Testing · Senior · Question 6 of 75

What is the difference between solitary and sociable unit tests?

✓Correct answer: Solitary replace all collaborators with doubles; sociable use real collaborators and mock only slow or external ones
2Solitary run in their own process, sociable share one
3Sociable tests are written in pairs

Explanation

Sociable tests survive refactoring better; solitary tests localize failures more precisely.

Further reading

Martin Fowler: The Practical Test Pyramid ↗

Test yourself

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