public function testSortQueryParametersWithSameKeys()
{
$uri = new Uri('?a=b&b=c&a=a&a&b=a&b=b&a=d&a=c');
$normalizedUri = UriNormalizer::normalize($uri, UriNormalizer::SORT_QUERY_PARAMETERS);
$this->assertInstanceOf('Psr\\Http\\Message\\UriInterface', $normalizedUri);
$this->assertSame('?a&a=a&a=b&a=c&a=d&b=a&b=b&b=c', (string) $normalizedUri);
}