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Testing Chinese Traditional Locale Implementation in dayjs

This test suite validates the Chinese Traditional (zh-tw) locale implementation in Day.js, focusing on ordinal formatting and meridiem handling. It ensures proper localization of week numbers and time-of-day indicators.

Test Coverage Overview

The test suite provides comprehensive coverage of zh-tw locale-specific functionality in Day.js.

Key areas tested include:

Ordinal formatting for week numbers with correct Traditional Chinese characters
24-hour meridiem (AM/PM) formatting comparison between zh and zh-tw locales
Edge cases across full 24-hour cycle

Implementation Analysis

The testing approach employs Jest’s test framework with isolated test cases for each localization feature. The implementation uses Day.js plugins (advancedFormat, weekOfYear) and compares zh-tw against base zh locale behavior.

Testing patterns include:

Direct string comparison for formatted output
Iterative testing across time ranges
Plugin extension verification

Technical Details

Testing infrastructure includes:

Jest as the primary testing framework
Day.js core library and locale modules
Advanced Format plugin for extended formatting options
Week of Year plugin for week number calculations
Dynamic locale switching capabilities

Best Practices Demonstrated

The test suite exemplifies high-quality testing practices through focused test cases and thorough validation.

Notable practices include:

Isolated locale testing
Comprehensive time range verification
Plugin integration testing
Clear test case organization
Efficient comparison methodology

iamkun/dayjs

test/locale/zh-tw.test.js

            
import dayjs from '../../src'
import advancedFormat from '../../src/plugin/advancedFormat'
import weekOfYear from '../../src/plugin/weekOfYear'
import '../../src/locale/zh'
import '../../src/locale/zh-tw'

dayjs.extend(advancedFormat).extend(weekOfYear)

const zh = dayjs().locale('zh')
const zhTW = dayjs().locale('zh-tw')

test('ordinal', () => {
  expect(zh.format('wo')).toEqual(`${zh.format('w')}周`)
  expect(zhTW.format('wo')).toEqual(`${zhTW.format('w')}週`)
})

test('Meridiem', () => {
  for (let i = 0; i <= 24; i += 1) {
    expect(zh.add(i, 'hour').format('A')).toBe(zhTW.add(i, 'hour').format('A'))
  }
})