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Validating Browser Integration and Core Date Operations in dayjs

This test suite validates the browser-specific functionality of the dayjs library, focusing on installation verification and core API functionality. The tests ensure proper window object integration and date manipulation methods work correctly in browser environments.

Test Coverage Overview

The test suite covers two main areas: installation verification and core API functionality. Key test cases include:

Window object integration verification
Method chaining functionality
Date parsing with non-standard formats
Edge cases in date manipulation and formatting

Implementation Analysis

The testing approach employs a describe-it pattern typical of modern JavaScript testing frameworks. The implementation demonstrates:

Nested describe blocks for logical test organization
Chainable method testing with complex operations
Format string validation
Cross-browser compatibility considerations

Technical Details

Testing infrastructure includes:

ESLint configuration for consistent code style
Browser-specific test runner setup
Expect-style assertions
ISO date string handling
Custom format string parsing

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases with clear descriptions
Comprehensive method chain testing
Edge case handling for date parsing
Clear test case organization
Documentation through descriptive test names

iamkun/dayjs

test/browser.spec.js

            
/* eslint-disable prefer-arrow-callback,func-names */
// Please do NOT modify or change this file
// Checkout our unit test files in test/*.test.js
describe('Install', function () {
  it('window.dayjs ', function () {
    if (!window.dayjs) throw new Error('No window.dayjs')
  })
})

describe('Core APIs', function () {
  it('Chain Methods', function () {
    expect(dayjs('2011-02-05T14:48:00.000Z')
      .clone()
      .set('month', 3)
      .set('second', 30)
      .endOf('month')
      .startOf('week')
      .add(1, 'day')
      .subtract(1, 'year')
      .format('{YYYY} MM-DDTHH:mm:ss')).toBe('{2010} 04-25T00:00:00')
  })

  it('Date parse - nonstandard date string', function () {
    expect(dayjs('2018-4-1 1:1:1:22').format('YYYY-MM-DD hh:mm:ss'))
      .toBe('2018-04-01 01:01:01')
    expect(dayjs('2018-4-1').format('YYYY-MM-DD hh:mm:ss'))
      .toBe('2018-04-01 12:00:00')
    expect(dayjs('2018-4-1 11:49').format('YYYY-MM-DD hh:mm:ss')) // fix ios bug
      .toBe('2018-04-01 11:49:00')
  })
})