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Testing Slot Transformation and Fallback Content in uni-app Compiler

This test suite validates slot transformation functionality in the uni-app compiler, focusing on fallback content handling and named slots. The tests ensure proper compilation of slot elements with various configurations in miniProgram components.

Test Coverage Overview

The test suite provides comprehensive coverage of slot transformation scenarios.

Key areas tested include:

Basic slot implementation without content
Slots with fallback content
Named slots functionality
Named slots with fallback content

The suite verifies both simple and complex slot configurations to ensure reliable component composition.

Implementation Analysis

The testing approach uses Jest’s describe/test pattern with a custom assert utility for comparing input and output code snippets.

Key implementation patterns include:

Consistent test structure using assert() helper
Miniprogram-specific configuration options
Template transformation verification
Runtime code generation testing

Technical Details

Testing infrastructure includes:

Jest test framework
Custom assert utility function
MiniProgram configuration options
Slot fallback content flag enabled
Template transformation validation
Runtime code generation verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for distinct functionality
Consistent test structure and naming
Clear input/output expectations
Configuration separation
Comprehensive edge case coverage
Maintainable test organization

dcloudio/uni-app

packages/uni-mp-compiler/__tests__/slot.fallback.spec.ts

            
import { assert, miniProgram } from './testUtils'

const options = {
  miniProgram: {
    ...miniProgram,
    slot: {
      fallbackContent: true,
    },
  },
}
describe('compiler: transform slot', () => {
  test('basic', () => {
    assert(
      `<button><slot/></button>`,
      `<button><slot/></button>`,
      `(_ctx, _cache) => {
  return {}
}`,
      options
    )
  })
  test('fallback content', () => {
    assert(
      `<button><slot>Submit</slot></button>`,
      `<button><slot>Submit</slot></button>`,
      `(_ctx, _cache) => {
  return {}
}`,
      options
    )
  })
  test('names slots', () => {
    assert(
      `<button><slot name="text"/></button>`,
      `<button><slot name="text"/></button>`,
      `(_ctx, _cache) => {
  return {}
}`,
      options
    )
  })
  test('names slots with fallback content', () => {
    assert(
      `<button><slot name="text">Submit</slot></button>`,
      `<button><slot name="text">Submit</slot></button>`,
      `(_ctx, _cache) => {
  return {}
}`,
      options
    )
  })
})