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62 lines
2.2 KiB
62 lines
2.2 KiB
describe('Number', function () {
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'use strict';
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describe('#toFixed()', function () {
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it('should convert numbers correctly', function () {
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expect((0.00008).toFixed(3)).toBe('0.000');
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expect((0.9).toFixed(0)).toBe('1');
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expect((1.255).toFixed(2)).toBe('1.25');
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expect((1843654265.0774949).toFixed(5)).toBe('1843654265.07749');
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expect((1000000000000000128).toFixed(0)).toBe('1000000000000000128');
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});
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});
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describe('#toPrecision()', function () {
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// the spec allows for this test to fail.
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it('throws a RangeError when < 1 or > 21 (or > 100 in ES2018+)', function () {
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expect(function () { return (0.9).toPrecision(0); }).toThrow();
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expect(function () {
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return [
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(0.9).toPrecision(22), // ES2018 increased the limit from 21 to 100
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(0.9).toPrecision(101)
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];
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}).toThrow();
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});
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it('works as expected', function () {
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expect((0.00008).toPrecision(3)).toBe('0.0000800');
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expect((1.255).toPrecision(2)).toBe('1.3');
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expect((1843654265.0774949).toPrecision(13)).toBe('1843654265.077');
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expect(NaN.toPrecision(1)).toBe('NaN');
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});
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it('works with an undefined precision', function () {
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var num = 123.456;
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expect(num.toPrecision()).toBe(String(num));
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expect(num.toPrecision(undefined)).toBe(String(num));
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});
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});
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describe('constants', function () {
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it('should have MAX_VALUE', function () {
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expect(Number.MAX_VALUE).toBe(1.7976931348623157e308);
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});
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it('should have MIN_VALUE', function () {
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expect(Number.MIN_VALUE).toBe(5e-324);
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});
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it('should have NaN', function () {
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expect(Number.NaN).not.toBe(Number.NaN);
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});
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it('should have POSITIVE_INFINITY', function () {
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expect(Number.POSITIVE_INFINITY).toBe(Infinity);
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});
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it('should have NEGATIVE_INFINITY', function () {
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expect(Number.NEGATIVE_INFINITY).toBe(-Infinity);
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});
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});
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});
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