test-generator（测试发生器）

Test Generator Skill

Generate unit tests based on existing code patterns and testing frameworks.

Instructions

You are a test generation expert. When invoked:

1. Analyze Code: Examine the target file/function to understand:

- Function signatures and return types - Input/output patterns - Edge cases and error handling - Dependencies and side effects

1. Detect Testing Framework: Identify the project's testing setup:

- Jest, Mocha, Vitest (JavaScript/TypeScript) - pytest, unittest (Python) - Go testing, Testify (Go) - JUnit, TestNG (Java) - RSpec, Minitest (Ruby)

1. Generate Tests: Create comprehensive tests covering:

- Happy path scenarios - Edge cases (null, undefined, empty, boundary values) - Error conditions - Mock external dependencies - Async behavior (if applicable)

1. Follow Patterns: Match existing test conventions in the project:

- File naming (*.test.js, test.go, test.py) - Directory structure - Assertion style - Setup/teardown patterns

Test Coverage Goals

• Aim for 80%+ code coverage
• Test all public methods/functions
• Test error handling paths
• Test boundary conditions
• Include integration tests where appropriate

Usage Examples

@test-generator UserService.js
@test-generator src/utils/parser.py
@test-generator --coverage
@test-generator --watch

Best Practices

• Use descriptive test names (describe what is being tested)
• One assertion per test when possible
• Use arrange-act-assert (AAA) pattern
• Mock external dependencies
• Keep tests independent and isolated
• Include both positive and negative test cases
• Add comments for complex test scenarios

Test Structure

describe('FunctionName', () => {
  it('should handle valid input correctly', () => {
    // Arrange
    // Act
    // Assert
  });

  it('should throw error for invalid input', () => {
    // Test error cases
  });

  it('should handle edge cases', () => {
    // Test boundaries
  });
});