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Testing v-text Directive Transformation in uni-app Compiler

This test suite evaluates the v-text directive transformation functionality in the uni-app compiler for mini-program platforms. It verifies proper text binding and interpolation across different syntax variations and element structures.

Test Coverage Overview

The test suite provides comprehensive coverage of v-text directive transformations, including:

Basic text interpolation scenarios
Direct v-text directive usage
String literal text binding
Self-closing element handling

Each test case validates the compiler’s output structure and proper context handling.

Implementation Analysis

The testing approach utilizes Jest’s describe/test pattern with custom assertion utilities. The implementation focuses on comparing input templates against expected compiler output, specifically verifying the transformation of v-text directives into standardized template syntax for mini-programs.

The tests validate both the generated template structure and the corresponding render function implementation.

Technical Details

Testing Infrastructure:

Jest test framework for execution
Custom assert utility for template comparison
Template transformation validation
Render function output verification
Context (_ctx) and cache (_cache) parameter handling

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for specific functionality
Clear test case organization
Consistent assertion patterns
Comprehensive edge case coverage
Maintainable test structure with reusable utilities

dcloudio/uni-app

packages/uni-mp-compiler/__tests__/vText.spec.ts

            
import { assert } from './testUtils'

describe('compiler: transform v-text', () => {
  test('basic', () => {
    assert(
      `<view>{{text}}</view>`,
      `<view>{{a}}</view>`,
      `(_ctx, _cache) => {
  return { a: _t(_ctx.text) }
}`
    )
    assert(
      `<view v-text="text"></view>`,
      `<view>{{a}}</view>`,
      `(_ctx, _cache) => {
  return { a: _t(_ctx.text) }
}`
    )
    assert(
      `<view v-text="'text'"></view>`,
      `<view>{{a}}</view>`,
      `(_ctx, _cache) => {
  return { a: _t('text') }
}`
    )
  })
  test('self closing', () => {
    assert(
      `<view v-text="text"/>`,
      `<view>{{a}}</view>`,
      `(_ctx, _cache) => {
  return { a: _t(_ctx.text) }
}`
    )
  })
})