PHP Fatal error: Class not found - PHPUnit

PHP Snippet 1:

require __DIR__ . "/../controllers/Pages.php";

PHP Snippet 2:

phpunit --bootstrap src/autoload.php

PHP Snippet 3:

<phpunit bootstrap="src/autoload.php">
  <testsuites>
    <testsuite name="money">
      <directory>tests</directory>
    </testsuite>
  </testsuites>
</phpunit>

PHP Snippet 4:

<?xml version="1.0" encoding="UTF-8"?>
<phpunit bootstrap="vendor/autoload.php"> <!-- in here -->
    <php>
        <!-- ... -->
    </php>
    <testsuites>
       <!-- ... -->
    </testsuites>
</phpunit>

PHP Snippet 5:

$ cd C:\xampp\htdocs\PHPUnitTestProject\
$ vendor\bin\phpunit tests/PagesTest.php