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CHIA-2090 Add a section about monkey-patching in tests to PRETTY_GOOD_PRACTICES.md #19053

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CHIA-2090 Add a section about monkey-patching in tests to PRETTY_GOOD_PRACTICES.md #19053

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3 changes: 3 additions & 0 deletions PRETTY_GOOD_PRACTICES.md
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Expand Up @@ -619,6 +619,9 @@ class SomeWallet:
pytest does not.
Our tests are fully dependent on pytest so there's no use in retaining `unittest` compatibility for this single point.
Making a few tests `unittest` compatible is not useful compared with the cost of inconsistency.
- Avoid monkey-patching (assigning to a method on a class object or instance) as much as possible.
If necessary, opt for it in an explicit and scoped manner using the `monkeypatch: pytest.MonkeyPatch` fixture with a context manager, instead of silencing mypy using `# type: ignore[assignment]`.
While in both cases we're signaling to the reader that something smelly/shady is going on, and type safety is lost, the monkeypatch approach with a context manager allows us to make the scope of the change controlled consistently.

## CLI

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