Back to Repositories

Testing Date Comparison Plugin Functionality in dayjs

This test suite evaluates the isToday plugin functionality in the dayjs library. It verifies the accuracy of date comparison operations by testing whether given dates match the current day. The suite uses MockDate for consistent date manipulation during testing.

Test Coverage Overview

The test coverage focuses on validating the isToday plugin’s core date comparison functionality.

Tests both positive and negative cases for date comparison
Verifies current date detection
Includes historical date validation
Ensures accurate boolean return values

Implementation Analysis

The testing approach employs Jest’s testing framework with MockDate for reliable date manipulation.

The implementation utilizes beforeEach and afterEach hooks for test isolation, ensuring consistent date contexts across test runs. The pattern demonstrates proper plugin extension and method validation.

Technical Details

Jest testing framework
MockDate library for date manipulation
dayjs plugin architecture
BeforeEach/AfterEach hooks
Assertion-based testing patterns

Best Practices Demonstrated

The test suite exemplifies several testing best practices in JavaScript unit testing.

Proper test isolation using mock date management
Clear test case organization
Effective use of setup and teardown procedures
Concise and focused test assertions
Comprehensive positive and negative testing

iamkun/dayjs

test/plugin/isToday.test.js

            
import MockDate from 'mockdate'
import dayjs from '../../src'
import isToday from '../../src/plugin/isToday'

dayjs.extend(isToday)

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

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

it('is today', () => {
  expect(dayjs(new Date()).isToday()).toBeTruthy()
  expect(dayjs('2017-01-01').isToday()).toBeFalsy()
})