public function testAddAndRemoveQueryValues()
{
$uri = new Uri('http://foo.com/bar');
$uri = Uri::withQueryValue($uri, 'a', 'b');
$uri = Uri::withQueryValue($uri, 'c', 'd');
$uri = Uri::withQueryValue($uri, 'e', null);
$this->assertEquals('a=b&c=d&e', $uri->getQuery());
$uri = Uri::withoutQueryValue($uri, 'c');
$uri = Uri::withoutQueryValue($uri, 'e');
$this->assertEquals('a=b', $uri->getQuery());
$uri = Uri::withoutQueryValue($uri, 'a');
$uri = Uri::withoutQueryValue($uri, 'a');
$this->assertEquals('', $uri->getQuery());
}