check if setter was used

Question

I have a setter/getter in my service

export class fooService {
  set foo(value: number): void {
    this._privateFoo = value;
  }
  get foo(): number {
    return this._privateFoo;
  }

Now i mocked the service using ts-mockito and want to check if the setter has been called. I tried checking the variable via the getter on the instance but this does not return my value.

component (FooComponent):

ngOnInit() {
  this.fooService.foo = 2;
  console.log('Foo Service is now:', this.fooService.foo);

unit test:

mockFooService = mock(FooService);
fooService = instance(mockFooService);
...
TestBed.configureTestingModule({
 declarations: [ FooComponent ],
  providers: [
    { provide: FooService: useValue: fooService }
...

component.ngOnInit();
expect(fooService.foo).toEqual(2);

The Test prints Foo Service is now: 2 but the expect fails with Expected null to equal 2.

Not sure about this, but maybe you just have the getter missing ? — Kapcash, Apr 03 '19 at 10:22
without getter value of `foo` is null. the real value is in `_privateFoo` and there no way get real value. — miladfm, Apr 03 '19 at 10:26
I have a getter (just added it to the question). Otherwise the console log would not print anything out. — Andresch Serj, Apr 03 '19 at 10:30
You are not showing the whole test structure in your post, how are you including the component in the test? — Lucho, Apr 03 '19 at 10:38

score 1 · Accepted Answer · answered Apr 03 '19 at 10:50

1

My Problem was obvious: If i mock the service, it is not working anymore. What i should do is either mock a setter and check if it is called or use the actual service.

answered Apr 03 '19 at 10:50

Andresch Serj

35,217
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Depends on how complex your service is in your testing, if it has alot of dependencies that actually has nothing to do what you wanna test I would go with mocking the service – Lucho Apr 03 '19 at 10:55

score 0 · Answer 2 · answered Apr 03 '19 at 10:27

0

Use setter and getter together.

set foo(value: number): void {
  this._privateFoo = value;
}

get foo(): number{
  return this._privateFoo;
}

answered Apr 03 '19 at 10:27

miladfm

1,508
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20

Sorry, i do have a getter. I added it to my question. – Andresch Serj Apr 03 '19 at 10:29

check if setter was used

2 Answers2