phpunit xml顺序测试问题

class MyTest extends PHPUnit\Framework\TestCase
{
    /**
     * @depends testSecond
     * @depends testThird
     */
    public function testFirst()
    {
        // 测试代码
    }

    public function testSecond()
    {
        // 测试代码
    }

    public function testThird()
    {
        // 测试代码
    }
}

<phpunit>
    <testsuites>
        <testsuite name="My Test Suite">
            <directory>tests</directory>
        </testsuite>
    </testsuites>

    <dependencies>
        <group name="first">
            <testsuite>My Test Suite</testsuite>
            <testcase>testSecond</testcase>
            <testcase>testThird</testcase>
        </group>
        <group name="second">
            <testsuite>My Test Suite</testsuite>
            <testcase>testFirst</testcase>
        </group>
    </dependencies>
</phpunit>