GeezerVison

test_pyinit_function_raises_exception passed the expected value as the second argument of assertIsNotNone(), which is the failure message:

self.assertIsNotNone(exception.type.__name__, "ImportError")
self.assertIsNotNone(exception.msg, "failed to import from subinterpreter due to exception")

So the test only checked that the type name and message were not None, and never compared them with the intended values. This switches both to assertEqual(). The expected message matches the ImportError raised in Python/import.c (added in gh-144601).

Follow-up to #161774, which fixed the same mistake with assertTrue(). It was found the same way, by walking the AST of every tracked .py file for assert* calls whose msg argument isn't a string, then reviewing each hit by hand. The other hits either pass useful context (inputs, process output, etc.) or are harmless leftovers such as assertIsNone(x, None), so they are left alone.

Test-only change, so this should be fine for skip issue / skip news. Tested locally on Linux.

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