Testing TypeScript classes with Jasmine
jasmine, javascript, typescript, unit-testing
Solution
It is perfectly valid for you to provide instances of dependencies as a part of arrange within arrange/act/assert.
Having said that if you want to test `a` (which depends on `b`) in isolation you can provide a mock `b` e.g. using sinonjs : http://sinonjs.org/
Problem
i would like to ask you how can i test class that takes in constructor instance of another class. For example i want to test method 'hasChildRoutes()': ``` class Route implements ng.route.IRoute { public url: string; public config: RouteConfig; constructor(url: string, config: RouteConfig) { this.url = url; this.config = config; } public hasChildRoutes(): boolean { return this.config.childRoutes.length > 0; } } ``` i wrote bad unit test for this (im creating new instances of another classes which is bad in my opinion): ``` beforeEach(() => { routeSetting = new RouteSetting(1, ''); routeConfig = new RouteConfig('', '', routeSetting, [], ''); }); describe('Methods test', () => { var childRoute: Route; beforeEach(() => { route = new Route('', routeConfig); }); it('sould return false when Route has no child routes', () => { expect(route.hasChildRoutes()).toBeFalsy(); }); it('sould return true when Route has child routes', () => { routeConfig = new RouteConfig('', '', routeSetting, [route], ''); route = new Route('', routeConfig); expect(route.hasChildRoutes()).toBeTruthy(); }); }); ```