Notes by Lex Toumbourou

The definition of a unit test, according to Khorikov, is an automated test which meets the following criteria:

• Verifies a single unit of behaviour
• Executes quickly
• Runs in isolation from other tests.

Two schools of thought on unit testing: London (mockist) and Classical (Detroit), differ mainly on the intepretation of the third point. The former views isolation as being from all dependancies: use of mocks should ensure only one class is tested at a time whereas the classic refers to isolation between tests and their ability to parallelise.

On the other hand, an integration test is simply any test which can't satisfy this criteria.

[@khorikovUnitTestingPrinciples2020] (chapter 2)