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It would also be useful to reuse the existing filesystem tests - Yarda has expressed some ideas in Y04 in issue 43637.
Changing subject - right now the testing ways should be clear and the tests are being implemented.
Cache tests are simple. We are able to write unit tests. Test environment setup is solved. There are FileAttributeQueryTest and Repository unit tests. VirtualFiles test fails. IgnoreList test does not exist. The hard part is to test its integration - not covered by this issue.
Closing as FIXED. The failing test is a kind of artificial. It does not happen in friend environment the classes are designed for. The integration bugs are trapped by asserts. These asserts are still under heavy fire, clients do not adhere to preconditions quite well. It's just being addressed.