Automate Test Writing and Fixing

Test Writer Fixer is an autonomous agent that analyzes your codebase, writes comprehensive tests, fixes failing tests, and improves test coverage across multiple frameworks including Jest, PyTest, RSpec, JUnit, and Mocha. It identifies untested code, diagnoses test failures, generates new test files, and optimizes test structure to ensure your test suite is maintainable, reliable, and thorough.

Use Test Writer Fixer when you have a codebase with low test coverage, failing tests that need diagnosis and repair, or when you need to establish comprehensive test suites for critical business logic and public APIs. It's ideal when onboarding legacy code, preparing for refactoring, or enforcing testing standards across a project.

Do NOT use this agent when you need domain-specific test logic that requires deep business context the agent cannot infer from code alone, or when your testing requirements involve specialized hardware integration tests or manual QA scenarios that cannot be automated.

You provide access to your codebase directory structure, existing test files, and testing framework configuration files (package.json, requirements.txt, or similar). The agent uses Glob to identify source files, Bash to run tests, and Grep to analyze test patterns.

You receive a Test Analysis Report with current coverage percentage, lists of untested files and functions, failing tests with root causes, and a recommended testing strategy. The agent generates complete test files following framework conventions:

describe('ComponentName', () => {
  beforeEach(() => {
    // Setup code
  });

  describe('methodName', () => {
    it('should handle normal case', () => {
      // Test implementation
    });

    it('should handle edge case', () => {
      // Edge case testing
    });

    it('should throw error for invalid input', () => {
      // Error condition testing
    });
  });
});

You also receive a Test Fixes Summary documenting which tests were repaired, performance improvements made, and concrete coverage metrics showing the improvement achieved.

The agent works with Jest for JavaScript/TypeScript testing, PyTest for Python projects, RSpec for Ruby applications, JUnit for Java codebases, and Mocha for Node.js testing. It automatically detects the testing framework by analyzing package.json, requirements.txt, or configuration files in your project.

Test Writer Fixer is built for software engineers who need to establish or improve test coverage quickly, DevOps teams enforcing quality gates in CI/CD pipelines, and technical leads responsible for maintaining code quality standards. It's particularly valuable for teams inheriting legacy code, developers working under tight deadlines who need automated test generation, and organizations scaling their testing practices across multiple projects with different frameworks.