lodash/test/isFinite.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { stubTrue, stubFalse, args, symbol } from './utils';
import isFinite from '../src/isFinite';

describe('isFinite', () => {
    it('should return `true` for finite values', () => {
        const values = [0, 1, 3.14, -1],
            expected = lodashStable.map(values, stubTrue),
            actual = lodashStable.map(values, isFinite);

        assert.deepStrictEqual(actual, expected);
    });

    it('should return `false` for non-finite values', () => {
        const values = [NaN, Infinity, -Infinity, Object(1)],
            expected = lodashStable.map(values, stubFalse),
            actual = lodashStable.map(values, isFinite);

        assert.deepStrictEqual(actual, expected);
    });

    it('should return `false` for non-numeric values', () => {
        const values = [undefined, [], true, '', ' ', '2px'],
            expected = lodashStable.map(values, stubFalse),
            actual = lodashStable.map(values, isFinite);

        assert.deepStrictEqual(actual, expected);

        assert.strictEqual(isFinite(args), false);
        assert.strictEqual(isFinite([1, 2, 3]), false);
        assert.strictEqual(isFinite(true), false);
        assert.strictEqual(isFinite(new Date()), false);
        assert.strictEqual(isFinite(new Error()), false);
        assert.strictEqual(isFinite({ a: 1 }), false);
        assert.strictEqual(isFinite(/x/), false);
        assert.strictEqual(isFinite('a'), false);
        assert.strictEqual(isFinite(symbol), false);
    });

    it('should return `false` for numeric string values', () => {
        const values = ['2', '0', '08'],
            expected = lodashStable.map(values, stubFalse),
            actual = lodashStable.map(values, isFinite);

        assert.deepStrictEqual(actual, expected);
    });
});