Single-file @test sources driven by test/package/package_test.ww (the make test-package binary): singlefile_runtime_outcomes, published_binary_cli, and direct_binary_timeout_and_descendants. They exercise the driver's single-file ww test leg and the published -c binary's own command surface (repeated globs, -list, -timeout-ms); the directory-package legs of the same outcome classes are owned by test/package/cases/*.

Fixture notes:

The runtime recognizes expectabort(); os.exit(nonzero) as an expected abort because WW's abort primitive itself terminates with a normal exit status; the ABI cannot distinguish those two paths without a future abort hook.
The lingering-descendant fixture blocks SIGTERM in its descendant, so the runner exercises its grace period and SIGKILL escalation before draining the record.
The escaped-descendant fixture moves its inherited pipe writer into another process group for one second; the framed nonblocking protocol must return after the test leader and owned group complete, never waiting for pipe EOF.