56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
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import { describe, expect, it } from 'vitest';
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import { capitalizeFirstLetter, toLowerCaseFirstLetter } from './letter';
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// 编写测试用例
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describe('capitalizeFirstLetter', () => {
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it('should capitalize the first letter of a string', () => {
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expect(capitalizeFirstLetter('hello')).toBe('Hello');
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expect(capitalizeFirstLetter('world')).toBe('World');
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});
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it('should handle empty strings', () => {
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expect(capitalizeFirstLetter('')).toBe('');
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});
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it('should handle single character strings', () => {
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expect(capitalizeFirstLetter('a')).toBe('A');
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expect(capitalizeFirstLetter('b')).toBe('B');
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});
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it('should not change the case of other characters', () => {
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expect(capitalizeFirstLetter('hElLo')).toBe('HElLo');
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});
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});
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describe('toLowerCaseFirstLetter', () => {
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it('should convert the first letter to lowercase', () => {
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expect(toLowerCaseFirstLetter('CommonAppName')).toBe('commonAppName');
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expect(toLowerCaseFirstLetter('AnotherKeyExample')).toBe(
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'anotherKeyExample',
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);
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});
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it('should return the same string if the first letter is already lowercase', () => {
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expect(toLowerCaseFirstLetter('alreadyLowerCase')).toBe('alreadyLowerCase');
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});
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it('should handle empty strings', () => {
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expect(toLowerCaseFirstLetter('')).toBe('');
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});
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it('should handle single character strings', () => {
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expect(toLowerCaseFirstLetter('A')).toBe('a');
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expect(toLowerCaseFirstLetter('a')).toBe('a');
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});
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it('should handle strings with only one uppercase letter', () => {
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expect(toLowerCaseFirstLetter('A')).toBe('a');
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});
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it('should handle strings with special characters', () => {
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expect(toLowerCaseFirstLetter('!Special')).toBe('!Special');
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expect(toLowerCaseFirstLetter('123Number')).toBe('123Number');
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});
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});
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