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Testing isMoment Plugin Type Validation in dayjs

This test suite validates the isMoment plugin functionality in Day.js, ensuring proper type checking for dayjs objects. The tests verify the plugin’s ability to distinguish between dayjs instances and regular Date objects, with mock date handling for consistent testing.

Test Coverage Overview

The test suite provides focused coverage of the isMoment plugin’s core functionality.

Tests the isMoment method for positive identification of dayjs objects
Verifies negative cases with native Date objects
Includes date mocking for consistent test execution

Implementation Analysis

The testing approach utilizes Jest’s framework features with MockDate for controlled date handling. The implementation follows a clear pattern of setup, execution, and verification.

Uses beforeEach/afterEach hooks for test isolation
Implements mock date management
Demonstrates plugin extension pattern

Technical Details

Testing infrastructure leverages:

Jest as the testing framework
MockDate library for date manipulation
Day.js plugin extension system
Assertion-based validation using expect statements

Best Practices Demonstrated

The test suite exemplifies several testing best practices.

Proper test isolation through mock date management
Clear test case organization
Explicit test setup and teardown
Focused test scope with specific assertions

iamkun/dayjs

test/plugin/isMoment.test.js

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

dayjs.extend(isMoment)

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

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

it('IsLeapYear', () => {
  expect(dayjs.isMoment(dayjs())).toBe(true)
  expect(dayjs.isMoment(new Date())).toBe(false)
})