如何为 Angular 组件单元测试模拟 FormBuilder
How to mock a FormBuilder for Angular Component Unit Test
我在 Angular 9 项目中工作。
我有一个组件接受 formBuilder 作为来自父组件的输入。
这是我的子组件(我正在测试的那个):
export class ChildComponent implements OnInit {
@Input() parentForm: FormGroup; //this is coming from the parentComponent
ngOnInit(): void {
if (this.parentForm) {
this.filteredSelectables = this.parentForm
.get("recipientTypes")
...
}
}
...
我想为这个组件编写测试,但我需要创建一个测试可以使用的表单(或者我需要模拟父组件和 return 我想要的表单?)
我已将 FormBuilder 添加到 testBed 提供程序,但我仍然无法弄清楚如何制作我可以用来测试的模拟表单。 'should create' 测试通过了,但我无法测试其他任何东西,因为 parentForm 不能为它们。这是我当前的测试:
describe("ChildComponent", () => {
let component: ChildComponent;
let fixture: ComponentFixture<ChildComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ChildComponent, MatAutocomplete],
providers: [FormBuilder],
schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
.compileComponents()
.then(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
});
}));
beforeEach(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it("should create", () => {
expect(component).toBeTruthy();
});
...
我试过这样创建表单:
component.parentForm = FormBuilder.group({
recipientTypes: new FormControl(
{
value: ["mock"],
disabled: true
},
Validators.required
)
});
并将其添加到 beforeEach() 甚至实际测试中。但是我得到一个错误。
我想也许我需要模拟 parentComponent 并让它发送一个 formBuilder?
这是我的父组件:
export class ParentComponent implements OnInit, OnDestroy {
parentForm: FormGroup;
constructor(
private router: Router,
private formBuilder: FormBuilder
) {}
ngOnInit() {
this.setFormTemplate();
}
setFormTemplate() {
this.templateForm = this.formBuilder.group({
name: new FormControl(
{
value: this.name,
disabled: true
},
Validators.required
),
recipientTypes: new FormControl(
{
value: this.recipientTypes,
disabled: true
},
Validators.required
)
});
}
...
如何为我的测试创建一个 formBuilder?
试试吧!:
import { FormBuilder } from '@angular/forms';
....
describe("ChildComponent", () => {
let component: ChildComponent;
let fixture: ComponentFixture<ChildComponent>;
let formBuilder: FormBuilder;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ChildComponent, MatAutocomplete],
providers: [FormBuilder], // add this as a provider
schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
.compileComponents()
.then(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
});
}));
beforeEach(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
formBuilder = TestBed.inject(FormBuilder); // get a handle on formBuilder
// add the mock data here
component.parentForm = formBuilder.group({
recipientTypes: new FormControl(
{
value: ["mock"],
disabled: true
},
Validators.required
)
});
// this fixture.detectChanges will kick off the ngOnInit
fixture.detectChanges();
});
it("should create", () => {
expect(component).toBeTruthy();
});
我在 Angular 9 项目中工作。
我有一个组件接受 formBuilder 作为来自父组件的输入。 这是我的子组件(我正在测试的那个):
export class ChildComponent implements OnInit {
@Input() parentForm: FormGroup; //this is coming from the parentComponent
ngOnInit(): void {
if (this.parentForm) {
this.filteredSelectables = this.parentForm
.get("recipientTypes")
...
}
}
...
我想为这个组件编写测试,但我需要创建一个测试可以使用的表单(或者我需要模拟父组件和 return 我想要的表单?)
我已将 FormBuilder 添加到 testBed 提供程序,但我仍然无法弄清楚如何制作我可以用来测试的模拟表单。 'should create' 测试通过了,但我无法测试其他任何东西,因为 parentForm 不能为它们。这是我当前的测试:
describe("ChildComponent", () => {
let component: ChildComponent;
let fixture: ComponentFixture<ChildComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ChildComponent, MatAutocomplete],
providers: [FormBuilder],
schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
.compileComponents()
.then(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
});
}));
beforeEach(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it("should create", () => {
expect(component).toBeTruthy();
});
...
我试过这样创建表单:
component.parentForm = FormBuilder.group({
recipientTypes: new FormControl(
{
value: ["mock"],
disabled: true
},
Validators.required
)
});
并将其添加到 beforeEach() 甚至实际测试中。但是我得到一个错误。
我想也许我需要模拟 parentComponent 并让它发送一个 formBuilder? 这是我的父组件:
export class ParentComponent implements OnInit, OnDestroy {
parentForm: FormGroup;
constructor(
private router: Router,
private formBuilder: FormBuilder
) {}
ngOnInit() {
this.setFormTemplate();
}
setFormTemplate() {
this.templateForm = this.formBuilder.group({
name: new FormControl(
{
value: this.name,
disabled: true
},
Validators.required
),
recipientTypes: new FormControl(
{
value: this.recipientTypes,
disabled: true
},
Validators.required
)
});
}
...
如何为我的测试创建一个 formBuilder?
试试吧!:
import { FormBuilder } from '@angular/forms';
....
describe("ChildComponent", () => {
let component: ChildComponent;
let fixture: ComponentFixture<ChildComponent>;
let formBuilder: FormBuilder;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ChildComponent, MatAutocomplete],
providers: [FormBuilder], // add this as a provider
schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
.compileComponents()
.then(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
});
}));
beforeEach(() => {
fixture = TestBed.createComponent(ChildComponent);
component = fixture.componentInstance;
formBuilder = TestBed.inject(FormBuilder); // get a handle on formBuilder
// add the mock data here
component.parentForm = formBuilder.group({
recipientTypes: new FormControl(
{
value: ["mock"],
disabled: true
},
Validators.required
)
});
// this fixture.detectChanges will kick off the ngOnInit
fixture.detectChanges();
});
it("should create", () => {
expect(component).toBeTruthy();
});