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Testing HTTP Header Validation Methods in Koa.js

This test suite evaluates the header field checking functionality in Koa’s response object. It specifically tests the has() method which verifies the existence of HTTP headers in a case-insensitive manner. The suite ensures robust header validation across different scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of the response.has() method functionality.

Tests case-insensitive header field checking
Validates empty header value scenarios
Verifies behavior with non-existent headers
Covers both direct response and context-level header checks

Implementation Analysis

The testing approach utilizes Node’s native test framework with a clean, focused structure. The implementation employs context helpers for consistent test setup and uses strict assertion patterns to validate header presence.

Uses node:test module for test organization
Leverages custom context helpers for test isolation
Implements both positive and negative test cases

Technical Details

Testing Framework: Node.js native test module
Assertion Library: Node.js assert module
Test Helpers: Custom context creation utility
Setup: Strict mode enforcement
Environment: Node.js runtime

Best Practices Demonstrated

The test suite exemplifies several testing best practices for HTTP header validation.

Isolated test cases with clear descriptions
Consistent use of test helpers
Explicit assertion messages
Coverage of edge cases
Clean setup and teardown patterns

koajs/koa

__tests__/response/has.test.js

            
'use strict'

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

describe('ctx.response.has(name)', () => {
  it('should check a field value, case insensitive way', () => {
    const ctx = context()
    ctx.set('X-Foo', '')
    assert.ok(ctx.response.has('x-Foo'))
    assert.ok(ctx.has('x-foo'))
  })

  it('should return false for non-existent header', () => {
    const ctx = context()
    assert.strictEqual(ctx.response.has('boo'), false)
    ctx.set('x-foo', 5)
    assert.strictEqual(ctx.has('x-boo'), false)
  })
})