使用 Jasmine 和 Karma 对 Angular 进行单元测试,错误:无法绑定到“xxx",因为它不是“xxxxxx"的已知属性. [英] Unit test Angular with Jasmine and Karma, Error:Can't bind to 'xxx' since it isn't a known property of 'xxxxxx'.
问题描述
我在使用 Jasmine 和 Karma 进行 angular 5 单元测试时遇到问题.
I have a problem with an unit test in angular 5 with Jasmine and Karma.
错误是:无法绑定到 'fruits',因为它不是 'my-component2' 的已知属性".
The error is: "Can't bind to 'fruits' since it isn't a known property of 'my-component2'".
单元测试代码为:
src/app/components/my-component1/my-component1.component.spec.ts:
src/app/components/my-component1/my-component1.component.spec.ts:
import { TestBed, inject, ComponentFixture, async} from '@angular/core/testing';
import {HttpClientTestingModule, HttpTestingController} from '@angular/common/http/testing';
import { Post } from '../../models/post.model';
import { MyComponent1Component } from './my-component1.component';
import { MyService1Service } from '../../services/my-service1.service';
import { HttpClientModule, HttpClient,HttpHandler } from '@angular/common/http';
import {fruit} from '../../Models/fruit';
fdescribe('MyComponent1Component', () => {
let component: MyComponent1Component;
let fixture: ComponentFixture<MyComponent1Component>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ MyComponent1Component ],
imports: [],
providers: [MyService1Service, HttpClient, HttpHandler, HttpTestingController]
})
.compileComponents();
}));
beforeEach(async(() => {
fixture = TestBed.createComponent(MyComponent1Component);
component = fixture.componentInstance;
fixture.detectChanges();
}));
it('should create', () => {
expect(component).toBeTruthy();
});
});
这些是我的组件的代码:
And these are the code of my components:
src/app/components/my-component1/my-component1.component.ts:
src/app/components/my-component1/my-component1.component.ts:
import { Component, OnInit } from '@angular/core';
import { MyService1Service} from '../../services/my-service1.service';
import {fruit} from '../../Models/fruit';
@Component({
selector: 'my-component1',
templateUrl: './my-component1.component.html',
styleUrls: ['./my-component1.component.css']
})
export class MyComponent1Component implements OnInit {
constructor(private _MyService1Service: MyService1Service) { }
public fruit= new fruit();
public fruits: fruit[];
ngOnInit() {
this._MyService1Service.getPost().subscribe(
result => {
console.log(result);
},
error => {
console.log(<any>error);
}
);
this.fruit.name = 'apple';
this.fruits.push(this.fruit);
}
}
src/app/components/my-component1/my-component1.component.html:
src/app/components/my-component1/my-component1.component.html:
<p>
my-component1 works!
</p>
<my-component2 [fruits]=fruits></my-component2>
src/app/components/my-component2/my-component2.component.ts:
src/app/components/my-component2/my-component2.component.ts:
import { Component, OnInit, Input } from '@angular/core';
import {fruit} from '../../Models/fruit';
@Component({
selector: 'my-component2',
templateUrl: './my-component2.component.html',
styleUrls: ['./my-component2.component.css']
})
export class MyComponent2Component implements OnInit {
@Input() fruits: fruit[];
constructor() { }
ngOnInit() {
}
}
src/app/components/my-component2/my-component2.component.html:
src/app/components/my-component2/my-component2.component.html:
<p>
my-component2 works!
</p>
这是一个虚拟项目,有人可以帮助我吗?
It is a dummy project, can anybody help me?
谢谢:)
推荐答案
您需要在创建测试模块时添加第二个组件,因为该模块是组件 1 的一部分.如果您不添加,该模块将没有我的-component2,输入无效.
You need to add your second component when creating your testing module as that module is part of component 1. If you don't the module won't have my-component2 and the input will be invalid.
TestBed.configureTestingModule({
declarations: [ MyComponent1Component, MyComponent2Component ],
imports: [],
providers: [MyService1Service, HttpClient, HttpHandler, HttpTestingController]
})
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