How do I perform unit testing with jasmine for angular components when using material theme

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Jasmine

angular-cli

Angular5

Hi , I am following the unit test cases from the below article.

https://code.tutsplus.com/tutorials/testing-components-in-angular-using-jasmine--cms-29165 (part 1 and part2)

The problem is, dom value settings from spec files by inspecting the element and checking with model values doesn't seem to be working when using material element.

What I have tried:

I have checked many sites but none showing how to do when using material.

I have tried below things but it is working for input elemnt but not for select and many other material elemnts

it('should accept input values', () => {
            // Query the input selectors
            question1 = fixture.debugElement.query(By.css('mat-select')).nativeElement;
            answer1 = fixture.debugElement.query(By.css('input[type=text]')).nativeElement;

            // Set the input element's value to mockPaste
            question1.value = mockSecurityModel.question1.toString();
            answer1.value = mockSecurityModel.answer1;

            // Dispatch an event to tell the component input value has changed
            question1.dispatchEvent(new Event('change'));
            answer1.dispatchEvent(new Event('input'));

            // expect(mockSecurityModel.question1).toEqual(component.viewModel.question1);
            expect(mockSecurityModel.answer1).toEqual(component.viewModel.answer1);

        });

and now here the problem is I unable to validate my test case for mat-select.