[Solved] In this test, why does httpMock.verify() cause the test to fail?service.getData().subscribe(); // forgot to call httpMock.expectOne and flush httpMock.verify(); | Angular

Angular - Testing

In this test, why does httpMock.verify() cause the test to fail?

service.getData().subscribe();
// forgot to call httpMock.expectOne and flush
httpMock.verify();

ABecause verify requires a flush call first

BBecause verify must be called before subscribe

CBecause verify only works with POST requests

DBecause there is an outstanding HTTP request not handled

Step-by-Step Solution

Solution:

Step 1: Understand verify() purpose
verify() checks that no HTTP requests are outstanding (unmatched or unflushed).
Step 2: Identify missing expectOne and flush
Without expectOne and flush, the request remains pending, causing verify() to fail.
Final Answer:
Because there is an outstanding HTTP request not handled -> Option D
Quick Check:
verify fails if requests remain unhandled [OK]

Quick Trick: Always expectOne and flush before verify() [OK]

Common Mistakes:

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In this test, why does httpMock.verify() cause the test to fail?