Unit testing the error function within the subscribe method in Angular

I've been working on a unit test for the subscribe call, but I'm struggling to cover the error handling aspect of the subscribe method. The handleError function deals with statusCode=403 errors and other status codes. Any assistance would be greatly appreciated!

component.ts file

  getData(){
    this.someService.getResponse().subscribe(res=>{
      this.showForm = true;
      this.Form.patchValue({
        flag:res && res.someflag? "true" : "false"
      })
    }, (error: HttpErrorResponse) => {       
        this.handleError(error);
      }); 
    }
  

handleError() function in component.ts file

  handleError(error){
    this.showForm=false;
    if(error.error && error.error.statusCode === 403){
       this.itemError=false;
       this.overlayError=true;
    }
    else{
      this.itemError=true;
      this.overlayError=false;
    }
  }

component.spec.ts file

I attempted the following test case, but it doesn't fully cover the scenario.

it('should handle error for 403',async()=>{
  const param={statusCode:403};
  const errorResponse=new Error('403 errror');
  spyOn(component["someService"],"getResponse").and.returnValue(throwError(errorResponse));

  component.handleStatusCodeError(param);
  expect(component.showForm).toBe(false);   
  expect(component.itemError).toBe(false);  
  expect(component.overlayError).toBe(true);  
})

Answer №1

Instead of

try using the Error constructor like this:

create a new error response like this instead:

const errorResponse = new HttpErrorResponse({ status: 403, message: 'Forbidden'});

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