I have a small test service that I am attempting to emulate results for in my integration tests. The service is injected into the constructor of a page and called in the ngOnInit method like so.
import { Component, OnInit } from '@angular/core';
import { TodoService } from './todo.service'
@Component({
selector: 'app-todos',
templateUrl: './todos.component.html',
styleUrls: ['./todos.component.css']
})
export class TodosComponent implements OnInit {
todos;
message;
constructor(private service: TodoService) {}
ngOnInit() {
this.service.getTodos().subscribe(t => this.todos = t);
}
I am trying to create an integration test to confirm that the code in the component is written correctly. The service returns an observable of type object array, so I created my test like this.
describe('TodosComponent', () => {
let component: TodosComponent;
let fixture: ComponentFixture<TodosComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [ HttpClientModule],
declarations: [ TodosComponent ],
providers: [TodoService]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(TodosComponent);
component = fixture.componentInstance;
});
it('should create', () => {
expect(component).toBeTruthy();
});
it('should load todos from the server', () => {
let svc = TestBed.get(TodoService);
let todoData = [
{id: 1, title: 'todo 1'},
{id: 2, title: 'todo 2'},
{id: 3, title: 'todo 3'}
];
spyOn(svc, 'getTodos').and.returnValues(todoData);
// This statement causes the ngOnInit method to get called
fixture.detectChanges();
expect(component.todos.length).toBe(3);
expect(component.todos).toBe(todoData);
});
});
When I run this test, I get the following errors: The first error occurs twice - not sure why..
zone.js:3272 Access to XMLHttpRequest at 'ng:///DynamicTestModule/TodosComponent_Host.ngfactory.js' from origin 'http://localhost:9876' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
TypeError: this.service.getTodos(...).subscribe is not a function
at TodosComponent../src/app/2-todos/todos.component.ts.TodosComponent.ngOnInit (_karma_webpack_/webpack:/src/app/2-todos/todos.component.ts:16)
at checkAndUpdateDirectiveInline (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:22099)
at checkAndUpdateNodeInline (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:23363)
at checkAndUpdateNode (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:23325)
at debugCheckAndUpdateNode (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:23959)
at debugCheckDirectivesFn (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:23919)
at Object.eval [as updateDirectives] (VM723 TodosComponent_Host.ngfactory.js:9)
at Object.debugUpdateDirectives [as updateDirectives] (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:23911)
at checkAndUpdateView (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:23307)
at callWithDebugContext (_karma_webpack_/webpack:/node_modules/@angular/core/fesm5/core.js:24177)
I am following a tutorial, and their test runs properly. They are using an older version of Angular - 4 I believe. My Karma, Angular are the latest stable version. If someone could help explain how to get around this issue I would be eternally grateful. Thanks in advance.
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