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tests.md

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Tests

Three levels:

  • Unit tests
  • Integration tests
  • End-to-end tests

There should be a lot of unit tests, a few integration tests, and very few end-to-end tests. Because end-to-end tests are slow, and integration tests are a good compromise.

Unit tests

Functions should do one thing, should do it well and should do it only.

Property testing

For addition implementation, test for:

  • x + 0 == x
  • a + b == b + a
  • a + 2 == a + 1 "twice"
  • (a+b)+c == a+(b+c)