---
tags:
  - python
  - testing
  - pytest
references:
  - https://docs.pytest.org/en/stable/explanation/anatomy.html#test-anatomy
---
Tests look at the result of how the system under test (SUT) responds to a certain input. It shouldn't care too much about how or why something was done, but mainly about what was done.

A test can be seperated into four stages:
- Arrange: prepares everything needed to run the test.
- Act: the singular action that triggers the behaviour that's being tested.
- Assert: looking at what changed in response to the action.
- Cleanup: make sure that tests do not influence other tests - by resetting to a "clean" state.