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Testing Vue Class Component Integration in vue-cli TypeScript Plugin

This test suite validates the Vue Class Component functionality within the Vue CLI TypeScript plugin. It focuses on verifying proper class-based component syntax and build integration for TypeScript-enabled Vue applications.

Test Coverage Overview

The test suite provides comprehensive coverage of Vue Class Component integration scenarios.

Tests both serve and build configurations
Validates class component syntax in App.vue
Ensures proper TypeScript compilation with class decorators
Verifies Vue CLI plugin configuration options

Implementation Analysis

The testing approach uses Jest’s asynchronous testing capabilities combined with custom assertion helpers. It implements a modular pattern with shared test utilities for validating both development and production builds.

Uses custom assertServe and assertBuild helpers
Implements timeout configuration for build processes
Validates TypeScript class syntax transformation

Technical Details

Jest test framework with 30-second timeout
Custom assertion helpers for serve and build commands
Plugin configuration with classComponent flag
File content validation using regex matching
Asynchronous file reading and validation

Best Practices Demonstrated

The test suite exemplifies robust testing practices for Vue CLI plugin development. It maintains clear separation of concerns between test setup, execution, and validation phases.

Modular test helper functions
Explicit plugin configuration
Asynchronous file system operations
Clear test case isolation
Comprehensive build verification

vuejs/vue-cli

packages/@vue/cli-plugin-typescript/__tests__/tsPluginClassComponent.spec.js

            
jest.setTimeout(30000)

const { assertServe, assertBuild } = require('./tsPlugin.helper')

const options = {
  plugins: {
    '@vue/cli-plugin-typescript': {
      classComponent: true
    }
  }
}

assertServe('ts-class-serve', options)
assertBuild('ts-class-build', options, async (project) => {
  const app = await project.read('src/App.vue')
  expect(app).toMatch(`export default class App extends Vue {`)
})