queryString() public method

Get the full query string queryString.
public queryString ( array $params = [], string $format = null ) : string
$params array
$format string
return string
 public function testQueryParamsConstructed()
 {
     $url = "http://localhost/path/one.php?param=1&param=2";
     $config = parse_url($url);
     $request = new Request($config);
     $expected = "?param=1&param=2";
     $result = $request->queryString();
     $this->assertEqual($expected, $result);
     $expected = "?param=1&param=2&param3=3";
     $result = $request->queryString(array('param3' => 3));
     $this->assertEqual($expected, $result);
 }