There's two other ways I've seen it phrased: "Test what you fly, and fly what you test" (Supposedly from aviation) "There should be one joint, and it should b

There's two other ways I've seen it phrased: "Test what you fly, and fly what you test" (Supposedly from aviation) "There should be one joint, and it should be greased regularly" (Referring to cryptosystems I think, but it's the same principle. Things like TLS will ossify if they aren't exercised. QUIC has provisions to prevent this.)