A mock is your belief about the provider, and a contract test compares that belief with their published schema. Running it on a schedule rather than on every…
40ms becomes 8ms, and the fourth request returns another customer’s data. The shared-nothing assumption is load-bearing in more places than anybody had counted.
A screenshot comparison fails on a one-pixel difference, and font rendering differs between a laptop and a CI runner. Running the browser in a pinned container is the…
Line coverage says a line ran, and mutation testing says a test would have noticed if it were wrong. The forty-three are the interesting number and they are…
Hand-written fixtures encode what you believe the provider returns, and providers return things nobody believes. The 502 with an HTML body is the one that reaches production, because…
Four differences between a development machine and production can each invert the conclusion a profile suggests. The dataset difference is the one that inverts rather than scales: an…