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Testing Template Interpolation Transformation in dcloudio/uni-app

A comprehensive test suite for validating string interpolation transformations in the uni-app UTS framework. This test suite focuses on verifying the correct compilation of template expressions and text content within text elements, ensuring proper transformation of both static and dynamic content.

Test Coverage Overview

The test suite provides coverage for template interpolation transformations in uni-app UTS.

Key areas tested include:

Static text content rendering
Dynamic expression interpolation
Mixed static/dynamic content handling
Template syntax transformation to JavaScript

Implementation Analysis

The testing approach utilizes Jest’s describe/test structure with custom assertion utilities. The implementation focuses on verifying the compiler’s transformation of template syntax into executable JavaScript code, specifically testing the creation of element nodes and text interpolation.

Technical patterns include:

Custom assert function for comparing input/output
Template literal validation
Node creation verification

Technical Details

Testing infrastructure includes:

Jest test framework
Custom testUtils assertion library
Template transformation compiler
Node creation verification tools

Configuration leverages TypeScript for type safety and Jest’s built-in assertion capabilities.

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for specific transformations
Clear input/output validation
Comprehensive coverage of edge cases
Structured test organization
Descriptive test naming conventions

dcloudio/uni-app

packages/uni-app-uts/__tests__/android/transforms/transformInterpolation.spec.ts

            
import { assert } from '../testUtils'

describe('compiler: transform interpolation', () => {
  test('transform interpolation', () => {
    assert(`<text>foo</text>`, `createElementVNode("text", null, "foo")`)
    assert(
      `<text>{{ foo }} bar {{ baz }}</text>`,
      `createElementVNode("text", null, toDisplayString(_ctx.foo) + " bar " + toDisplayString(_ctx.baz), 1 /* TEXT */)`
    )
  })
})