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79 lines
3 KiB
TypeScript
79 lines
3 KiB
TypeScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { ReactWrapper } from "enzyme";
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import EventEmitter from "events";
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export const emitPromise = (e: EventEmitter, k: string | symbol) => new Promise(r => e.once(k, r));
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const findByAttr = (attr: string) => (component: ReactWrapper, value: string) => component.find(`[${attr}="${value}"]`);
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export const findByTestId = findByAttr('data-test-id');
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export const findById = findByAttr('id');
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const findByTagAndAttr = (attr: string) =>
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(component: ReactWrapper, value: string, tag: string) =>
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component.find(`${tag}[${attr}="${value}"]`);
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export const findByTagAndTestId = findByTagAndAttr('data-test-id');
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export const flushPromises = async () => await new Promise(resolve => setTimeout(resolve));
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// with jest's modern fake timers process.nextTick is also mocked,
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// flushing promises in the normal way then waits for some advancement
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// of the fake timers
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// https://gist.github.com/apieceofbart/e6dea8d884d29cf88cdb54ef14ddbcc4?permalink_comment_id=4018174#gistcomment-4018174
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export const flushPromisesWithFakeTimers = async (): Promise<void> => {
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const promise = new Promise(resolve => process.nextTick(resolve));
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jest.advanceTimersByTime(1);
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await promise;
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};
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/**
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* Call fn before calling componentDidUpdate on a react component instance, inst.
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* @param {React.Component} inst an instance of a React component.
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* @param {number} updates Number of updates to wait for. (Defaults to 1.)
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* @returns {Promise} promise that resolves when componentDidUpdate is called on
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* given component instance.
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*/
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export function waitForUpdate(inst: React.Component, updates = 1): Promise<void> {
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return new Promise<void>((resolve, reject) => {
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const cdu = inst.componentDidUpdate;
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console.log(`Waiting for ${updates} update(s)`);
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inst.componentDidUpdate = (prevProps, prevState, snapshot) => {
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updates--;
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console.log(`Got update, ${updates} remaining`);
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if (updates == 0) {
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inst.componentDidUpdate = cdu;
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resolve();
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}
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if (cdu) cdu(prevProps, prevState, snapshot);
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};
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});
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}
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/**
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* Advance jests fake timers and Date.now mock by ms
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* Useful for testing code using timeouts or intervals
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* that also checks timestamps
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*/
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export const advanceDateAndTime = (ms: number) => {
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jest.spyOn(global.Date, 'now').mockReturnValue(Date.now() + ms);
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jest.advanceTimersByTime(ms);
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};
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