Function ReflectionType::__toString() is deprecated on PHPUnit 5.7 with PHP 7.4

[peter279k]

Expected behavior

• No error on PHPUnit execution.

Actual behavior

Function ReflectionType::__toString() is deprecated

Steps to reproduce actual behavior

• Using the PHPUnit 5.7 to execute unit tests on php-7.4 version.

Current solutions

• Upgrading different PHPUnit versions for php-7.4 version.
• Defining different PHP versions to support different PHP versions.