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Testing v-for Directive Transformation in uni-app Baidu Mini Program

This test suite validates the transformation of v-for directives in the Baidu Mini Program context within uni-app. It ensures proper handling of list rendering with and without key attributes, verifying the correct compilation of Vue-style v-for syntax to Baidu’s s-for template syntax.

Test Coverage Overview

The test suite provides comprehensive coverage of v-for directive transformations:

Tests v-for implementation with explicit key bindings
Verifies v-for functionality without key attributes
Ensures correct template transformation from Vue to Baidu Mini Program syntax
Validates proper function generation for list processing

Implementation Analysis

The testing approach employs Jest’s describe/test structure to organize v-for directive tests. It utilizes a custom assert utility to verify both the template transformation and runtime function generation. The implementation specifically checks the conversion of Vue’s v-for syntax to Baidu’s s-for directive, including proper tracking and key handling.

Technical Details

Testing tools and configuration:

Jest as the primary testing framework
Custom assert utility for transformation validation
Template string comparison for syntax verification
Function string analysis for runtime behavior testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for different v-for scenarios
Clear separation of concerns between template and runtime testing
Consistent test structure and naming conventions
Comprehensive validation of both syntax and functionality

dcloudio/uni-app

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

            
import { assert } from './testUtils'

describe(`mp-baidu: transform v-for`, () => {
  test(`with key`, () => {
    assert(
      `<view v-for="item in items" :key="item.id"/>`,
      `<view s-for="item in a trackBy item.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 s-for="item in a"/>`,
      `(_ctx, _cache) => {
  return { a: _f(_ctx.items, (item, k0, i0) => { return {}; }) }
}`
    )
  })
})