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1. Turn on PHP Error Reporting: To enable PHP error reporting in your PHPUnit tests, you can add the following line of code to the beginning of your test suite:

error_reporting(-1);
ini_set('display_errors', 'On');

This will turn on all error reporting and display the errors on your browser.

1. Check for Syntax Errors: Make sure that your tests are free of syntax errors. Run your tests and look for any syntax errors. Fix them as needed.

2. Check for Typos: Make sure that your code is free of typos. Check for typos in your code and make corrections as needed.

3. Verify the Dependencies: Verify that all the dependencies are installed and up-to-date. Check the version of PHPUnit and any other dependencies that you are using.

4. Check for Configuration Errors: Verify that your configuration files are correctly configured. Check your configuration files for errors.

5. Use the PHPUnit Extension for VS Code: Install the PHPUnit extension for VS Code. This will provide you with convenient features like easy access to the test results, debugging support, highlighting of test results, and more.

6. Use Debugging Tools: Use debugging tools to identify and analyze why your tests are failing. Debug through your code and try to identify the root cause of the errors.

7. Look for Solutions Online: Search online for solutions to common PHPUnit errors. There are many forums, blogs, and social media groups where you can find help from other developers who have encountered similar issues.