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84 lines
2.4 KiB
JavaScript
84 lines
2.4 KiB
JavaScript
import mock from 'xhr-mock';
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const sideEffects = {
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document: {
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addEventListener: {
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fn: document.addEventListener,
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refs: [],
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},
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keys: Object.keys(document),
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},
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window: {
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addEventListener: {
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fn: window.addEventListener,
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refs: [],
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},
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keys: Object.keys(window),
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},
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};
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// Lifecycle Hooks
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// -----------------------------------------------------------------------------
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beforeAll(async () => {
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// Spy addEventListener
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['document', 'window'].forEach(obj => {
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const fn = sideEffects[obj].addEventListener.fn;
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const refs = sideEffects[obj].addEventListener.refs;
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function addEventListenerSpy(type, listener, options) {
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// Store listener reference so it can be removed during reset
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refs.push({ type, listener, options });
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// Call original window.addEventListener
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fn(type, listener, options);
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}
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// Add to default key arry to prevent removal during reset
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sideEffects[obj].keys.push('addEventListener');
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// Replace addEventListener with mock
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global[obj].addEventListener = addEventListenerSpy;
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});
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});
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// Reset JSDOM. This attempts to remove side effects from tests, however it does
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// not reset all changes made to globals like the the window and document
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// objects. Tests requiring a full JSDOM reset should be stored in separate
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// files, which is only way to do a complete reset of JSDOM with Jest.
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beforeEach(async () => {
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const rootElm = document.documentElement;
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// Remove attributes on root element
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[...rootElm.attributes].forEach(attr => rootElm.removeAttribute(attr.name));
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// Remove elements (faster the setting innerHTML)
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while (rootElm.firstChild) {
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rootElm.removeChild(rootElm.firstChild);
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}
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// Remove global listeners and keys
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['document', 'window'].forEach(obj => {
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const refs = sideEffects[obj].addEventListener.refs;
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// Listeners
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while (refs.length) {
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const { type, listener, options } = refs.pop();
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global[obj].removeEventListener(type, listener, options);
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}
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// Keys
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Object.keys(global[obj])
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.filter(key => !sideEffects[obj].keys.includes(key))
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.forEach(key => {
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delete global[obj][key];
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});
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});
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// Restore base elements
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rootElm.innerHTML = '<html><head></head><body></body></html>';
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});
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afterEach(async () => {
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// Restore the global XMLHttpRequest object to its original state
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mock.teardown();
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});
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