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Testing Search Query String Manipulation in Koa.js

This test suite validates the search query string functionality in Koa’s request context, focusing on how the ctx.search property handles URL query parameters. It ensures proper integration between URL manipulation and query string parsing within the Koa framework.

Test Coverage Overview

The test suite provides comprehensive coverage of search query string manipulation:

Search string replacement and URL updates
Query string parsing and parameter extraction
URL modification while preserving original URL
Empty search string handling

Implementation Analysis

The testing approach utilizes Node’s native test framework with isolated context creation for each test case. The implementation follows a behavior-driven development pattern, using describe/it blocks to organize test scenarios. Each test validates specific aspects of the ctx.search property’s behavior through assertion checks.

Technical Details

Testing Framework: Node.js native test module
Assertion Library: Node’s assert module
Test Helpers: Custom context creation utility
Test Structure: Nested describe blocks with individual test cases

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test contexts for each case
Clear test case descriptions
Comprehensive assertion checking
Proper handling of edge cases
Consistent test structure and organization

koajs/koa

__tests__/request/search.test.js

            
'use strict'

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

describe('ctx.search=', () => {
  it('should replace the search', () => {
    const ctx = context({ url: '/store/shoes' })
    ctx.search = '?page=2&color=blue'
    assert.strictEqual(ctx.url, '/store/shoes?page=2&color=blue')
    assert.strictEqual(ctx.search, '?page=2&color=blue')
  })

  it('should update ctx.querystring and ctx.query', () => {
    const ctx = context({ url: '/store/shoes' })
    ctx.search = '?page=2&color=blue'
    assert.strictEqual(ctx.url, '/store/shoes?page=2&color=blue')
    assert.strictEqual(ctx.querystring, 'page=2&color=blue')
    assert.strictEqual(ctx.query.page, '2')
    assert.strictEqual(ctx.query.color, 'blue')
  })

  it('should change .url but not .originalUrl', () => {
    const ctx = context({ url: '/store/shoes' })
    ctx.search = '?page=2&color=blue'
    assert.strictEqual(ctx.url, '/store/shoes?page=2&color=blue')
    assert.strictEqual(ctx.originalUrl, '/store/shoes')
    assert.strictEqual(ctx.request.originalUrl, '/store/shoes')
  })

  describe('when missing', () => {
    it('should return ""', () => {
      const ctx = context({ url: '/store/shoes' })
      assert.strictEqual(ctx.search, '')
    })
  })
})