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

atr run --behavior tests/login.test.txt

Run Directory of Tests

atr run --behavior tests/e2e/

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

With Base URL

atr run --behavior tests/e2e/ --browser-url http://localhost:3000

The base URL is used for relative navigation paths.

Command Options

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-Headless Mode (for debugging)

atr run --behavior tests/login.test.txt --headless=false

Mobile Viewport

atr run --behavior tests/mobile.test.txt --viewport 375x667

Connect to Existing Browser

1. Launch Chrome with remote debugging:

   google-chrome --remote-debugging-port=9222
   

2. Connect ATR:

   atr run --behavior tests/debug.test.txt --cdp-endpoint ws://localhost:9222
   

How It Works

The AI agent has access to these browser tools:

Navigation: navigate, back, forward, reload, new-page, select-page, close-page, wait-for

Input: click, fill, hover, press-key, drag, upload-file, handle-dialog

Inspection: snapshot, screenshot, evaluate JavaScript, console logs, network requests

Element Resolution

The AI finds elements using multiple strategies:

1. Accessible name: [aria-label="Sign In"]
2. Test ID: [data-testid="submit-btn"]
3. Name attribute: [name="email"]
4. Placeholder: [placeholder="Enter email"]
5. Text content: Element containing "Sign In"
6. CSS selector: #submit

Best Practice: Use aria-label or data-testid for reliable element targeting.

Failure Analysis

When tests fail, ATR captures:

• Screenshot of current state
• Console logs
• Network requests
• DOM snapshot

The AI provides root cause analysis and recommendations.

Integration with atr-browser

For manual browser exploration before writing tests:

1. Start browser server: atr browser start
2. Navigate and explore: atr browser navigate <url>
3. Inspect elements: atr browser snapshot
4. Write test file based on exploration
5. Run test: atr run --behavior test.test.txt
6. Stop browser: atr browser stop

Best Practices

1. Clear descriptions: "Click the 'Add to Cart' button in the product details section"
2. Add waits: "Wait for 'Loading...' to disappear"
3. Use test IDs: Reference data-testid attributes when available
4. One flow per test: Keep tests focused on single user journeys
5. Document prerequisites: Clearly state required application state

Configuration

Configure in ~/.atr/config.yaml:

behavior:
  base_url: "http://localhost:3000"

  browser:
    executable: "auto"
    headless: true
    viewport:
      width: 1920
      height: 1080
    page_timeout: "30s"
    action_timeout: "10s"

Additional Resources

For detailed test file format and examples, see references/test-file-format.md.

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