atr-behavior

# ATR Behavior Testing Skill

This skill enables running browser-based behavior tests using ATR's AI-driven automation. Write tests in natural language in `.test.txt` files and let the AI execute them.

## Overview

Unlike traditional browser testing that requires precise selectors and step-by-step code, ATR uses an AI agent to:
1. Read natural language test specifications
2. Interpret what actions to perform
3. Execute using browser automation
4. Analyze failures and provide recommendations

## Basic Usage

### Run Single Test
```bash
atr run --behavior tests/login.test.txt
```

### Run Directory of Tests
```bash
atr run --behavior tests/e2e/
```

All `.test.txt` files in the directory are executed.

### With Base URL
```bash
atr run --behavior tests/e2e/ --browser-url http://localhost:3000
```

The base URL is used for relative navigation paths.

## Command Options

| Flag | Description | Default |
|------|-------------|---------|
| `--behavior <path>` | Test file or directory | (required) |
| `--browser-url <url>` | Base URL for tests | from config |
| `--headless` | Run browser headless | true |
| `--viewport <WxH>` | Viewport size | 1920x1080 |
| `--cdp-endpoint <url>` | Connect to existing browser | - |

## Test File Format

Test files use `.test.txt` extension with natural language:

```
Test: <test name>

Prerequisites:
- <prerequisite 1>
- <prerequisite 2>

Steps:
1. <step 1>
2. <step 2>
3. <step 3>

Expected Results:
- <expected result 1>
- <expected result 2>
```

### Example: Login Test

```
Test: User can log in with valid credentials

Prerequisites:
- Application running at http://localhost:3000
- Test user exists: test@example.com / password123

Steps:
1. Navigate to /login
2. Enter "test@example.com" in the email field
3. Enter "password123" in the password field
4. Click the "Sign In" button
5. Wait for the dashboard to load

Expected Results:
- URL contains /dashboard
- Welcome message is visible
- No console errors
```

## Running Tests

### Non-H