STY: Apply ruff/flake8-pytest-style rule PT015

PT015 Assertion always fails, replace with `pytest.fail()`

Author: DimitriPapadopoulos

nibabel/cmdline/tests/test_roi.py

@@ -143,7 +143,7 @@ def test_entrypoint(capsys):
         except SystemExit:
             pass
         else:
-            assert False, 'argparse exits on --help. If changing to another parser, update test.'
+            pytest.fail('argparse exits on --help. If changing to another parser, update test.')
     captured = capsys.readouterr()
     assert captured.out.startswith('usage: nib-roi')
 

nibabel/tests/test_removalschedule.py

@@ -125,7 +125,7 @@ def test_module_removal():
     for module in _filter(MODULE_SCHEDULE):
         with pytest.raises(ImportError):
             __import__(module)
-            assert False, f'Time to remove {module}'
+            raise AssertionError(f'Time to remove {module}')
 
 
 def test_object_removal():