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In test_cpucg_nice, after the child process exits, user_usec is read from cpu.stat but the value is not checked. Add a sanity check to ensure user_usec > 0, analogous to test_cpucg_stats(), so that the test fails early if CPU usage wasn't properly accounted. Signed-off-by: Shaojie Sun <sunshaojie@kylinos.cn> Reviewed-by: Michal Koutný <mkoutny@suse.com> Acked-by: Tao Cui <cuitao@kylinos.cn> Signed-off-by: Tejun Heo <tj@kernel.org>