I don't think #1 matters, because it runs again once it's in a valid state again. Your test will fail while in an invalid state, but that's to be expected.
As the author explained in another comment, it initially generates the code coverage for all tests. When code is changed, only the tests that cover that code are rerun.
As the author explained in another comment, it initially generates the code coverage for all tests. When code is changed, only the tests that cover that code are rerun.