[Solved] What is wrong with this test snippet?const req = httpMock.expectOne('/api/items'); req.flush({ data: 'test' }); httpMock.expectOne('/api/items'); | Angular

Angular - Testing

What is wrong with this test snippet?

const req = httpMock.expectOne('/api/items');
req.flush({ data: 'test' });
httpMock.expectOne('/api/items');

ASecond expectOne will throw because no new request was made

Bflush must be called after all expectOne calls

CexpectOne cannot be called twice with the same URL

Dflush cannot send an object as response

Step-by-Step Solution

Solution:

Step 1: Analyze the test flow
First expectOne matches a request and flushes a response.
Step 2: Check second expectOne call
No new request was made after flush, so second expectOne throws error.
Final Answer:
Second expectOne will throw because no new request was made -> Option A
Quick Check:
expectOne requires a matching new request each time [OK]

Quick Trick: Each expectOne must match a new HTTP request [OK]

Common Mistakes:

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