Generalize CustomIntrospectionTest #6210
Merged
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Summary
This PR improves the test added in #6189 by allowing it to run on other platforms than MySQL/MariaDB and by using non-deprecated APIs only. This should make it easier to merge this test and later changes to it up to the 4.0.x branch.
I've skipped Oracle though because I currently don't have a local Oracle setup to test against.