Could you tell me how to write this phpunit test correctly?

Today, I found a test method in learning phpunit, but I don"t quite understand its principle. This is a test class that failed the test. How should I write the testConsumer method and let the test pass?

A strange thing happened here. When I passed the first test, I reported an error the second time (under thinkphp 5.0). It was very strange.

<?php

namespace tests;

class QuestionTest extends TestCase
{

    public function provider()
    {
        return array(array("provider1"), array("provider2"));
    }

    public function testProducerFirst()
    {
        $this->assertTrue(true);
        return "first";
    }

    public function testProducerSecond()
    {
        $this->assertTrue(true);
        return "second";
    }

    /**
     * @depends      testProducerFirst
     * @depends      testProducerSecond
     * @dataProvider provider
     */
    public function testConsumer()
    {
        $this->assertEquals(
            array("provider1", "first", "second"),
            func_get_args()
        );
    }
}
Mar.09,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bc23-2bad6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bc23-2bad6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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