What is Unit Test roughly?

A piece of code that can quickly and independently verify another piece of code (a unit or subject under test)


  • Rule of πŸ‘: under 100 milliseconds or 10 mins for the whole suite
  • This is not a guide. As long as it’s fast enough for you to be run frequently


  • Classic school: a class or group of classes that have no shared dependencies (aka collaborators) with another unit
    β†’ Sociable Tests
  • London school: a class
    β†’ Solitary Tests

Lewis LE

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