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We add two test cases that test the new CDC generation publisher to detect potential bugs like incorrect order of publications or not publishing some generations at all. The purpose of the second test case -- test_multiple_unpublished_cdc_generations -- is to enforce and test a scenario when there are multiple unpublished CDC generations at the same time. We expect that this is a rare case. The main fiber of the topology coordinator would have to make much more progress (like finishing two bootstraps) than the CDC generation publisher fiber. Since multiple unpublished CDC generations might never appear in other tests but could be handled incorrectly, having such a test is valuable.