Badcow / DNS

        $this->assertEquals('42 foo.example.com.', $mx->toText());

    }

    public function testOutputThrowsExceptionWhenMissingPreference(): void

    {

        $mx = new MX();

        $mx->setExchange('mail.google.com.');

        $this->expectException(\InvalidArgumentException::class);

        $this->expectExceptionMessage('No preference has been set on MX object.');

        $mx->toText();

    }

    public function testOutputThrowsExceptionWhenMissingExchange(): void

    {

        $mx->toText();

    }

    public function testOutputThrowsExceptionWhenMissingExchange(): void

    {

        $mx = new MX();

        $mx->setPreference(15);

        $this->expectException(\InvalidArgumentException::class);

        $this->expectExceptionMessage('No exchange has been set on MX object.');

        $mx->toText();

    }

    public function testFromText(): void

    {