我正在使用Jasmine/karma为角度6组件中的可观察对象编写一个单元测试用例。请找到我正在为其编写测试用例的组件方法。
public ngOnInit(): void {
{
this.editOrderContainer.getEditOrderState().subscribe(editOrderState => {
this.shipAddressEditted = editOrderState.data.shipAddressEdited;
this.shipInstructionEditted = editOrderState.data.shipInstructionEditted;
this.hasShippingDetailsChanged = (this.shipAddressEditted || this.shipInstructionEditted) && this.existedAffectedOrderNumbers;
});
...
}
在上面的代码中,我的测试用例应该涵盖/期望变量"hasShippingDetailsChanged"。在规范文件中,我会有"它"如下
it('verify if Shipping instructions text is set to true if instructions test is changed.', () => {
expect(component.hasShippingDetailsChanged).toBeTruthy();
});
.spec 文件中的模拟/间谍代码如下:
let editOrderContainer: any;
let getEditOrderState: any;
beforeEach(async () => {
...
editOrderContainer = jasmine.createSpyObj('editOrderContainer', ['getEditOrderState', 'rebookOrder']);
editOrderContainer.getEditOrderState.and.callFake(() => {
return getEditOrderState;
});
getEditOrderState = {
subscribe: function () {
return getOrderDetailsServiceResult();
}
};
spyOn(getEditOrderState, 'subscribe').and.callThrough();
...
});
function getOrderDetailsServiceResult() {
return {
shipAddressEditted: true,
shipInstructionEditted : true
};
}
EditOrderContainer 代码如下所示:
public getEditOrderState(): Observable<EditOrderState> {
return this.store.select(s => s.editOrderReducer);
}
我在这里面临的问题是,它是在订阅中重新执行 editOrderState 的值,并且 lambda 表达式语句没有被执行
即,shipAddressEditted,shipInstruction Editted,hasShippingDetailsChanged的赋值语句未被执行。 我希望执行这些行,以便所需的变量具有运输详细信息更改以分配。
任何想法我在这里犯了什么错误? 为什么订阅 lambda 表达式没有在规范文件中执行?
尝试使用stub
,以便也可以在其他地方重复使用。请尝试以下更改:
- 使
editOrderContainer
在构造函数中public
:
constructor(public editOrderContainer: EditOrderContainer,.....)
- 创建一个
stub
,如下所示EditOrderContainerStub
:
export class EditOrderContainerStub{
getEditOrderState(){
return of({
data: {
shipAddressEditted: true,
shipInstructionEditted : true
}
})
}
}
providers
spec
文件:
beforeEach(async () => {
providers:[{provide: EditOrderContainer , useClass: EditOrderContainerStub}],
//....... your declaration
});
it('verify if Shipping instructions text is set to true if instructions test is changed.', () => {
component.existedAffectedOrderNumbers = true;
component.ngOnInit();
expect(component.hasShippingDetailsChanged).toBeTruthy();
});
我找到了答案,问题在于我为 editOrderContainer 及其返回可观察量的方法 getEditOrderState 创建间谍的方式。
在我以前的代码中缺少Observable.of(editOrderState)
这是必需的。 我也不应该或不需要模拟/监视subscribe
方法
我的间谍对象如下所示。
editOrderContainer = jasmine.createSpyObj('editOrderContainer', ['getEditOrderState', 'rebookOrder']);
editOrderContainer.getEditOrderState.and.callFake(() => {
var editOrderState = getOrderDetailsServiceResult();
return Observable.of(editOrderState);
});
function getOrderDetailsServiceResult() {
return {
data: {
shipAddressEdited: true,
shipInstructionEditted: true
}
};
}