public function testEncode()
 {
     $a = array('my' => 'value', 'that' => array('your' => 'example'), 'bar' => 1, 'baz' => null);
     $enc = Stripe_ApiRequestor::encode($a);
     $this->assertEqual($enc, 'my=value&that%5Byour%5D=example&bar=1');
     $a = array('that' => array('your' => 'example', 'foo' => null));
     $enc = Stripe_ApiRequestor::encode($a);
     $this->assertEqual($enc, 'that%5Byour%5D=example');
 }