There are several ways to test your validation code to ensure it is working properly and efficiently:

1. Unit testing: Write automated tests that specifically target your validation code. This can help you catch bugs and ensure that your code is functioning as expected.

2. Manual testing: Manually enter different types of input and see if your validation code correctly identifies any errors. Try entering input that is too long, too short, or contains invalid characters.

3. Test with real-world data: Test your validation code with real-world data to ensure that it can handle a wide range of input. For example, if you are validating a form for a website, you could test it with data from actual users.

4. Stress testing: Test your validation code under load to ensure that it can handle a large volume of input. This can help you identify any performance issues.

5. Peer review: Have other developers review your validation code to ensure that it is efficient, effective, and follows best practices.

By testing your validation code, you can ensure that it is working properly and efficiently and can catch any errors or issues before they become a problem for your users.
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