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Testing Arabic Locale Meridiem Formatting in dayjs

This test suite validates the Arabic (Algeria) locale implementation in Day.js, focusing on meridiem (AM/PM) formatting. It ensures correct time period indicators for different hours of the day using the ar-dz locale settings.

Test Coverage Overview

The test suite provides comprehensive coverage of meridiem formatting for the Arabic (Algeria) locale.

Key areas tested include:

Morning time period formatting (ص)
Afternoon/evening time period formatting (م)
Boundary cases at different hours
Locale-specific time format handling

Implementation Analysis

The testing approach uses Jest’s unit testing framework with MockDate for consistent time-based testing. The implementation follows a structured pattern of setting up test conditions, executing locale-specific formatting, and verifying expected outputs.

Notable patterns include:

Plugin extension for relative time functionality
Locale switching between test cases
Consistent datetime string formatting

Technical Details

Testing infrastructure includes:

Jest testing framework
MockDate for date manipulation
Day.js core library
RelativeTime plugin
Arabic (Algeria) locale module

Configuration includes beforeEach and afterEach hooks for date mocking management.

Best Practices Demonstrated

The test suite exemplifies several testing best practices including isolation of test cases, consistent setup and teardown procedures, and clear test descriptions.

Quality aspects include:

Proper test isolation using MockDate
Consistent assertion patterns
Clear test case organization
Comprehensive locale testing approach

iamkun/dayjs

test/locale/ar-dz.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-dz'

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-dz').format('A')).toEqual('ص')
  expect(dayjs('2020-01-01 11:00:00').locale('ar-dz').format('A')).toEqual('ص')
  expect(dayjs('2020-01-01 16:00:00').locale('ar-dz').format('A')).toEqual('م')
  expect(dayjs('2020-01-01 20:00:00').locale('ar-dz').format('A')).toEqual('م')
})