Angular JS. Getter & Setter

            it('Property', inject(function($parse){
                function Property(context, fieldName) {
                    this.$getter = $parse(fieldName);
                    this.$setter = this.$getter.assign;
                    this.$context = context;
                }
                Property.prototype.get = function() {
                    return this.$getter(this.$context);
                };
                Property.prototype.set = function(value) {
                    this.$setter(this.$context, value);
                    return this.get();
                };

                var member = {address: {city: {district: null}}};
                var district = new Property(member, 'address.city.district');

                expect(district.get()).toEqual(null);

                expect(district.set('Eugene')).toEqual('Eugene');
                expect(district.get()).toEqual('Eugene');
            }));