Test subscriber

subscribe.test.js

import { makeSubscriber } from "../src/redux/store/subscribe.js";

import assert from "assert";

describe("subscribe.js", () => {
   describe("makeSubscriber", () => {
      it("generates a function from subscribers", () => {
          const subscribers = [];
          const subscriber = makeSubscriber(subscribers);

          assert.equal(subscriber.hasOwnProperty("subscribe"), true);
      });

      it("calls the subscriber", () => {
          const subscribers = [];
          const spyOnSubscribe = { called: false };

          const { subscribe } = makeSubscriber(subscribers);

          subscribe(() => (spyOnSubscribe.called = true));
          subscribers.forEach((subscription) => subscription());

          const expected = true;
          const actual = spyOnSubscribe.called;

          assert.equal(actual, expected);
      });
   });
});