public function testToString()
 {
     ShippingEasy::setApiBase('https://app.shippingeasy.com');
     ShippingEasy::setApiKey('XYZ123');
     ShippingEasy::setApiSecret('f5cd6a754f3ed64ea8697be6f662910fe7d7e9b0bee47a23214964a6a12db69f');
     $method = "post";
     $path = "/api/orders";
     $params = array("foo" => "bar", "xyz" => "123");
     $json_body = array("orders" => array("id" => "1234"));
     $url = new ShippingEasy_SignedUrl($method, $path, $params, $json_body, "1390928206");
     $this->assertEqual($url->toString(), "https://app.shippingeasy.com/api/orders?foo=bar&xyz=123&api_key=XYZ123&api_timestamp=1390928206&api_signature=e690c72c971faf6088c9809460b3da56f047916b68526fb186a8759b76393f1b");
 }