31 lines
692 B
TypeScript
31 lines
692 B
TypeScript
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// 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 { groupBy } from '../../util/mapUtil';
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describe('map utilities', () => {
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describe('groupBy', () => {
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it('returns an empty map when passed an empty iterable', () => {
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const fn = sinon.fake();
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assert.isEmpty(groupBy([], fn));
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sinon.assert.notCalled(fn);
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});
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it('groups the iterable', () => {
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assert.deepEqual(
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groupBy([2.3, 1.3, 2.9, 1.1, 3.4], Math.floor),
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new Map([
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[1, [1.3, 1.1]],
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[2, [2.3, 2.9]],
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[3, [3.4]],
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])
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);
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});
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});
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});
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