[英]How to create a basic unit test in Angular
我有一个组件Strip
。 它是一个简单的 HTML 卡片,带有一些数字和计算。 这是代码:
import { Component, Input, NgZone, OnInit } from '@angular/core';
import './strip.component.scss';
import { SisenseService } from '../../core/services/sisense.service';
@Component({
selector: 'app-strip',
templateUrl: './strip.component.html'
})
export class StripComponent extends BaseCardComponent implements OnInit {
constructor(private zone: NgZone, private sisenseService: SisenseService) {
super();
}
ngOnInit(): void {
}
}
我正在注入 2 个服务, SisenseService
和NgZone
。
我正在编写一个非常简单的测试用例。 这是规范文件:
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { StripComponent } from './strip.component';
import { CUSTOM_ELEMENTS_SCHEMA, NgZone } from '@angular/core';
import { TranslateModule } from '@ngx-translate/core';
import { SisenseService } from '../../core/services/sisense.service';
describe('StripComponent', () => {
let component: StripComponent;
let fixture: ComponentFixture<StripComponent>;
let sisenseService: SisenseService;
let ngZone: NgZone;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [StripComponent],
imports: [TranslateModule.forRoot()],
schemas: [CUSTOM_ELEMENTS_SCHEMA],
providers: [SisenseService, NgZone]
}).compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(StripComponent);
component = fixture.componentInstance;
fixture.detectChanges();
sisenseService = TestBed.get(SisenseService);
ngZone = TestBed.get(NgZone);
});
it('should create', () => {
expect(component).toBeTruthy();
});
});
但它没有告诉我:
Chrome Headless 76.0.3803.0 (Windows 10) StripComponent 应该创建 FAILED 失败:无法解析 NgZone 的所有参数:(?)。 错误:无法解析 NgZone 的所有参数:(?)。
请指出我的错误。
尝试模拟 NgZone 并在提供程序中使用它
const mockNgZone = jasmine.createSpyObj('mockNgZone', ['run', 'runOutsideAngular']);
mockNgZone.run.and.callFake(function () {return undefined;});
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [StripComponent],
imports: [TranslateModule.forRoot()],
schemas: [CUSTOM_ELEMENTS_SCHEMA],
providers: [
SisenseService,
{provide: NgZone, useValue: mockNgZone}
]
}).compileComponents();
}));
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