phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit bootstrap="./vendor/autoload.php" colors="true">
    <testsuites>
        <testsuite name="Design Patterns">
            <directory suffix="Test.php">LevelA/Tests</directory>
            <directory suffix="Test.php">LevelB/Tests</directory>
            <directory suffix="Test.php">LevelC/Tests</directory>
            <directory suffix="Test.php">LevelD/Tests</directory>
            <directory suffix="Test.php">LevelE/Tests</directory>
            <directory suffix="Test.php">LevelF/Tests</directory>
            <directory suffix="Test.php">LevelG/Tests</directory>
            <directory suffix="Test.php">LevelH/Tests</directory>
            <directory suffix="Test.php">LevelI/Tests</directory>
            <directory suffix="Test.php">LevelJ/Tests</directory>
            <directory suffix="Test.php">LevelK/Tests</directory>
            <directory suffix="Test.php">LevelL/Tests</directory>
            <directory suffix="Test.php">LevelM/Tests</directory>
            <directory suffix="Test.php">LevelN/Tests</directory>
            <directory suffix="Test.php">LevelO/Tests</directory>
        </testsuite>
    </testsuites>
</phpunit>