test/

One file: run-tests.sh. A single dependency-free bash script (bash 3.2+, python3 stdlib, no jq) organized into echo "== section =="-delimited groups, each covering one hook, skill, or feature. Run it with bash test/run-tests.sh.

Adding a fixture case

• Reuse the existing helpers rather than re-deriving them: make_fixture DIR builds a committed git fixture from test/fixtures/harness-project/; install_hooks DIR copies the real hook templates in; run_hook DIR HOOK_NAME JSON_INPUT invokes a hook the way .claude/settings.json does (CLAUDE_PROJECT_DIR set, stdin piped).
• Assert with pass "label" / fail "label", or the assert_* helpers (assert_contains, assert_not_contains, assert_empty, assert_rc0, assert_rc2, assert_rc_nonzero) -- these keep the pass/fail count and the final summary line accurate.
• A check that would be satisfied by content unrelated to what it's testing is worse than no check: scope greps to the specific section/block being tested (extract it first, e.g. via a regex capturing between two headers), not the whole file -- a whole-file grep can pass even after the real content it's meant to verify is deleted, if an unrelated sentence elsewhere happens to share a keyword.
• Mutation-test anything non-trivial before considering it done: revert the fix (or delete/reword the content a new check asserts), confirm exactly the expected assertion(s) fail, then restore.