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Testing v-for Directive Transformation in dcloudio/uni-app Xiaohongshu Platform

This test suite validates v-for directive transformation in the uni-app framework for the Red Book (Xiaohongshu) mini-program platform. It ensures proper conversion of Vue’s v-for syntax to Xiaohongshu’s native xhs:for template syntax.

Test Coverage Overview

The test suite provides comprehensive coverage for v-for directive transformations, focusing on two key scenarios:

v-for with explicit key binding using item.id
v-for without key attribute specification

These tests verify the correct generation of platform-specific template syntax and corresponding JavaScript runtime code.

Implementation Analysis

The testing approach utilizes Jest’s describe/test pattern with custom assertion utilities. The implementation validates both the template transformation and runtime code generation aspects.

Each test case compares the input Vue template against expected Xiaohongshu template output and runtime function implementation using a custom assert helper.

Technical Details

Testing tools and configuration:

Jest as the primary testing framework
Custom assert utility for template comparison
TypeScript for type-safe test implementation
Template transformation validation
Runtime code generation verification

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Isolated test cases for distinct functionality
Clear input/output expectations
Consistent test structure and naming
Comprehensive validation of both template and runtime aspects
Type-safe implementation using TypeScript

dcloudio/uni-app

packages/uni-mp-xhs/__tests__/vFor.spec.ts

            
import { assert } from './testUtils'

describe(`mp-xhs: transform v-for`, () => {
  test(`with key`, () => {
    assert(
      `<view v-for="item in items" :key="item.id"/>`,
      `<view xhs:for="{{a}}" xhs:for-item="item" xhs:key="a"/>`,
      `(_ctx, _cache) => {
  return { a: _f(_ctx.items, (item, k0, i0) => { return { a: item.id }; }) }
}`
    )
  })
  test(`without key`, () => {
    assert(
      `<view v-for="item in items"/>`,
      `<view xhs:for="{{a}}" xhs:for-item="item"/>`,
      `(_ctx, _cache) => {
  return { a: _f(_ctx.items, (item, k0, i0) => { return {}; }) }
}`
    )
  })
})