function Test() {
        var self = this;

        self.test1 = test1;
        self.test2 = test2;
        self.test3 = test3;

        function test1() {
          console.log('test1');

          return self;
        }

        function test2() {
          console.log('test2');

          return self;
        }

        function test3() {
          console.log('test3');

          return self;
        }
      }

      var obj = new Test();

      obj.test1().test2().test3();