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`eventsourcemock` [![Build Status](https://travis-ci.org/gcedo/eventsourcemock.svg?branch=master)](https://travis-ci.org/gcedo/eventsourcemock)\n\nA dependency free mock for EventSource objects.\n\n\n## Example (with Jest)\n### Setup\nTo setup the mock create a new file where the mock is assigned to the `window` object.\n\n```js\n// __test__/configJSDom.js\nimport EventSource from 'eventsourcemock';\n\nObject.defineProperty(window, 'EventSource', {\n  value: EventSource,\n});\n```\n[Then instruct Jest to use that file during setup in `package.json`](https://facebook.github.io/jest/docs/configuration.html#setupfiles-array).\n```json\n\"jest\": {\n  \"setupFiles\": [\n    \"./__test__/configJSDom.js\"\n  ]\n}\n```\n\n### Usage\nSuppose we want to test this component, which updates its state when a message is received from an `EventSource` instance.\n\n```js\nexport default class Component extends React.Component {\n  props: Props;\n  state: State;\n  source: $PropertyType\u003cwindow, 'EventSource'\u003e;\n\n  constructor(props: Props) {\n    super(props);\n    this.state = {\n      counter: 0,\n    };\n  }\n\n  componentDidMount() {\n    this.source = new window.EventSource('http://example.com/events');\n    this.source.addEventListener('foo', messageEvent =\u003e {\n      this.setState({ counter: parseInt(messageEvent.data, 10) });\n    });\n  }\n\n  componentWillUnmount() {\n    this.source.close();\n  }\n\n  render() {\n    return \u003cdiv className=\"Component\"\u003e{this.state.counter}\u003c/div\u003e;\n  }\n}\n```\n\nWe can write a test file that grabs the source from the global `sources` object and simulates messages:\n\n```js\n// @flow\nimport React from 'react';\nimport { mount } from 'enzyme';\n\nimport Component from './Component';\nimport { sources } from 'eventsourcemock';\n\nconst messageEvent = new MessageEvent('foo', {\n  data: '1',\n});\n\ndescribe('update counter on SSE', () =\u003e {\n  let wrapper;\n  beforeAll(() =\u003e {\n    wrapper = mount(\u003cComponent /\u003e);\n    sources['http://example.com/events'].emitOpen();\n  });\n\n  it('should initialise counter to 0', () =\u003e {\n    expect(wrapper.state('counter')).toBe(0);\n  });\n\n  it('should display \"0\"', () =\u003e {\n    expect(wrapper.text()).toBe('0');\n  });\n\n  it('should update the counter to 1', () =\u003e {\n    sources['http://example.com/events'].emit(\n      messageEvent.type,\n      messageEvent\n    );\n    expect(wrapper.state('counter')).toBe(1);\n  });\n\n  it('should close the EventSource on unmount', () =\u003e {\n    wrapper.unmount();\n    expect(sources['http://example.com/events'].readyState).toBe(2);\n  });\n});\n\n```\n\n## API\n### `sources: { [key: string]: EventSource }`\n`sources` holds the `EventSource` instances created.\n\n```js\nimport { sources } from 'eventsourcemock';\n```\n\n### `EventSource`\n`EventSource` mocks `window.EventSource`, providing methods to simulate messages and errors from the network.\n```js\nimport EventSource from 'eventsourcemock';\n```\n#### Constructor\n```js\nEventSource(\n  url: string,\n  options?: {\n    withCredentials: boolean\n  }\n)\n```\n\n#### Properties\n##### `__emitter`\nA reference to the [node `EventEmitter`](https://nodejs.org/api/events.html#events_class_eventemitter) instance used internally.\n\n##### `onopen`\nSee [eventSource.onopen](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/onopen).\n\n##### `onmessage`\nSee [eventSource.onmessage](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/onmessage).\n\n##### `onerror`\nSee [eventSource.onerror](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/onerror).\n\n##### `readyState`\nSee [eventSource.readyState](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/readyState).\n\n##### `url`\nSee [eventSource.url](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/url).\n\n##### `withCredentials`\nSee [eventSource.withCredentials](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/withCredentials).\n\n\n#### Methods\n##### `emit(eventName: string, messageEvent?: MessageEvent)`\nCalls each of the listeners registered for the event named `eventName`, providing `messageEvent` as argument.\n\n*Example*\n```js\nconst messageEvent = new MessageEvent('type', {\n  data: 'message event data'\n});\nsource.emit(messageEvent.type, messageEvent);\n```\n\n#### `emitOpen()`\nSimulates the opening of a connection. It sets the ready state to open and invokes the callback.\n\n##### `emitMessage(message: any)`\nSimulates dispatching of a message, it invokes the `onmessage` callback.\n\n#### `emitError(error: Error)`\nSimulates dispatching an error event on the `EventSource` instance. Causes `onerror` to be called.\n\n*Example (jest)*\n```js\nconst onErrorSpy = jest.fn();\nconst error = new Error('Something went wrong.');\neventSource.onerror = onErrorSpy;\neventSource.emitError(error);\nexpect(onErrorSpy).toHaveBeenCalledWith(error);\n```\n\n##### `addEventListener(eventName: string, listener: Function)`\nSee [EventTarget.addEventListener](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener).\n\n##### `removeEventListener(eventName: string, listener: Function)`\nSee [EventTarget.removeEventListener](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener)\n\n##### `close()`\nSee [EventSource.close](https://developer.mozilla.org/en-US/docs/Web/API/EventSource/close).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgcedo%2Feventsourcemock","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgcedo%2Feventsourcemock","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgcedo%2Feventsourcemock/lists"}