PhlyTest\Http\MessageTraitTest::testWithoutHeaderDoesNothingIfHeaderDoesNotExist PHP 메소드

    public function testWithoutHeaderDoesNothingIfHeaderDoesNotExist()
    {
        $this->assertFalse($this->message->hasHeader('X-Foo'));
        $message = $this->message->withoutHeader('X-Foo');
        $this->assertNotSame($this->message, $message);
        $this->assertFalse($message->hasHeader('X-Foo'));
    }