单元测试用例到模拟对象的功能

Question

How Pass event Mock object and get validated

onCallFunction() {
      const eventValue = event;
            if (!eventValue.relatedTarget || !eventValue.relatedTarget.last.contain('value')) {
                super.onCallFunction();
            }
     }

In Testbed declare event const but could not understand how to pass to function to execute the code

describe('relatedTarget test', () => {
  compoenent = fixture.componentInstance;

  it('should have value for property newValue', () {
    spyOn('component', 'onCallFunction');
    const event = {event: 
    { 
    relatedTarget: 
    {
     last: { 
      contain: (param) => {} 
     } 
    }
    }};
    component.onCallFunction();
    expect(component.onCallFunction).toHaveBeenCalled();
  })

});

Answer 1

First of all, you have not spelled "component" correctly so change the declaration to:

component = fixture.componentInstance;

You should also wrap that line in a beforeEach as so:

beforeEach(() => {
  component = fixture.componentInstance;
});

Then change your spy so that is actually spies on the function and declare it as a variable:

const spy = spyOn<any>(component, 'onCallFunction');

and change the expecation to actually ask the spy if it has been called:

expect(spy).toHaveBeenCalled();

Now the test should pass when you call component.onCallFunction() and expects it to have been called, but i'm having trouble understanding what the "event" variable is meant to do? What are you actually trying to test here?