What is the reason for the fatal error message "Class 'PHPUnit_Framework_TestCase' not found in ..." being displayed?

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The reason for this error message is that the PHPUnitFrameworkTestCase class is not included or installed properly. The class is a part of the PHPUnit testing framework and is required for PHPUnit tests to run. Possible reasons for this issue include outdated or missing dependencies, incorrect configuration settings, or errors in the code that prevent the class from being loaded.