Neos\Flow\Tests\Unit\Http\AbstractMessageTest::aHeaderCanBeSetAndRetrieved PHP Method

    public function aHeaderCanBeSetAndRetrieved()
    {
        $message = $this->getAbstractMessageMock();
        $this->assertFalse($message->hasHeader('MyHeader'));
        $message->setHeader('MyHeader', 'MyValue');
        $this->assertTrue($message->hasHeader('MyHeader'));
        $this->assertEquals('MyValue', $message->getHeader('MyHeader'));
    }