46 lines
1.3 KiB
TypeScript
46 lines
1.3 KiB
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 { isNormalNumber } from '../../util/isNormalNumber';
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describe('isNormalNumber', () => {
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it('returns false for non-numbers', () => {
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assert.isFalse(isNormalNumber(undefined));
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assert.isFalse(isNormalNumber(null));
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assert.isFalse(isNormalNumber('123'));
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assert.isFalse(isNormalNumber(BigInt(123)));
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});
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it('returns false for Number objects, which should never be used', () => {
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// eslint-disable-next-line no-new-wrappers
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assert.isFalse(isNormalNumber(new Number(123)));
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});
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it('returns false for values that can be converted to numbers', () => {
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const obj = {
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[Symbol.toPrimitive]() {
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return 123;
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},
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};
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assert.isFalse(isNormalNumber(obj));
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});
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it('returns false for NaN', () => {
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assert.isFalse(isNormalNumber(NaN));
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});
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it('returns false for Infinity', () => {
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assert.isFalse(isNormalNumber(Infinity));
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assert.isFalse(isNormalNumber(-Infinity));
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});
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it('returns true for other numbers', () => {
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assert.isTrue(isNormalNumber(123));
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assert.isTrue(isNormalNumber(0));
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assert.isTrue(isNormalNumber(-1));
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assert.isTrue(isNormalNumber(0.12));
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});
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});
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