event-emitters/dist.es2018/EventEmitterWithOptionalCurrent.spec.js

event emitters

import { EventEmitterWithOptionalCurrent } from './EventEmitterWithOptionalCurrent';
describe('EventEmitterWithOptionalCurrent', () => {
    /* eslint-disable @typescript-eslint/explicit-function-return-type */
    it('sends current status when it was provided and listener first subscribes', () => {
        let current = 42;
        const emitter = new EventEmitterWithOptionalCurrent(1);
        emitter.subscribe((newVal) => {
            current = newVal;
        });
        expect(current).toEqual(1);
    });
    it('does not send any status when listener subscribes when no current value was provided', () => {
        let current = 42;
        const emitter = new EventEmitterWithOptionalCurrent();
        emitter.subscribe((newVal) => {
            current = newVal;
        });
        expect(current).toEqual(42);
    });
    it('updates subscribed listener with statuses as they change', () => {
        let current = 42;
        const emitter = new EventEmitterWithOptionalCurrent();
        emitter.subscribe((newVal) => {
            current = newVal;
        });
        expect(current).toEqual(42);
        const firstVal = 1;
        emitter.emit(firstVal);
        expect(current).toEqual(firstVal);
        let otherValue = 43;
        emitter.subscribe((newVal) => {
            otherValue = newVal;
        });
        expect(otherValue).toEqual(1);
    });
});
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