[英]What is the correct way of testing chained catchError functions
我正在嘗試為已鏈接rxjs catchError
運算符的@Effect編寫茉莉花測試,但正在努力測試除第一個catchError
之外的任何可觀察catchError
。
這是效果:
@Effect() submitEndsheets$ = this.actions$.pipe(
ofType<SubmitEndSheets>(SpreadActionTypes.SUBMIT_ENDSHEETS),
withLatestFrom(this.store.pipe(select(fromAppStore.fromOrder.getDocumentId))),
concatMap(([action, documentId]) =>
this.spreadService.submitEndSheets(documentId).pipe(
map((response: ActionProcessorDto) => new SubmitEndSheetsSuccess(response.data)),
catchError((error) => of(undo(action))),
catchError((error) => of(new MessageModal({
message: error.message,
title: 'Submission Error!'
})
))
)
)
);
以及相應的測試:
it('handles errors by sending an undo action', () => {
const action = {
type: SpreadActionTypes.SUBMIT_ENDSHEETS,
};
const source = cold('a', { a: action });
const error = new Error('Error occurred!');
const service = createServiceStub(error);
const store = createStoreState();
const effects = new Effects(service, new Actions(source), store);
const expected = cold('ab', {
a: undo(action),
b: new MessageModal({
message: 'Sorry, something went wrong with your request. Please try again or contact support.',
title: 'Update Error!'
}),
});
expect(effects.submitEndsheets$).toBeObservable(expected);
});
作為參考,下面是模擬服務的createServiceStub
和您猜中的模擬商店的createStoreState
。
function createServiceStub(response: any) {
const service = jasmine.createSpyObj('spreadService', [
'load',
'update',
'updateSpreadPosition',
'submitEndSheets'
]);
const isError = response instanceof Error;
const serviceResponse = isError ? throwError(response) : of(response);
service.load.and.returnValue(serviceResponse);
service.update.and.returnValue(serviceResponse);
service.updateSpreadPosition.and.returnValue(serviceResponse);
service.submitEndSheets.and.returnValue(serviceResponse);
return service;
}
function createStoreState() {
const store = jasmine.createSpyObj('store', ['pipe']);
store.pipe.and.returnValue(of({ documentId: 123 }));
return store;
}
這是測試輸出:
FAILED TESTS:
✖ handles errors by sending an undo action
HeadlessChrome 0.0.0 (Mac OS X 10.14.2)
Expected $.length = 1 to equal 2.
Expected $[1] = undefined to equal Object({ frame: 10, notification: Notification({ kind: 'N', value: MessageModal({ payload: Object({ message: 'Sorry, something went wrong with your request. Please try again or contact support.', title: 'Update Error!' }), type: 'MESSAGE_MODAL' }), error: undefined, hasValue: true }) }).
at compare node_modules/jasmine-marbles/bundles/jasmine-marbles.umd.js:389:1)
at UserContext.<anonymous> src/app/book/store/spread/spread.effects.spec.ts:197:46)
at ZoneDelegate../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:388:1)
在此先感謝您的幫助!
更新: catchError
可以將一系列動作發送回效果之外,如下所示:
@Effect() submitEndsheets$ = this.actions$.pipe(
ofType<SubmitEndSheets>(SpreadActionTypes.SUBMIT_ENDSHEETS),
withLatestFrom(this.store.pipe(select(fromAppStore.fromOrder.getDocumentId))),
concatMap(([action, documentId]) =>
this.spreadService.submitEndSheets(documentId).pipe(
map((response: ActionProcessorDto) => new SubmitEndSheetsSuccess(response.data)),
catchError(error => [
new PopSingleToast({
severity: ToastSeverity.error,
summary: 'Failure',
detail: `Some error occurred: \n Error: ${error}`
}),
undo(action)
])
)
)
);
相應的測試如下所示:
it('handles errors by sending an undo action', () => {
const action = {
type: SpreadActionTypes.SUBMIT_ENDSHEETS
};
const source = cold('a', { a: action });
const error = new Error('Error occurred!');
const service = createServiceStub(error);
const store = createStoreState();
const effects = new Effects(service, new Actions(source), store);
const expectedAction = new PopSingleToast({
severity: ToastSeverity.error,
summary: 'Failure',
detail: `Some error occurred: \n Error: ${error}`
});
const expected = cold('(ab)', {
a: expectedAction,
b: undo(action)
});
expect(effects.submitEndsheets$).toBeObservable(expected);
});
感謝大家的幫助!
這樣連續有兩個catchErrors
意味着第二個永遠不會觸發,因為第一個會吞噬錯誤。
您需要在第一個catchError
重新拋出該錯誤才能進入第二個錯誤:
catchError(error => throw new Error()),
catchError(error => console.log('now I trigger'))
因此,恐怕您的問題沒有任何意義。
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