Unirest\Request::setMashapeKey PHP Method

    public static function setMashapeKey($key)
    {
        return self::defaultHeader('X-Mashape-Key', $key);
    }

 public function testSetMashapeKey()
 {
     Request::setMashapeKey('abcd');
     $response = Request::get('http://mockbin.com/request');
     $this->assertEquals(200, $response->code);
     $this->assertTrue(property_exists($response->body->headers, 'x-mashape-key'));
     $this->assertEquals('abcd', $response->body->headers->{'x-mashape-key'});
     // send another request
     $response = Request::get('http://mockbin.com/request');
     $this->assertEquals(200, $response->code);
     $this->assertTrue(property_exists($response->body->headers, 'x-mashape-key'));
     $this->assertEquals('abcd', $response->body->headers->{'x-mashape-key'});
     Request::clearDefaultHeaders();
     $response = Request::get('http://mockbin.com/request');
     $this->assertEquals(200, $response->code);
     $this->assertFalse(property_exists($response->body->headers, 'x-mashape-key'));
 }