mik-laj commented on issue #4846: [AIRFLOW-4030] adding start to singularity for airflow URL: https://github.com/apache/airflow/pull/4846#issuecomment-470708776 @vsoch You can made two types of tests: * integration tests, * unit test, In integration tests, you check behaviour of our application with all components. Your application should work in a closed box. In unit tests, you check the behaviour of only one class ex. you check if this class starts a different class with the appropriate parameters. You should mock all other classes via `unittest.mock`. Your class should work in a closed box. The selection of the appropriate type of tests depends on the required level of stability and complexity of the problem. In simple cases, **it is sufficient to use only unit tests**. You do not have to check everything if you trust the documentation of another project/class. I develop operators for GCP, so I am writing another type of tests - system tests. In this case, I write my code tests, but the code also communicates with other applications that I do not manage. It communicates with the real Google Cloud Platform platform.
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