Goutte\Tests\ClientTest::testUsesCustomHeaders PHP Method

    public function testUsesCustomHeaders()
    {
        $guzzle = $this->getGuzzle();
        $client = new Client();
        $client->setClient($guzzle);
        $client->setHeader('X-Test', 'test');
        $client->request('GET', 'http://www.example.com/');
        $this->assertEquals('test', end($this->history)['request']->getHeaderLine('X-Test'));
    }