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                        - import { validPassword } from './index'
 - 
 - describe('validPassword Tests', () => {
 -   const passwordRegex = validPassword
 - 
 -   // Valid passwords
 -   test('Valid passwords: contains letter+digit, length ≥8', () => {
 -     expect(passwordRegex.test('password1')).toBe(true)
 -     expect(passwordRegex.test('PASSWORD1')).toBe(true)
 -     expect(passwordRegex.test('12345678a')).toBe(true)
 -     expect(passwordRegex.test('a1b2c3d4')).toBe(true)
 -     expect(passwordRegex.test('VeryLongPassword123')).toBe(true)
 -     expect(passwordRegex.test('short1')).toBe(false)
 -   })
 - 
 -   // Missing letter
 -   test('Invalid passwords: missing letter', () => {
 -     expect(passwordRegex.test('12345678')).toBe(false)
 -     expect(passwordRegex.test('!@#$%^&*123')).toBe(false)
 -   })
 - 
 -   // Missing digit
 -   test('Invalid passwords: missing digit', () => {
 -     expect(passwordRegex.test('password')).toBe(false)
 -     expect(passwordRegex.test('PASSWORD')).toBe(false)
 -     expect(passwordRegex.test('AbCdEfGh')).toBe(false)
 -   })
 - 
 -   // Too short
 -   test('Invalid passwords: less than 8 characters', () => {
 -     expect(passwordRegex.test('pass1')).toBe(false)
 -     expect(passwordRegex.test('abc123')).toBe(false)
 -     expect(passwordRegex.test('1a')).toBe(false)
 -   })
 - 
 -   // Boundary test
 -   test('Boundary test: exactly 8 characters', () => {
 -     expect(passwordRegex.test('abc12345')).toBe(true)
 -     expect(passwordRegex.test('1abcdefg')).toBe(true)
 -   })
 - 
 -   // Special characters
 -   test('Special characters: non-whitespace special chars allowed', () => {
 -     expect(passwordRegex.test('pass@123')).toBe(true)
 -     expect(passwordRegex.test('p@$$w0rd')).toBe(true)
 -     expect(passwordRegex.test('!1aBcDeF')).toBe(true)
 -   })
 - 
 -   // Contains whitespace
 -   test('Invalid passwords: contains whitespace', () => {
 -     expect(passwordRegex.test('pass word1')).toBe(false)
 -     expect(passwordRegex.test('password1 ')).toBe(false)
 -     expect(passwordRegex.test(' password1')).toBe(false)
 -     expect(passwordRegex.test('pass\tword1')).toBe(false)
 -   })
 - })
 
 
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