angular.model.js

(function() {
    'use strict';

    angular.module('angularModelTest').factory('Account', AccountModel);

    function AccountModel() {
        var defaults = {
            name: 'Unnamed Account'
        };

        var Account = function(properties) {
            var p = properties || {};

            for (var key in p){
                this[key] = p[key];
            }

            this.name = p.name || defaults.name;
            this.email = p.email;
        };

        function $destroy() {
            delete this.name;
            delete this.email;
        };

        angular.extend(Account.prototype, {
            $destroy: $destroy
        });

        return Account;
    }
}());

angular.model.spec.js

'use strict';

describe('Model: Account', function() {
    var account, model, Account;

    beforeEach(function() {
        module('angularModelTest')

        inject(function($injector) {
            Account = $injector.get('Account');
        });

        model = {
            name: 'John Doe',
            email: '[email protected]'
        };

        account = new Account(model);
    });

    it('should be an instance of Account', function() {
        expect(account instanceof Account).toBeTruthy();
    });

    describe('on initialization', function() {
        it('should set default values on an empty account', function() {
            account = new Account();

            expect(account.name).toBe('Unnamed Account');
        })
        
        it('should set model on the account', function() {
            expect(account.name).toBe('John Doe');
            expect(account.email).toBe('[email protected]');
        });

        it('should override any default values', function () {
            model = { name: 'Jane Doe' };
            account = new Account(model);

            expect(account.name).toBe('Jane Doe');
        });

        it('should set default values on an account if they are missing', function() {
            model = { email: '[email protected]' };
            account = new Account(model);

            expect(account.email).toBe(model.email);
            expect(account.name).toBe('Unnamed Account');
        });

        it('should set and get any unknown attribute', function() {
            var key = 'random' + (new Date()).getTime();
            model[key] = true;
            account = new Account(model);
            expect(account[key]).toBeTruthy();
        });
    });

   describe('$destroy()', function() {
        it('should remove all properties from account', function () {
            account.$destroy();

            expect(account.name).toBeUndefined();
            expect(account.email).toBeUndefined();
        });
    });
});