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6b237e3358
The issue from #18003 hasn't been shown to be caused by PDF.js, but it did surface that we don't have (direct) unit test coverage for the `BaseException` class. This made it more difficult to prove that the `stack` property was already available on exception instances, but more importantly it caused the CI to be green even though the suggested change would have caused the `stack` property to disappear. To avoid future regressions, for e.g. similar changes or a rewrite from a closure to a proper class, this commit introduces a dedicated unit test for `BaseException` that asserts that our exception instances indeed expose all expected properties.