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Testing Locale Resolution Workflow in dcloudio/uni-app

This test suite validates the locale resolution functionality in the uni-app i18n module. It ensures proper mapping of language codes to their standardized formats and handles various locale string patterns correctly.

Test Coverage Overview

The test suite provides comprehensive coverage of locale resolution scenarios.

Key areas tested include:

Basic Chinese locale mapping (zh to zh-Hans)
Regional Chinese variants (zh-CN)
English locale normalization
Generic locale pattern matching

Edge cases covered include underscore vs hyphen separators and multi-segment locale strings.

Implementation Analysis

The testing approach uses Jest’s describe/test pattern for organized test grouping. Each test case validates specific locale resolution rules using expect().toBe() assertions for exact string matching.

The implementation leverages Jest’s isolated test scope and employs both global and local resolveLocale configurations to test different locale arrays.

Technical Details

Testing tools and setup:

Jest as the testing framework
TypeScript for type-safe test implementation
Import of predefined locale constants
resolveLocale utility function with locale array configuration

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Descriptive test case naming using clear patterns
Isolated test scenarios for each locale resolution rule
Consistent assertion patterns
Multiple assertions within related test cases
Clear separation of test setup and assertions

dcloudio/uni-app

packages/uni-i18n/__tests__/locale.spec.ts

            
import {
  LOCALE_EN,
  LOCALE_ES,
  LOCALE_FR,
  LOCALE_ZH_HANS,
  LOCALE_ZH_HANT,
} from '../src/I18n'

import { resolveLocale } from '../src/locale'
const resolve = resolveLocale([
  LOCALE_ZH_HANS,
  LOCALE_ZH_HANT,
  LOCALE_EN,
  LOCALE_ES,
  LOCALE_FR,
])
describe('resolveLocale', () => {
  test('zh=>zh-Hans', () => {
    expect(resolve('zh')).toBe('zh-Hans')
  })
  test('zh-CN=>zh-Hans', () => {
    expect(resolve('zh-CN')).toBe('zh-Hans')
    expect(resolve('zh_CN')).toBe('zh-Hans')
  })
  test('en-US=>en', () => {
    expect(resolve('en-US')).toBe('en')
    expect(resolveLocale(['en'])('en-US')).toBe('en')
  })
  test('a-b-c=>a-b', () => {
    expect(resolveLocale(['a-b', 'a'])('a-b-c')).toBe('a-b')
  })
})