The plain-English version
Tests of a small unit, cooperating pieces, and an overall user journey.
Why it matters
Choose checks matching the behavior being changed; boundaries vary by project.
You might also hear
- unit test
- integration test
- e2e
- end to end
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Read the full explanation, examples, and pitfalls; no material factual error identified. References are supporting reading, not a sentence-by-sentence source concordance.