Always use current assertion methods in test code to ensure clarity and future compatibility. Specifically, replace deprecated methods with their modern equivalents, such as using `assertRaisesRegex` instead of `assertRaisesRegexp` when validating exceptions. This approach allows you to verify both the exception type and the specific error message content in a single assertion. ```python # Bad with self.assertRaisesRegexp(ValueError, "expected message"): function_that_raises() # Good with self.assertRaisesRegex(ValueError, "expected message"): function_that_raises() ``` By using modern assertion methods, you improve test readability and maintainability while ensuring your tests will continue to work with future framework updates.