How to cover catchError in test code coverage

user_8475381 0
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How can I cover the catchError in my angular test?

this.service.method().pipe(
  tap(ret=>{
   console.log('my return', ret);
  }),
 catchError(error=>{
   console.log('error occured');
   return throwError(error);
  })
).subscribe();

In my test, I mocked the service and the method.

let serviceMock = jasmine.createSpyObj('Service',{
 method: of({message: 'success'})
})

Codes inside tap is covered but not in catchError.

angular
1 Answers

You can mock an error like below:

let isError = false;
let serviceMock = jasmine.createSpyObj('Service',{
 method: isError ? throwError('') : of({message: 'success'})
})

This way you can set isError in your test cases to either success or error.

user_151556400
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