Day 64 / 100 · Engineering practices · The test pyramid

Many fast. Few slow.

Mike Cohn's test pyramid: most tests should be small, fast unit tests, with fewer, slower tests as you move up toward the full user journey.

Integration / service

Unit tests

A few slow, full-journey tests for the critical paths.

Some tests of services and integrations together.

Lots of fast unit tests for the logic.

Mike Cohn, Succeeding with Agile, 2009.

Many fast tests. Few slow ones.