如何模拟 Angular 单元测试中从 afterClosed 发送的 MatDialog 的响应?
How to mock a response from MatDialog sent from afterClosed in Angular unit tests?
我正在尝试为 MatDialog 编写一些单元测试。我想做的是模拟对话框的响应并测试它是否被组件正确处理。
在我的组件中,我应该从关闭的对话框中获取 Map<string, any>
并将它们设置到 myData
地图中。
my.component.ts
export class MyComponent {
public myData = new Map<string, any>();
constructor(public dialog: MatDialog) { }
public openDialog(): void {
const dialogRef = this.dialog.open(LoadDataComponent);
dialogRef.afterClosed().subscribe(response => {
response.data.forEach(item => {
this.myData.set(item.id, item);
});
});
}
}
my.component.spec.ts
describe('MyComponent', () => {
let component: MyComponent;
let fixture: ComponentFixture<MyComponent>;
const responseMock = new Map<string, any>();
class DialogMock {
open(): any {
return {
afterClosed: () => of(responseMock)
};
}
}
beforeEach(async () => {
await TestBed.configureTestingModule({
declarations: [
MyComponent
],
providers: [
{ provide: MatDialog, useClass: DialogMock },
]
})
.compileComponents();
});
beforeEach(() => {
fixture = TestBed.createComponent(MyComponent);
component = fixture.componentInstance;
component.myData = new Map<string, any>();
fixture.detectChanges();
responseMock.set('test', {value: 'test'});
responseMock.set('test2', {value: 'test2'});
});
it('should get data from dialog', fakeAsync(() => {
spyOn(component.dialog, 'open').and.returnValue({
afterClosed: () => of(responseMock)
} as MatDialogRef<typeof component>);
component.openDialog();
expect(component.myData.size).toBe(2);
}));
});
在我的规范文件中,我创建了一些 responseMock
,我试图将其用作响应,但我的测试完全失败了:
Chrome Headless 91.0.4472.164 (Windows 10) ERROR
An error was thrown in afterAll
TypeError: Cannot read property 'forEach' of undefined
Chrome 91.0.4472.164 (Windows 10) MyComponent should get data from dialog FAILED
Error: Expected 0 to be 2.
如何在我的单元测试中模拟来自 MatDialog 的响应,以便 MyComponent
正确处理它?
在测试的方法中,有一个针对响应数据的循环:response.data.forEach
。根据模拟设置,response
的值将是 const responseMock = new Map<string, any>();
。它不包含 data
属性。要修复它,您可以将响应模拟更改为
const responseMock = {data: new Map<string, any>()};
我正在尝试为 MatDialog 编写一些单元测试。我想做的是模拟对话框的响应并测试它是否被组件正确处理。
在我的组件中,我应该从关闭的对话框中获取 Map<string, any>
并将它们设置到 myData
地图中。
my.component.ts
export class MyComponent {
public myData = new Map<string, any>();
constructor(public dialog: MatDialog) { }
public openDialog(): void {
const dialogRef = this.dialog.open(LoadDataComponent);
dialogRef.afterClosed().subscribe(response => {
response.data.forEach(item => {
this.myData.set(item.id, item);
});
});
}
}
my.component.spec.ts
describe('MyComponent', () => {
let component: MyComponent;
let fixture: ComponentFixture<MyComponent>;
const responseMock = new Map<string, any>();
class DialogMock {
open(): any {
return {
afterClosed: () => of(responseMock)
};
}
}
beforeEach(async () => {
await TestBed.configureTestingModule({
declarations: [
MyComponent
],
providers: [
{ provide: MatDialog, useClass: DialogMock },
]
})
.compileComponents();
});
beforeEach(() => {
fixture = TestBed.createComponent(MyComponent);
component = fixture.componentInstance;
component.myData = new Map<string, any>();
fixture.detectChanges();
responseMock.set('test', {value: 'test'});
responseMock.set('test2', {value: 'test2'});
});
it('should get data from dialog', fakeAsync(() => {
spyOn(component.dialog, 'open').and.returnValue({
afterClosed: () => of(responseMock)
} as MatDialogRef<typeof component>);
component.openDialog();
expect(component.myData.size).toBe(2);
}));
});
在我的规范文件中,我创建了一些 responseMock
,我试图将其用作响应,但我的测试完全失败了:
Chrome Headless 91.0.4472.164 (Windows 10) ERROR An error was thrown in afterAll TypeError: Cannot read property 'forEach' of undefined
Chrome 91.0.4472.164 (Windows 10) MyComponent should get data from dialog FAILED Error: Expected 0 to be 2.
如何在我的单元测试中模拟来自 MatDialog 的响应,以便 MyComponent
正确处理它?
在测试的方法中,有一个针对响应数据的循环:response.data.forEach
。根据模拟设置,response
的值将是 const responseMock = new Map<string, any>();
。它不包含 data
属性。要修复它,您可以将响应模拟更改为
const responseMock = {data: new Map<string, any>()};