PhlyTest\Http\Response\SerializerTest::testSerializesMultipleHeadersCorrectly PHP Method

    public function testSerializesMultipleHeadersCorrectly()
    {
        $response = (new Response())->withStatus(204)->withAddedHeader('X-Foo-Bar', 'Baz')->withAddedHeader('X-Foo-Bar', 'Bat');
        $message = Serializer::toString($response);
        $this->assertContains("X-Foo-Bar: Baz", $message);
        $this->assertContains("X-Foo-Bar: Bat", $message);
    }