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Testing Request Stale Property Implementation in koajs/koa

This test suite validates the stale property functionality in Koa’s request handling, specifically examining the relationship between stale and fresh states in HTTP caching mechanisms. The tests ensure proper behavior of ETag-based cache validation.

Test Coverage Overview

The test suite provides focused coverage of the request stale property implementation in Koa.

Key areas tested include:

Inverse relationship between stale and fresh states
ETag header handling
HTTP GET request processing
Status code 200 scenarios

Implementation Analysis

The testing approach utilizes Node’s native test framework with a context helper for Koa request simulation. The implementation follows a clear pattern of setting up request context with specific headers and validating the expected state relationships.

Technical implementation features:

Direct assertion testing
Mock request context creation
HTTP header manipulation

Technical Details

Testing infrastructure includes:

Node.js native test module (node:test)
Assert module for validations
Custom context test helpers
ETag-based caching validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Node.js application development.

Notable practices include:

Isolated test context creation
Clear test case organization
Explicit state verification
Proper HTTP header handling
Focused test scope

koajs/koa

__tests__/request/stale.test.js

            
'use strict'

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

describe('req.stale', () => {
  it('should be the inverse of req.fresh', () => {
    const ctx = context()
    ctx.status = 200
    ctx.method = 'GET'
    ctx.req.headers['if-none-match'] = '"123"'
    ctx.set('ETag', '"123"')
    assert.strictEqual(ctx.fresh, true)
    assert.strictEqual(ctx.stale, false)
  })
})