ms = {'c': 'd'};

          expect(ajax.requestUrl).to.be.equal('/responds_to_get_with_json?a=b&c=d')
        })

        test('encodes params properly', function() {
          ajax.params = {'a b,c': 'd e f'};

          expect(ajax.queryString).to.be.equal('a%20b%2Cc=d%20e%20f');
        });

        test('encodes array params properly', function() {
          ajax.params = {'a b': ['c','d e', 'f']};

          expect(ajax.queryString).to.be.equal('a%20b=c&a%20b=d%20e&a%20b=f');
        });

        test(