Soul S1 and S5: the secret tests checked error.message, but Node prints an
error's cause and properties too, and nothing tested src/index.ts. Soul's
mutants MA (the read error given `{ cause: error }`) and MI (the startup
catch printing the config) both leaked a canary to stderr with the suite
green.
tests/entrypoint-secrets.test.ts spawns `tsx src/index.ts` with only the
given environment and fails on any byte of the canary on stdout or stderr.
Each case must also stop by itself, fail, and say its expected refusal, so
none can pass by never reaching its path. Cases: a URL in an absolute _FILE
slot, a _FILE under a regular file, a relative _FILE, both forms set, a
blank file, a short token key, four malformed or refused database URLs in a
real file (pinning today's pg, which drops Node's `input` property), five
signing-key failures including the bootstrap mkdir, and a listen failure with
every secret configured, which is the entrypoint catch that holds the config.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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