190 lines
7.9 KiB
TypeScript
190 lines
7.9 KiB
TypeScript
import { NumberExtension } from '../../../src/Utils/Extensions/NumberExtension';
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describe('NumberExtension - 数字扩展工具类测试', () => {
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describe('toNumber 方法测试', () => {
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it('应该能够转换数字类型', () => {
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expect(NumberExtension.toNumber(42)).toBe(42);
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expect(NumberExtension.toNumber(0)).toBe(0);
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expect(NumberExtension.toNumber(-42)).toBe(-42);
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expect(NumberExtension.toNumber(3.14)).toBe(3.14);
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expect(NumberExtension.toNumber(-3.14)).toBe(-3.14);
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});
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it('应该能够转换字符串数字', () => {
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expect(NumberExtension.toNumber('42')).toBe(42);
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expect(NumberExtension.toNumber('0')).toBe(0);
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expect(NumberExtension.toNumber('-42')).toBe(-42);
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expect(NumberExtension.toNumber('3.14')).toBe(3.14);
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expect(NumberExtension.toNumber('-3.14')).toBe(-3.14);
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});
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it('应该能够转换科学计数法字符串', () => {
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expect(NumberExtension.toNumber('1e5')).toBe(100000);
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expect(NumberExtension.toNumber('1.5e2')).toBe(150);
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expect(NumberExtension.toNumber('2e-3')).toBe(0.002);
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});
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it('应该能够转换十六进制字符串', () => {
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expect(NumberExtension.toNumber('0xFF')).toBe(255);
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expect(NumberExtension.toNumber('0x10')).toBe(16);
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expect(NumberExtension.toNumber('0x0')).toBe(0);
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});
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it('应该能够转换布尔值', () => {
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expect(NumberExtension.toNumber(true)).toBe(1);
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expect(NumberExtension.toNumber(false)).toBe(0);
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});
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it('undefined 和 null 应该返回0', () => {
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expect(NumberExtension.toNumber(undefined)).toBe(0);
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expect(NumberExtension.toNumber(null)).toBe(0);
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});
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it('应该能够处理空字符串和空白字符串', () => {
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expect(NumberExtension.toNumber('')).toBe(0);
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expect(NumberExtension.toNumber(' ')).toBe(0);
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expect(NumberExtension.toNumber('\t')).toBe(0);
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expect(NumberExtension.toNumber('\n')).toBe(0);
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});
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it('无效的字符串应该返回NaN', () => {
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expect(Number.isNaN(NumberExtension.toNumber('abc'))).toBe(true);
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expect(Number.isNaN(NumberExtension.toNumber('hello'))).toBe(true);
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expect(Number.isNaN(NumberExtension.toNumber('12abc'))).toBe(true);
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});
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it('应该能够转换数组（第一个元素）', () => {
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expect(NumberExtension.toNumber([42])).toBe(42);
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expect(NumberExtension.toNumber(['42'])).toBe(42);
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expect(NumberExtension.toNumber([])).toBe(0);
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});
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it('应该能够转换Date对象（时间戳）', () => {
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const date = new Date(2023, 0, 1);
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const timestamp = date.getTime();
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expect(NumberExtension.toNumber(date)).toBe(timestamp);
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});
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it('应该能够处理BigInt转换', () => {
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expect(NumberExtension.toNumber(BigInt(42))).toBe(42);
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expect(NumberExtension.toNumber(BigInt(0))).toBe(0);
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});
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it('应该能够处理Infinity和-Infinity', () => {
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expect(NumberExtension.toNumber(Infinity)).toBe(Infinity);
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expect(NumberExtension.toNumber(-Infinity)).toBe(-Infinity);
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expect(NumberExtension.toNumber('Infinity')).toBe(Infinity);
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expect(NumberExtension.toNumber('-Infinity')).toBe(-Infinity);
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});
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it('对象转换应该调用valueOf或toString', () => {
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const objWithValueOf = {
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valueOf: () => 42
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};
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expect(NumberExtension.toNumber(objWithValueOf)).toBe(42);
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const objWithToString = {
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toString: () => '123'
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};
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expect(NumberExtension.toNumber(objWithToString)).toBe(123);
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});
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it('复杂对象应该返回NaN', () => {
