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Validating v-if Directive Transformation in uni-app XHS Platform

A comprehensive test suite for validating v-if conditional rendering transformations in the Xiaohongshu (XHS) mini-program platform within uni-app. This test suite ensures proper conversion of Vue’s v-if directives to XHS-specific conditional rendering syntax.

Test Coverage Overview

The test suite focuses on verifying the transformation of Vue’s conditional rendering directives (v-if, v-else-if, v-else) to XHS platform-specific syntax.

Key areas covered include:

Basic conditional rendering transformation
Proper conversion of v-if to xhs:if
Handling of v-else-if and v-else directives
Context variable mapping and expression evaluation

Implementation Analysis

The testing approach utilizes Jest’s describe/test pattern combined with a custom assert utility for comparing input templates with expected XHS output.

The implementation validates three key aspects:

Template transformation accuracy
Runtime rendering function generation
Context variable mapping preservation

Technical patterns include template AST transformation and runtime function compilation verification.

Technical Details

Testing infrastructure includes:

Jest as the primary testing framework
Custom assert utility for template comparison
Template transformation validation
Runtime function generation verification
AST-based template analysis

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for specific functionality
Clear input/output validation
Comprehensive transformation verification
Platform-specific syntax validation
Runtime behavior verification

dcloudio/uni-app

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

            
import { assert } from './testUtils'

describe(`mp-xhs: transform v-if`, () => {
  test(`basic`, () => {
    assert(
      `<view v-if="ok"/><view v-else-if="ok1"/><view v-else/>`,
      `<view xhs:if="{{a}}"/><view xhs:elif="{{b}}"/><view xhs:else/>`,
      `(_ctx, _cache) => {
  return _e({ a: _ctx.ok }, _ctx.ok ? {} : _ctx.ok1 ? {} : {}, { b: _ctx.ok1 })
}`
    )
  })
})