@snowplow/javascript-tracker/test/unit/in_queue.test.ts

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import { InQueueManager } from '../../src/in_queue';

import {
  enableActivityTracking,
  setVisitorCookieTimeout,
  trackPageView,
  updatePageActivity,
  setUserId,
} from '@snowplow/browser-tracker';
import { BrowserTracker, addTracker, isFunction, getTrackers } from '@snowplow/browser-tracker-core';

jest.mock('@snowplow/browser-tracker');
jest.mock('@snowplow/browser-tracker-core');
const mockNewTracker = addTracker as jest.Mock<BrowserTracker>;
const mockGetTrackers = getTrackers as jest.Mock<Array<BrowserTracker>>;
const mockEnableActivityTracking = enableActivityTracking as jest.Mock<void>;
const mockSetVisitorCookieTimeout = setVisitorCookieTimeout as jest.Mock<void>;
const mockTrackPageView = trackPageView as jest.Mock<void>;
const mockUpdatePageActivity = updatePageActivity as jest.Mock<void>;
const mockSetUserId = setUserId as jest.Mock<void>;
const mockIsFunction = isFunction as jest.Mock<boolean>;

describe('InQueueManager', () => {
  let output = 0;
  let userId: string | null | undefined;

  const newTracker = (trackerId: string): any => {
    let attribute = 10;
    return {
      id: trackerId,
      enableActivityTracking: function ({ n }: { n: number }) {
        attribute += n;
      },
      setVisitorCookieTimeout: function ({ p }: { p: number }) {
        attribute = p;
      },
      setUserId: function (s?: string | null) {
        userId = s;
      },
      trackPageView: function () {
        output = attribute;
      },
      updatePageActivity: function () {
        output += attribute;
      },
    };
  };

  const mockTrackers: Record<string, any> = {};
  mockNewTracker.mockImplementation((name: string) => {
    mockTrackers[name] = newTracker(name);
    return mockTrackers[name];
  });

  mockGetTrackers.mockImplementation((_: Array<string>) => {
    return Object.values(mockTrackers);
  });

  mockEnableActivityTracking.mockImplementation(function (event: { n: number }, trackers: string[]) {
    trackers.forEach((t) => {
      mockTrackers[t].enableActivityTracking(event);
    });
  });

  mockSetVisitorCookieTimeout.mockImplementation(function (event: { p: number }, trackers: string[]) {
    trackers.forEach((t) => {
      mockTrackers[t].setVisitorCookieTimeout(event);
    });
  });

  mockTrackPageView.mockImplementation(function (trackers: string[]) {
    trackers.forEach((t) => {
      mockTrackers[t].trackPageView();
    });
  });

  mockUpdatePageActivity.mockImplementation(function (trackers: string[]) {
    trackers.forEach((t) => {
      mockTrackers[t].updatePageActivity();
    });
  });

  mockSetUserId.mockImplementation(function (userId: string | null | undefined, trackers: string[]) {
    trackers.forEach((t) => {
      mockTrackers[t].setUserId(userId);
    });
  });

  mockIsFunction.mockImplementation(function (func: any) {
    if (func && typeof func === 'function') {
      return true;
    }
    return false;
  });

  const asyncQueueOps = [
    ['newTracker', 'firstTracker', 'firstEndpoint'],
    ['enableActivityTracking', { n: 5 }],
    ['trackPageView'],
  ];
  const asyncQueue = InQueueManager('snowplow', asyncQueueOps);

  it('Make a proxy, Function originally stored in asyncQueue is executed when asyncQueue becomes an AsyncQueueProxy', () => {
    expect(output).toEqual(15);
  });

  it('Add to asyncQueue after conversion, Function added to asyncQueue after it becomes an AsyncQueueProxy is executed', () => {
    asyncQueue.push(['setVisitorCookieTimeout', { p: 7 }]);
    asyncQueue.push(['trackPageView']);
    expect(output).toEqual(7);
  });

  it('Set UserId to String, null and undefined', () => {
    asyncQueue.push(['setUserId', 'snow123']);
    expect(userId).toEqual('snow123');

    asyncQueue.push(['setUserId', null]);
    expect(userId).toEqual(null);

    asyncQueue.push(['setUserId', undefined]);
    expect(userId).toEqual(undefined);
  });

  it("Backward compatibility: Create a tracker using the legacy setCollectorUrl method, A second tracker is created and both trackers' attributes are added to output", () => {
    asyncQueue.push(['newTracker', 'secondTracker', 'secondEndpoint']);
    asyncQueue.push(['updatePageActivity']);
    expect(output).toEqual(24);
  });

  it("Use 'function:tracker1;tracker2' syntax to control which trackers execute which functions, Set the attributes of the two trackers individually, then add both to output", () => {
    asyncQueue.push(['setVisitorCookieTimeout:firstTracker', { p: 2 }]);
    asyncQueue.push(['setVisitorCookieTimeout:secondTracker', { p: 3 }]);
    asyncQueue.push(['updatePageActivity:firstTracker;secondTracker']);
    expect(output).toEqual(29);
  });

  it('Execute a user-defined custom callback', () => {
    let callbackExecuted = false;
    asyncQueue.push([
      function () {
        callbackExecuted = true;
      },
    ]);
    expect(callbackExecuted).toBe(true);
  });

  it('Executing a custom callback that errors should not throw', () => {
    expect(() => {
      asyncQueue.push([
        function () {
          throw 'caught error';
        },
      ]);
    }).not.toThrow();
  });
});