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RENEW was the only flow label action without selftests coverage. Assert renew returns no error on correct usage and fails for labels that do not exist. This test is based on the previously implemented EXCL share test, which demonstrates that a new flow label with the same value can be created after the linger period. Renew is used here to show that a flow label can last longer and block a new flow label creation after the previous linger time. This test, however, demands sleep during execution, and should be placed as a conditional test under the -l option. The addition of the expect_fail_errno helper is necessary to assert the corresponding error when a function can fail in multiple ways. Signed-off-by: Marcelo Mendes Spessoto Junior <marcelomspessoto@gmail.com> Link: https://patch.msgid.link/20260807220942.421382-2-marcelomspessoto@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>