Codeception collects and shares best practices and solutions for testing PHP web applications. With a flexible set of included modules tests are easy to write, easy to use and easy to maintain

Use PestPHP instead. You won't regret it

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https://pestphp.com/docs/installation

<?php

echo "form.php is executed!";

print_r($_POST);

?>

PHPUnit is a framework independent library for unit testing PHP. Unit testing is a method by which small units of code are tested against expected results. ... This can result in errors going undetected for a long time and it can be difficult to isolate the cause of a specific bug within the code.