---
title: "Testing Agent Code"
source: https://docs.autohand.ai/agent-sdk/tutorials/600-testing-agent
---

# Build a Testing Agent

Learn how to create a coding assistant that automatically generates unit tests and integration tests with the Autohand Code Agent SDK. Available in TypeScript, Python, Java, Go, Swift, and Rust.

In this tutorial, you'll build a testing coding assistant that reads source code, understands its functionality, and automatically generates comprehensive unit tests. This demonstrates how to use the Agent SDK for automated testing.

**Prerequisites:**

-   Completed [Code Reviewer Agent](100-code-reviewer-agent.html)
-   Node.js 16+ (for TypeScript), Python 3.10+ (for Python), Java 11+ (for Java), Go 1.16+ (for Go), Swift 5.5+ (for Swift), or Rust 1.60+ (for Rust)
-   SDK installed for your chosen language
-   API key from your LLM provider (set as `AUTOHAND_API_KEY`)

## What You'll Build

A testing coding assistant that:

-   Reads source code files
-   Understands function behavior and edge cases
-   Generates unit tests with assertions
-   Covers edge cases and error conditions
-   Runs tests and reports results
-   Supports multiple testing frameworks

## Step 1: Create Sample Code

Create a sample code file to test in your chosen language:

## Step 2: Create Testing Agent

Create an agent with test generation capabilities in your chosen language:

## Step 3: Generate Tests

Run the test generator agent on your sample code in your chosen language:

## Key Concepts

1

**Code Analysis**

The agent reads and analyzes source code to understand function behavior.

2

**Edge Case Coverage**

Tests cover normal cases, edge cases, and error conditions.

3

**Test Generation**

Using WRITE\_FILE to create comprehensive test files.

4

**Test Execution**

Using BASH to run tests and report results.

## Complete Example

Here's the complete example with cleanup:

## Real-World Applications

This pattern can be applied to:

-   **Test automation:** Auto-generate tests for new code
-   **Regression testing:** Ensure code changes don't break existing functionality
-   **Code review:** Generate tests alongside code reviews
-   **CI/CD integration:** Automatically test code before deployment
-   **Legacy code testing:** Add tests to untested legacy codebases

## Next Steps

### 📁 View the Example

See the complete example in the SDK repositories.

[TypeScript Examples →](https://github.com/autohandai/agent-sdk-typescript/tree/main/examples)

### 📚 Explore More

Check out all examples in the SDK repositories.

[Agent SDK Overview →](../overview.html)