Jasmine test fails Expected undefined to equal

I have written an angular test to test httpstatus 0 code returned when the service is not available. While running the test I am getting the following error. What is the possible issue here

Testing the interceptor class > making http calls > Adds a deliberate error code 0
Error: Expected undefined to equal 0.

Expected undefined to equal 'deliberate 0 error -  Unknown Error'.
Error: Expected undefined to equal 'deliberate 0 error -  Unknown Error'.

Unit Test

describe('making http calls', () => {
        it('Adds a deliberate error code 0', inject([HttpClient, HttpTestingController], (http: HttpClient, httpMock: HttpTestingController) => {            

            spyOn(console, 'error');

            const fakeUrl = "http://localhost:57973/"; 
            const mockErrorResponse = { status: 0, statusText: 'deliberate 0 error -  Unknown Error' };
            const emsg = 'deliberate 0 error -  Unknown Error';
            let errResponse: any;

            httpClient.get(fakeUrl).subscribe(
                (response) => {
                    fail('deliberate 0 error -  Unknown Error');
                },
                (error: HttpErrorResponse) => {                    
                    expect(error.status).toEqual(0, 'status');
                    expect(error.error).toEqual(emsg, 'message');
                });



            const req = httpMock.expectOne(fakeUrl);

            httpMock.verify();

            req.flush(emsg, { status: 0, statusText: 'Unknown Error' });

            expect(routerSpy.navigate).toHaveBeenCalledWith(['offline']);

            expect(console.error).toHaveBeenCalled();

        }));

    });

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