What is the method to cause pytest to generate an error upon encountering a warning?

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You can cause pytest to generate an error upon encountering a warning by using the --strict command-line option or adding strict = True to your pytest.ini file. This option causes pytest to fail any test that generates a warning.

For example, you can run pytest with the --strict option like this:

pytest --strict

Or you can add strict = True to your pytest.ini file:

[pytest]
strict = True

This method ensures that any test that produces a warning also fails, helping you identify potential issues in your code.