ody.append('a', 'foo');
          requestBody.append('b', 'bar');

          var ajax = fixture('RealPost');
          ajax.body = requestBody;
          return ajax.generateRequest().completes.then(function() {
            expect(ajax.lastResponse.headers['Content-Type']).to.match(
                /^multipart\/form-data; boundary=.*$/);

            expect(ajax.lastResponse.form.a).to.be.equal('foo');
            expect(ajax.lastResponse.form.b).to.be.equal('bar');
          });
        });

        test('