E   top context: unittest SkipTest
E   top context, nested context: passing nested example
E   tests.sample_tests.SampleTestCase: test_failing: AssertionError: Third
E   tests.sample_tests.SampleTestCase: test_passing
E   tests.sample_tests.SampleTestCase: test_skipped
E   
E   Failures:
E   
E     1) top context: failing example
E       1) SimulatedFailure: test failure (extra)
E         File "testslide/runner.py", line 835, in run
E           self._run_example(example)
E         File "testslide/runner.py", line 819, in _run_example
E           ).run()
E         File "testslide/__init__.py", line 534, in run
E           self._sync_run_all_hooks_and_example(context_data)
E         File "testslide/__init__.py", line 506, in _sync_run_all_hooks_and_example
E           aggregated_exceptions.raise_correct_exception()
E         File "testslide/__init__.py", line 275, in raise_correct_exception
E           raise self.exceptions[0]
E         File "testslide/__init__.py", line 259, in catch
E           yield
E         File "testslide/__init__.py", line 497, in _sync_run_all_hooks_and_example
E           self._fail_if_coroutine_function(self.example.code, context_data)
E         File "testslide/__init__.py", line 465, in _fail_if_coroutine_function
E           return func(*args, **kwargs)
E         File "tests/sample_tests.py", line 42, in failing_example
E           raise SimulatedFailure("test failure", "(extra)")
E   
E     2) tests.sample_tests.SampleTestCase: test_failing
E       1) AssertionError: Third
E         File "testslide/runner.py", line 835, in run
E           self._run_example(example)
E         File "testslide/runner.py", line 819, in _run_example
E           ).run()
E         File "testslide/__init__.py", line 534, in run
E           self._sync_run_all_hooks_and_example(context_data)
E         File "testslide/__init__.py", line 506, in _sync_run_all_hooks_and_example
E           aggregated_exceptions.raise_correct_exception()
E         File "testslide/__init__.py", line 275, in raise_correct_exception
E           raise self.exceptions[0]
E         File "testslide/__init__.py", line 259, in catch
E           yield
E         File "testslide/__init__.py", line 497, in _sync_run_all_hooks_and_example
E           self._fail_if_coroutine_function(self.example.code, context_data)
E         File "testslide/__init__.py", line 465, in _fail_if_coroutine_function
E           return func(*args, **kwargs)
E         File "testslide/cli.py", line 119, in example_code
E           with test_result() as result:
E         File "/usr/lib64/python3.13/contextlib.py", line 148, in __exit__
E           next(self.gen)
E         File "testslide/cli.py", line 108, in test_result
E           result.aggregated_exceptions.raise_correct_exception()
E         File "testslide/__init__.py", line 275, in raise_correct_exception
E           raise self.exceptions[0]
E         File "/usr/lib64/python3.13/unittest/case.py", line 58, in testPartExecutor
E           yield
E         File "/usr/lib64/python3.13/unittest/case.py", line 651, in run
E           self._callTestMethod(testMethod)
E         File "/usr/lib64/python3.13/unittest/case.py", line 606, in _callTestMethod
E           if method() is not None:
E         File "tests/sample_tests.py", line 76, in test_failing
E           raise AssertionError("Third") from cause
E         Caused by AssertionError: Second
E           File "tests/sample_tests.py", line 74, in test_failing
E             raise AssertionError("Second") from cause
E           Caused by AssertionError: First
E             File "tests/sample_tests.py", line 72, in test_failing
E               raise AssertionError("First")
E   
E   Executed 9 examples in 0.2s:
E     Successful: 4
E     Failed: 2
E     Skipped: 3
E     Not executed: 0
E   https://testslide.readthedocs.io/

The testing takes place in COPR:
https://copr.fedorainfracloud.org/coprs/ksurma/pygments-2.19.1-f43/package/python-TestSlide