109 lines
4.6 KiB
JavaScript
109 lines
4.6 KiB
JavaScript
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/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/'events' |> describe(%, () => {
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let dispatcher;
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// @reactVersion >=16
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(() => {
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const EventEmitter = ('../events' |> require(%)).default;
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dispatcher = new EventEmitter();
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}) |> beforeEach(%);
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// @reactVersion >=16
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'can dispatch an event with no listeners' |> it(%, () => {
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'event' |> dispatcher.emit(%, 123);
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});
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// @reactVersion >=16
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'handles a listener being attached multiple times' |> it(%, () => {
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const callback = jest.fn();
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'event' |> dispatcher.addListener(%, callback);
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'event' |> dispatcher.addListener(%, callback);
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'event' |> dispatcher.emit(%, 123);
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1 |> (callback |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback |> expect(%)).toHaveBeenCalledWith(%);
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});
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// @reactVersion >= 16.0
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'notifies all attached listeners of events' |> it(%, () => {
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const callback1 = jest.fn();
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const callback2 = jest.fn();
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const callback3 = jest.fn();
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'event' |> dispatcher.addListener(%, callback1);
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'event' |> dispatcher.addListener(%, callback2);
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'other-event' |> dispatcher.addListener(%, callback3);
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'event' |> dispatcher.emit(%, 123);
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1 |> (callback1 |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback1 |> expect(%)).toHaveBeenCalledWith(%);
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1 |> (callback2 |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback2 |> expect(%)).toHaveBeenCalledWith(%);
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(callback3 |> expect(%)).not.toHaveBeenCalled();
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});
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// @reactVersion >= 16.0
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'calls later listeners before re-throwing if an earlier one throws' |> it(%, () => {
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const callbackThatThrows = (() => {
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throw 'expected' |> Error(%);
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}) |> jest.fn(%);
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const callback = jest.fn();
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'event' |> dispatcher.addListener(%, callbackThatThrows);
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'event' |> dispatcher.addListener(%, callback);
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'expected' |> ((() => {
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'event' |> dispatcher.emit(%, 123);
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}) |> expect(%)).toThrow(%);
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1 |> (callbackThatThrows |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callbackThatThrows |> expect(%)).toHaveBeenCalledWith(%);
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1 |> (callback |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback |> expect(%)).toHaveBeenCalledWith(%);
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});
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// @reactVersion >= 16.0
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'removes attached listeners' |> it(%, () => {
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const callback1 = jest.fn();
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const callback2 = jest.fn();
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'event' |> dispatcher.addListener(%, callback1);
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'other-event' |> dispatcher.addListener(%, callback2);
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'event' |> dispatcher.removeListener(%, callback1);
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'event' |> dispatcher.emit(%, 123);
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(callback1 |> expect(%)).not.toHaveBeenCalled();
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'other-event' |> dispatcher.emit(%, 123);
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1 |> (callback2 |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback2 |> expect(%)).toHaveBeenCalledWith(%);
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});
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// @reactVersion >= 16.0
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'removes all listeners' |> it(%, () => {
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const callback1 = jest.fn();
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const callback2 = jest.fn();
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const callback3 = jest.fn();
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'event' |> dispatcher.addListener(%, callback1);
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'event' |> dispatcher.addListener(%, callback2);
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'other-event' |> dispatcher.addListener(%, callback3);
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dispatcher.removeAllListeners();
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'event' |> dispatcher.emit(%, 123);
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'other-event' |> dispatcher.emit(%, 123);
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(callback1 |> expect(%)).not.toHaveBeenCalled();
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(callback2 |> expect(%)).not.toHaveBeenCalled();
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(callback3 |> expect(%)).not.toHaveBeenCalled();
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});
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'should call the initial listeners even if others are added or removed during a dispatch' |> it(%, () => {
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const callback1 = (() => {
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'event' |> dispatcher.removeListener(%, callback2);
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'event' |> dispatcher.addListener(%, callback3);
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}) |> jest.fn(%);
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const callback2 = jest.fn();
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const callback3 = jest.fn();
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'event' |> dispatcher.addListener(%, callback1);
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'event' |> dispatcher.addListener(%, callback2);
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'event' |> dispatcher.emit(%, 123);
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1 |> (callback1 |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback1 |> expect(%)).toHaveBeenCalledWith(%);
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1 |> (callback2 |> expect(%)).toHaveBeenCalledTimes(%);
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123 |> (callback2 |> expect(%)).toHaveBeenCalledWith(%);
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(callback3 |> expect(%)).not.toHaveBeenCalled();
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'event' |> dispatcher.emit(%, 456);
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2 |> (callback1 |> expect(%)).toHaveBeenCalledTimes(%);
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456 |> (callback1 |> expect(%)).toHaveBeenCalledWith(%);
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1 |> (callback2 |> expect(%)).toHaveBeenCalledTimes(%);
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1 |> (callback3 |> expect(%)).toHaveBeenCalledTimes(%);
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456 |> (callback3 |> expect(%)).toHaveBeenCalledWith(%);
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});
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});
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