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const complexObj = { a: 1, b: 2 };
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expect(Number.isNaN(NumberExtension.toNumber(complexObj))).toBe(true);
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});
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it('Symbol转换应该抛出错误', () => {
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expect(() => {
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NumberExtension.toNumber(Symbol('test'));
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}).toThrow();
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});
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it('应该处理特殊数值', () => {
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expect(NumberExtension.toNumber(Number.MAX_VALUE)).toBe(Number.MAX_VALUE);
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expect(NumberExtension.toNumber(Number.MIN_VALUE)).toBe(Number.MIN_VALUE);
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expect(NumberExtension.toNumber(Number.MAX_SAFE_INTEGER)).toBe(Number.MAX_SAFE_INTEGER);
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expect(NumberExtension.toNumber(Number.MIN_SAFE_INTEGER)).toBe(Number.MIN_SAFE_INTEGER);
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});
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it('应该处理parseFloat可解析的字符串', () => {
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// NumberExtension.toNumber使用Number()，不支持parseFloat的部分解析
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expect(Number.isNaN(NumberExtension.toNumber('42.5px'))).toBe(true);
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expect(Number.isNaN(NumberExtension.toNumber('100%'))).toBe(true);
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expect(Number.isNaN(NumberExtension.toNumber('3.14em'))).toBe(true);
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});
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it('边界情况测试', () => {
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// 非常大的数字
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expect(NumberExtension.toNumber('1e308')).toBe(1e308);
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// 非常小的数字
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expect(NumberExtension.toNumber('1e-308')).toBe(1e-308);
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// 精度问题
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expect(NumberExtension.toNumber('0.1')).toBe(0.1);
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expect(NumberExtension.toNumber('0.2')).toBe(0.2);
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});
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it('应该处理带符号的字符串', () => {
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expect(NumberExtension.toNumber('+42')).toBe(42);
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expect(NumberExtension.toNumber('+3.14')).toBe(3.14);
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expect(NumberExtension.toNumber('-0')).toBe(-0);
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});
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it('应该处理八进制字符串（不推荐使用）', () => {
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// 注意：现代JavaScript中八进制字面量是不推荐的
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expect(NumberExtension.toNumber('010')).toBe(10); // 被当作十进制处理
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});
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it('性能测试 - 大量转换应该高效', () => {
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const testValues = [42, '123', true, null, undefined, '3.14'];
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const startTime = performance.now();
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for (let i = 0; i < 10000; i++) {
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testValues.forEach(value => {
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NumberExtension.toNumber(value);
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});
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}
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const endTime = performance.now();
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expect(endTime - startTime).toBeLessThan(100); // 应该在100ms内完成
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});
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});
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describe('类型兼容性测试', () => {
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it('应该与Number()函数行为一致', () => {
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const testValues = [
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42, '42', true, false, '', ' ',
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'3.14', 'abc', [], [42], {}, Infinity, -Infinity
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];
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testValues.forEach(value => {
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const extensionResult = NumberExtension.toNumber(value);
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const nativeResult = Number(value);
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if (Number.isNaN(extensionResult) && Number.isNaN(nativeResult)) {
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// 两个都是NaN，认为相等
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expect(true).toBe(true);
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} else {
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expect(extensionResult).toBe(nativeResult);
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}
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});
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// 特殊处理null和undefined的情况
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expect(NumberExtension.toNumber(null)).toBe(0);
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expect(NumberExtension.toNumber(undefined)).toBe(0);
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expect(Number(null)).toBe(0);
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expect(Number(undefined)).toBeNaN();
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});
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it('应该正确处理特殊的相等性', () => {
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// -0 和 +0
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expect(Object.is(NumberExtension.toNumber('-0'), -0)).toBe(true);
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expect(Object.is(NumberExtension.toNumber('+0'), +0)).toBe(true);
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// NaN
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expect(Number.isNaN(NumberExtension.toNumber('notANumber'))).toBe(true);
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});
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});
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}); |