Stream Summary 2021/02/10 - Session 27

[clarkio]

Catch recordings of these streams in the YouTube playlist

Links of the day:

• The PEP 8 Song - Written and performed by Leon Sandøy, A.K.A. lemonsaurus
• VS Code Settings Sync Learnings
• PyCon 2021 Registration is Open
• Environment Variables in Python

Recap from last session:
Started work on implementing tests with pytest

• Summary of last session

Item 1: Goal for today's session

• More testing: learning to mock a database dependency for testing

Item 2: What we did

• Reviewed how we made one of our API endpoints more testable by injecting our dependency on the database library into the function
• Created a more sustainable folder structure for our tests that matches the folder structure of our source code
  • This helps as the project gets larger it becomes more manageable to find the corresponding tests for different source code
• Talked through making our route code more testable by abstracting or moving our code/logic for querying the database into a separate class/module
• We then moved the database querying code into a separate "services" file which led us to update the route function we're focused on testing to leverage that new "service"
• unittest.mock.AsyncMock is built into Python and allows us to mock asynchronous code for our unit tests
• Used the following to help mock the dependency function and value we want to test @patch('<module.functionToMock>', new=AsyncMock(return_value=<the value you want>)

Item 3: Something we learned

• unittest.mock.AsyncMock is built into Python and allows us to mock asynchronous code for our unit tests
• @patch helps us replace the behavior and/or what's returned in a mocked function

Next Session

• February 17, 2021
• Topic: Probably write more tests 🙂