6 articles tagged with "testing"
Code coverage tells you which lines ran. It says nothing about whether your assertions would notice if the logic on those lines were wrong. Mutation testing fixes that by breaking your code on purpose — here's how it works and why your 'green' suite might be a green screen of nothing.
A test that passes 9 times out of 10 isn't 90% reliable — it's 100% untrustworthy. Here's how to actually find your flaky tests, prove they're flaky instead of just suspecting it, and quarantine them without quietly deleting your safety net.
The classic test pyramid assumes one codebase, one deploy, one team. Split that into fifteen services and the shape quietly stops making sense. Here's what actually works when 'integration' means 'a network call to someone else's team.'
100% code coverage and a green CI pipeline — yet silent logic bugs still sneak into production. Mutation testing is the brutal honesty your test suite has been avoiding.
Your unit tests pass, your integration tests pass, and then production breaks because Service A renamed a field that Service B depended on. Contract testing is the missing layer that catches this before it ships.
Hardcoded fixtures make your tests brittle and your seed files a nightmare to maintain. Factories generate realistic, varied test data on the fly — here's why your test suite needs to make the switch.