51 lines
1.5 KiB
TypeScript
51 lines
1.5 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { assert } from 'chai';
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import * as sinon from 'sinon';
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import { waitForOnline } from '../../util/waitForOnline';
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describe('waitForOnline', () => {
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function getFakeWindow(): EventTarget {
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const result = new EventTarget();
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sinon.stub(result, 'addEventListener');
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sinon.stub(result, 'removeEventListener');
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return result;
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}
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it("resolves immediately if you're online", async () => {
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const fakeNavigator = { onLine: true };
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const fakeWindow = getFakeWindow();
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await waitForOnline(fakeNavigator, fakeWindow);
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sinon.assert.notCalled(fakeWindow.addEventListener as sinon.SinonStub);
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sinon.assert.notCalled(fakeWindow.removeEventListener as sinon.SinonStub);
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});
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it("if you're offline, resolves as soon as you're online", async () => {
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const fakeNavigator = { onLine: false };
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const fakeWindow = getFakeWindow();
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(fakeWindow.addEventListener as sinon.SinonStub)
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.withArgs('online')
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.callsFake((_eventName: string, callback: () => void) => {
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setTimeout(callback, 0);
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});
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let done = false;
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const promise = (async () => {
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await waitForOnline(fakeNavigator, fakeWindow);
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done = true;
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})();
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assert.isFalse(done);
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await promise;
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assert.isTrue(done);
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sinon.assert.calledOnce(fakeWindow.addEventListener as sinon.SinonStub);
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sinon.assert.calledOnce(fakeWindow.removeEventListener as sinon.SinonStub);
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});
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});
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