plain-observable/lib/__tests__/subject.spec.js

A simple implementation of observable pattern

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const index_1 = require("../index");
describe('Subject', () => {
    let source;
    beforeEach(() => {
        source = new index_1.Subject();
    });
    test('should add observer when calling register method', () => {
        spyOn(source, 'register');
        source.register({
            update(value) {
                console.log(value);
            }
        });
        expect(source.register).toHaveBeenCalled();
    });
    test('should notify observers with the passed value', () => {
        const value = 'notify';
        source.register({
            update(value) {
                expect(value).toBe(value);
            }
        });
        spyOn(source, 'notify');
        source.notify(value);
        expect(source.notify).toHaveBeenCalledWith(value);
    });
    test('should unregister observer', () => {
        const unregister = source.register({
            update(value) {
                expect(value).toBe(value);
            }
        });
        unregister();
        expect(source.size).toBe(0);
    });
});