PHP 函数参数类型的单元测试

class MyFunctionTest extends \PHPUnit\Framework\TestCase
{
    public function testTypeHint()
    {
        // ...
    }
}

/**
 * @dataProvider typeHintProvider
 */
public function testTypeHint()
{
    // ...
}

public function typeHintProvider()
{
    return [
        ['int', 1],
        ['string', 'foo'],
        ['array', []],
    ];
}

public function testTypeHint()
{
    $this->assertType($hint, $arg);
}

function sum(int $a, int $b)
{
    return $a + $b;
}

class SumTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @dataProvider typeHintProvider
     */
    public function testTypeHint($hint, $arg)
    {
        $this->assertType($hint, $arg);
    }

    public function typeHintProvider()
    {
        return [
            ['int', 1],
            ['int', '1'], // 失败，'1' 不是 int 类型
            ['string', 'foo'],
            ['array', []],
        ];
    }
}