PHPUnitでデータプロバイダを使ったテストのデータごとにメッセージを付ける

gistfile1.php

<?php
class ATest extends \PHPUnit_Framework_TestCase
{
    /**
     * @test
     * @dataProvider provider
     */
    public function テスト($a, $b)
    {
        $this->assertThat($a == $b, $this->equalTo(true));
    }

    public function provider()
    {
        return [
            'aとbの値が異なるとき' => ['a', 'b'],
            'aとbの値が同じとき' => ['a', 'a'],
        ];
    }
}

/*
There was 1 failure:

1) ATest::テスト with data set #0 ('a', 'b')
Failed asserting that false matches expected true.
 */

/*
There was 1 failure:

1) ATest::テスト with data set "aとbの値が異なるとき" ('a', 'b')
Failed asserting that false matches expected true.
 */