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import createSubject from '../../utils/createSubject';
describe('createSubject', () => {
it('should subscribe to all the correct observer', () => {
const subject = createSubject();
const next = jest.fn();
subject.subscribe({
next,
});
subject.subscribe({
next,
});
expect(subject.observers.length).toBe(2);
subject.next(2);
expect(next).toBeCalledTimes(2);
expect(next).toBeCalledWith(2);
});
it('should unsubscribe observers', () => {
const subject = createSubject();
const next1 = jest.fn();
const next2 = jest.fn();
const subscription = subject.subscribe({
next: next1,
});
subject.subscribe({
next: next2,
});
expect(subject.observers.length).toBe(2);
subscription.unsubscribe();
expect(subject.observers.length).toBe(1);
subject.next(2);
expect(next1).not.toBeCalled();
expect(next2).toBeCalledWith(2);
});
it('should unsubscribe all observers', () => {
const subject = createSubject();
const next = jest.fn();
subject.subscribe({
next,
});
subject.subscribe({
next,
});
expect(subject.observers.length).toBe(2);
subject.unsubscribe();
expect(subject.observers.length).toBe(0);
subject.next(2);
subject.next(2);
expect(next).not.toBeCalled();
});
});
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