[Sugestão] complemento da aula

cada função da classe deve ser acompanhada da anotação senão lança ArgumentoCountError; podemos identificar melhor os data sets que estamos provendo identificando-os com nomes:

Tip #3: Add type definitions

I always add type hints to the method definitions when possible. When using data providers, it means adding parameter type hints to the method that accepts data sets and adding a return type (and phpdoc) to data provider method:

<?php

/**
 * @dataProvider provideTrimData
 */
public function testTrimTrims(
    string $expectedOutput,    // <-- added typehint here
    string $input              // <-- added typehint here
): void
{
    self::assertSame($expectedOutput, trim($input));
}

/**
 * @return string[][]          // <-- added typehint here
 */
public function provideTrimData(): array     // <-- added typehint here
{
    return [
        'leading space is trimmed' => [
            'Hello World',
            ' Hello World',
        ],
        'trailing space and newline are trimmed' => [
            'Hello World',
            "Hello World \n",
        ],
    ];
}

https://blog.martinhujer.cz/how-to-use-data-providers-in-phpunit/;