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Testing Request Inspection Implementation in Koa.js

This test suite validates the request inspection functionality in Koa.js, focusing on the req.inspect() method implementation. The tests ensure proper JSON representation of request objects and handle edge cases where request data is missing.

Test Coverage Overview

The test suite provides comprehensive coverage of the request inspection mechanism.

Tests JSON representation of request objects with method, URL, and headers
Validates behavior when request.req is not present
Verifies util.inspect integration for debugging

Implementation Analysis

The testing approach uses Node’s native test framework with describe/it blocks for structured test organization. The implementation leverages test helpers for request context creation and uses assert for validation.

Modular test structure with nested describe blocks
Direct manipulation of request properties
Deep equality assertions for object comparison

Technical Details

Node.js test runner (node:test)
Custom test helpers for request context
Node’s built-in assert module
util.inspect for object inspection

Best Practices Demonstrated

The test suite exemplifies clean testing practices with clear separation of concerns and thorough edge case handling.

Isolated test cases with specific assertions
Proper test setup and cleanup
Comprehensive object comparison
Error case validation

koajs/koa

__tests__/request/inspect.test.js

            
'use strict'

const { describe, it } = require('node:test')
const request = require('../../test-helpers/context').request
const assert = require('assert')
const util = require('util')

describe('req.inspect()', () => {
  describe('with no request.req present', () => {
    it('should return null', () => {
      const req = request()
      req.method = 'GET'
      delete req.req
      assert(undefined === req.inspect())
      assert(util.inspect(req) === 'undefined')
    })
  })

  it('should return a json representation', () => {
    const req = request()
    req.method = 'GET'
    req.url = 'example.com'
    req.header.host = 'example.com'

    const expected = {
      method: 'GET',
      url: 'example.com',
      header: {
        host: 'example.com'
      }
    }

    assert.deepStrictEqual(req.inspect(), expected)
    assert.deepStrictEqual(util.inspect(req), util.inspect(expected))
  })
})