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
2. •

   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)
3. •

   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)
4. •

   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
  });
});