video.js/test/unit/plugin-advanced.test.js

/* eslint-env qunit */
import sinon from 'sinon';
import Plugin from '../../src/js/plugin';
import TestHelpers from './test-helpers';

QUnit.module('Plugin: advanced', {

  beforeEach() {
    this.player = TestHelpers.makePlayer();
    const spy = this.spy = sinon.spy();

    class MockPlugin extends Plugin {

      constructor(...args) {
        super(...args);
        spy.apply(this, args);
      }
    }

    this.MockPlugin = MockPlugin;
    Plugin.registerPlugin('mock', MockPlugin);
  },

  afterEach() {
    this.player.dispose();

    Object.keys(Plugin.getPlugins()).forEach(key => {
      if (key !== Plugin.BASE_PLUGIN_NAME) {
        Plugin.deregisterPlugin(key);
      }
    });
  }
});

QUnit.test('pre-setup interface', function(assert) {
  assert.strictEqual(typeof this.player.plugin, 'undefined', 'the base Plugin does not add a method to the player');
  assert.strictEqual(typeof this.player.mock, 'function', 'plugins are a factory function on a player');
  assert.ok(this.player.hasPlugin('mock'), 'player has the plugin available');
  assert.strictEqual(this.player.mock.dispose, undefined, 'class-based plugins are not populated on a player until the factory method creates them');
  assert.notOk(this.player.usingPlugin('mock'), 'the player is not using the plugin');
});

QUnit.test('setup', function(assert) {
  const instance = this.player.mock({foo: 'bar'}, 123);

  assert.strictEqual(this.spy.callCount, 1, 'plugin was set up once');
  assert.strictEqual(this.spy.firstCall.thisValue, instance, 'plugin constructor `this` value was the instance');
  assert.deepEqual(this.spy.firstCall.args, [this.player, {foo: 'bar'}, 123], 'plugin had the correct arguments');
  assert.ok(this.player.usingPlugin('mock'), 'player now recognizes that the plugin was set up');
  assert.ok(this.player.hasPlugin('mock'), 'player has the plugin available');
  assert.ok(instance instanceof this.MockPlugin, 'plugin instance has the correct constructor');
  assert.strictEqual(instance, this.player.mock(), 'factory is replaced by method returning the instance');
  assert.strictEqual(instance.player, this.player, 'instance has a reference to the player');
  assert.strictEqual(instance.name, 'mock', 'instance knows its name');
  assert.strictEqual(typeof instance.state, 'object', 'instance is stateful');
  assert.strictEqual(typeof instance.setState, 'function', 'instance is stateful');
  assert.strictEqual(typeof instance.off, 'function', 'instance is evented');
  assert.strictEqual(typeof instance.on, 'function', 'instance is evented');
  assert.strictEqual(typeof instance.one, 'function', 'instance is evented');
  assert.strictEqual(typeof instance.trigger, 'function', 'instance is evented');
  assert.strictEqual(typeof instance.dispose, 'function', 'instance has dispose method');

  assert.throws(
    () => new Plugin(this.player),
    new Error('Plugin must be sub-classed; not directly instantiated.'),
    'the Plugin class cannot be directly instantiated'
  );
});

QUnit.test('all "pluginsetup" events', function(assert) {
  const setupSpy = sinon.spy();
  const events = [
    'beforepluginsetup',
    'beforepluginsetup:mock',
    'pluginsetup',
    'pluginsetup:mock'
  ];

  this.player.on(events, setupSpy);

  const instance = this.player.mock();

  events.forEach((type, i) => {
    const event = setupSpy.getCall(i).args[0];
    const hash = setupSpy.getCall(i).args[1];

    assert.strictEqual(event.type, type, `the "${type}" event was triggered`);
    assert.strictEqual(event.target, this.player.el_, 'the event has the correct target');

    assert.deepEqual(hash, {
      name: 'mock',

      // The "before" events have a `null` instance and the others have the
      // return value of the plugin factory.
      instance: i < 2 ? null : instance,
      plugin: this.MockPlugin
    }, 'the event hash object is correct');
  });
});

QUnit.test('defaultState static property is used to populate state', function(assert) {
  class DefaultStateMock extends Plugin {}
  DefaultStateMock.defaultState = {foo: 1, bar: 2};
  Plugin.registerPlugin('dsm', DefaultStateMock);

  const instance = this.player.dsm();

  assert.deepEqual(instance.state, {foo: 1, bar: 2}, 'the plugin state has default properties');
});

QUnit.test('dispose', function(assert) {
  const instance = this.player.mock();

  instance.dispose();

  assert.notOk(this.player.usingPlugin('mock'), 'player recognizes that the plugin is NOT set up');
  assert.ok(this.player.hasPlugin('mock'), 'player still has the plugin available');
  assert.strictEqual(typeof this.player.mock, 'function', 'instance is replaced by factory');
  assert.notStrictEqual(instance, this.player.mock, 'instance is replaced by factory');
  assert.strictEqual(instance.player, null, 'instance no longer has a reference to the player');
  assert.strictEqual(instance.state, null, 'state is now null');
});

QUnit.test('"dispose" event', function(assert) {
  const disposeSpy = sinon.spy();
  const instance = this.player.mock();

  instance.on('dispose', disposeSpy);
  instance.dispose();

  assert.strictEqual(disposeSpy.callCount, 1, 'the "dispose" event was triggered');

  const event = disposeSpy.firstCall.args[0];
  const hash = disposeSpy.firstCall.args[1];

  assert.strictEqual(event.type, 'dispose', 'the event has the correct type');
  assert.strictEqual(event.target, instance.eventBusEl_, 'the event has the correct target');

  assert.deepEqual(hash, {
    name: 'mock',
    instance,
    plugin: this.MockPlugin
  }, 'the event hash object is correct');
});

QUnit.test('arbitrary events', function(assert) {
  const fooSpy = sinon.spy();
  const instance = this.player.mock();

  instance.on('foo', fooSpy);
  instance.trigger('foo');

  const event = fooSpy.firstCall.args[0];
  const hash = fooSpy.firstCall.args[1];

  assert.strictEqual(fooSpy.callCount, 1, 'the "foo" event was triggered');
  assert.strictEqual(event.type, 'foo', 'the event has the correct type');
  assert.strictEqual(event.target, instance.eventBusEl_, 'the event has the correct target');

  assert.deepEqual(hash, {
    name: 'mock',
    instance,
    plugin: this.MockPlugin
  }, 'the event hash object is correct');
});

QUnit.test('handleStateChanged() method is automatically bound to the "statechanged" event', function(assert) {
  const spy = sinon.spy();

  class TestHandler extends Plugin {}
  TestHandler.prototype.handleStateChanged = spy;
  Plugin.registerPlugin('testHandler', TestHandler);

  const instance = this.player.testHandler();

  instance.setState({foo: 1});
  assert.strictEqual(spy.callCount, 1, 'the handleStateChanged listener was called');
  assert.strictEqual(spy.firstCall.args[0].type, 'statechanged', 'the event was "statechanged"');
  assert.strictEqual(typeof spy.firstCall.args[0].changes, 'object', 'the event included a changes object');
});