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+---
+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.
+\ No newline at end of file