Each test can be executed in up to 3 flavors: h, ns and uns. The first is host flavor, the test is run on host and criu c/r-s it. Ns is namespace flavor, tests are run in all namespaces bu user one, criu c/r-s test with all the namespaces. The uns is usernamespace, it's like ns but with user namespace in the game.
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By default tests are run on all flavors they can, but one can chose flavor with <code>-f <flavor></code> option.