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Validating Array Support Date Parsing in Day.js

This test suite validates the array support plugin functionality in Day.js by comparing its behavior with Moment.js. It focuses on parsing date arrays in both local and UTC formats, ensuring consistent date handling across different input patterns.

Test Coverage Overview

The test suite provides comprehensive coverage for array-based date parsing functionality.

Key areas tested include:

Empty array handling in both local and UTC modes
Various array formats with different date components
Direct comparison with Moment.js output
Multiple date component combinations from year-only to millisecond precision

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for structured test organization. Each test case uses direct comparison between Day.js and Moment.js output to ensure compatibility.

Notable patterns include:

MockDate usage for consistent date testing
Array iteration testing with forEach
Plugin extension verification
Parallel local and UTC testing structures

Technical Details

Testing infrastructure includes:

Jest as the testing framework
MockDate for date manipulation
Day.js plugin system integration
Moment.js for comparison validation
UTC plugin for timezone handling
Array support plugin for date array parsing

Best Practices Demonstrated

The test suite exemplifies several testing best practices.

Notable examples include:

Consistent test setup and teardown with beforeEach/afterEach
Systematic test case organization
Comprehensive edge case coverage
Clear test descriptions
Efficient test case reuse through arrays
Direct feature parity testing with reference implementation

iamkun/dayjs

test/plugin/arraySupport.test.js

            
import MockDate from 'mockdate'
import moment from 'moment'
import dayjs from '../../src'
import arraySupport from '../../src/plugin/arraySupport'
import utc from '../../src/plugin/utc'

dayjs.extend(utc)
dayjs.extend(arraySupport)

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

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

describe('parse empty array', () => {
  it('local', () => {
    expect(dayjs([]).format())
      .toBe(moment([]).format())
  })
  it('utc', () => {
    expect(dayjs.utc([]).format())
      .toBe(moment.utc([]).format())
  })
})

const testArrs = [
  [2010, 1, 14, 15, 25, 50, 125],
  [2010],
  [2010, 6],
  [2010, 6, 10]
]

describe('parse array local', () => {
  testArrs.forEach((testArr) => {
    it(testArr, () => {
      expect(dayjs(testArr).format())
        .toBe(moment(testArr).format())
    })
  })
})

describe('parse array utc', () => {
  testArrs.forEach((testArr) => {
    it(testArr, () => {
      expect(dayjs.utc(testArr).format())
        .toBe(moment.utc(testArr).format())
    })
  })
})