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Testing Arabic-Tunisian Locale Meridiem Formatting in dayjs

This test suite validates the Arabic (Tunisia) locale implementation in Day.js, focusing on meridiem (AM/PM) formatting functionality. The tests ensure proper time period indicators in Arabic for different hours of the day.

Test Coverage Overview

The test coverage focuses on meridiem formatting in the Arabic-Tunisian locale, verifying correct AM/PM indicators across different times of day. Key test cases include:

Morning hours (3:00, 11:00) validation for ‘ص’ indicator
Afternoon/evening hours (16:00, 20:00) validation for ‘م’ indicator
Boundary conditions between time periods

Implementation Analysis

The testing approach utilizes Jest’s assertion framework with MockDate for consistent time-based testing. The implementation follows a systematic pattern of instantiating dayjs with specific timestamps and verifying locale-specific meridiem formatting through the format(‘A’) method.

The tests leverage dayjs’s locale plugin system and relativeTime extension for comprehensive locale testing.

Technical Details

Testing tools and setup include:

Jest as the testing framework
MockDate for date mocking
Day.js core library
RelativeTime plugin integration
Arabic-Tunisia (ar-tn) locale module

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Consistent test setup and teardown using beforeEach/afterEach hooks
Isolated test cases for specific functionality
Clear test descriptions and expectations
Proper module importing and plugin extension
Systematic locale testing methodology

iamkun/dayjs

test/locale/ar-tn.test.js

            
import MockDate from 'mockdate'
import dayjs from '../../src'
import relativeTime from '../../src/plugin/relativeTime'
import '../../src/locale/ru'
import locale from '../../src/locale/ar-tn'

dayjs.extend(relativeTime)

beforeEach(() => {
  MockDate.set(new Date())
})

afterEach(() => {
  MockDate.reset()
})

it('Meridiem', () => {
  dayjs.locale(locale)
  expect(dayjs('2020-01-01 03:00:00').locale('ar-tn').format('A')).toEqual('ص')
  expect(dayjs('2020-01-01 11:00:00').locale('ar-tn').format('A')).toEqual('ص')
  expect(dayjs('2020-01-01 16:00:00').locale('ar-tn').format('A')).toEqual('م')
  expect(dayjs('2020-01-01 20:00:00').locale('ar-tn').format('A')).toEqual('م')
})