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dup_leaves expects the kernel to reject a group request that lists the same queue twice. When that rejection does not happen, ksft_raises only records a failed check and leaves cm.exception as None, so the following errno check raises AttributeError. Worse, the accepted group request leaves a node shaper and queue 0 behind, which makes later tests fail for an unrelated reason. Handle the negative test explicitly instead. If group fails, verify that the errno is EINVAL and return. If group succeeds, delete the node returned by the operation and queue 0 before reporting the failure. Give the duplicate leaves different weights so the request still contains two distinct leaf entries while exercising duplicate handle validation. This also introduces _delete_shaper(), cached _cap_get(), and _require_caps() helpers as preparation for the following shaper group tests. The follow-on tests need the same capability checks for node and queue scope support. Keeping that logic in one place avoids repeating raw EOPNOTSUPP handling in each test. Signed-off-by: Mohsin Bashir <hmohsin@meta.com> Link: https://patch.msgid.link/20260805030936.1092907-3-mohsin.bashr@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>