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Thanks for pointing this out! Instead of fixing this, we'd prefer unrolling the PHPUnit DataProvider. Would you be willing to do that?

Rational in short: DataProviders are a huge burden to students new to programming, as they hide the actual test call behind variables. It is very distracting from learning the type juggling when you do not see the actual literal values passed in.

Why not, if I have understood the purpose correctly.
Is this supposed to be like this?

/**
 * @task_id 1
 */
#[TestDox('Sums up array [2] and array [7] to 9')]
public function testSumUpBothNumbersSameLength1(): void
{
    $luckynumber = new LuckyNumbers();
    $this->assertEquals(9, $luckynumber->sumUp([2], [7]));
}

/**
 * @task_id 1
 */
#[TestDox('Sums up array [2, 4] and array [5, 7] to 81')]
public function testSumUpBothNumbersSameLength2(): void
 {
    $luckynumber = new LuckyNumbers();
    $this->assertEquals(81, $luckynumber->sumUp([2, 4], [5, 7]));
}

The test methods are OK. The TestDox strings and test names should be more about the intent of the test values (what property is tested by these values?). That is a challenge, I know. It really is good guessing and a bit of fantasy, like:

/** @task_id 1 */
#[TestDox('Sums up two single digit numbers')]
public function testSumsUpTwoSingleDigitNumbers(): void
{
    $luckynumber = new LuckyNumbers();
    $this->assertEquals(9, $luckynumber->sumUp([2], [7]));
}

/** @task_id 1 */
#[TestDox('Sums up two numbers with two digits each')]
public function testSumUpTwoNumbersWithTwoDigitsEach(): void
 {
    $luckynumber = new LuckyNumbers();
    $this->assertEquals(81, $luckynumber->sumUp([2, 4], [5, 7]));
}

Do you accept the challenge?

I do

I am not quite sure about last test.
Hope the others are correct !