I'm trying to write a unit test to see if the base class method gets called
Here is the base class
export abstract class Animal{
protected eatFood() {
console.log("EAT FOOD!")
}
}
Here is the class I want to test
export class Monkey extends Animal {
onHungry(){
this.eatFood();
}
}
Here is the test
class MockAnimal {
public eatFood() {
console.log("EAT MOCKED FOOD!");
}
}
describe('Monkey', () => {
beforeEach(() => {
TestBed.configureTestingModule({
declarations:[Monkey],
providers: [
{ provide: Animal, useClass: MockAnimal }
]
}
});
it('eat food when hungry', fakeAsync(() => {
let fixture = TestBed.createComponent(Monkey);
spyOn(fixture, 'eatFood');
fixture.componentInstance.onHungry();
expect(fixture.eatFood).toHaveBeenCalled();
}));
}
I can't get the unit test to run this MockAnimal class. Is this how to test it?
The TestBed is used to test components and as in a normal NgModule you define declarations, imports, providers, ... But what you want to test is a simple class. In the test you have to initialize it manually:
describe('Monkey', () => {
it('eats if hungry', () => {
const monkey = new Monkey();
// spying will only work if 'eatFood' is public
const eatFoodSpy = spyOn(monkey, 'eatFood');
monkey.onHungry();
expect(eatFoodSpy).toHaveBeenCalled();
});
});
You can do this, that will mock your call.
it('eat food when hungry', fakeAsync(() => {
let fixture = TestBed.createComponent(Monkey);
fixture.componentInstance['eatFood'] = jasmine.createSpy('eatFood');
fixture.componentInstance.onHungry();
expect(fixture.eatFood).toHaveBeenCalled();
}));