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socket-helper.test.js
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socket-helper.test.js
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'use strict';
describe('socket', () => {
afterEach(() => {
jest.resetAllMocks();
jest.resetModules();
});
it('should default to SockJSClient when no __webpack_dev_server_client__ set', () => {
jest.mock('../../client/clients/SockJSClient');
const { default: socket } = require('../../client/socket');
const SockJSClient = require('../../client/clients/SockJSClient');
const mockHandler = jest.fn();
socket('my.url', {
example: mockHandler,
});
const mockClientInstance = SockJSClient.mock.instances[0];
// this simulates recieving a message from the server and passing it
// along to the callback of onMessage
mockClientInstance.onMessage.mock.calls[0][0](
JSON.stringify({
type: 'example',
data: 'hello world',
})
);
expect(SockJSClient.mock.calls[0]).toMatchSnapshot();
expect(mockClientInstance.onOpen.mock.calls).toMatchSnapshot();
expect(mockClientInstance.onClose.mock.calls).toMatchSnapshot();
expect(mockClientInstance.onMessage.mock.calls).toMatchSnapshot();
expect(mockHandler.mock.calls).toMatchSnapshot();
});
it('should use __webpack_dev_server_client__ when set', () => {
jest.mock('../../client/clients/SockJSClient');
const { default: socket } = require('../../client/socket');
global.__webpack_dev_server_client__ = require('../../client/clients/SockJSClient');
const mockHandler = jest.fn();
socket('my.url', {
example: mockHandler,
});
const mockClientInstance =
global.__webpack_dev_server_client__.mock.instances[0];
// this simulates recieving a message from the server and passing it
// along to the callback of onMessage
mockClientInstance.onMessage.mock.calls[0][0](
JSON.stringify({
type: 'example',
data: 'hello world',
})
);
expect(
global.__webpack_dev_server_client__.mock.calls[0]
).toMatchSnapshot();
expect(mockClientInstance.onOpen.mock.calls).toMatchSnapshot();
expect(mockClientInstance.onClose.mock.calls).toMatchSnapshot();
expect(mockClientInstance.onMessage.mock.calls).toMatchSnapshot();
expect(mockHandler.mock.calls).toMatchSnapshot();
});
});