yoto-smart-stream-testing

name	yoto-smart-stream-testing
description	Comprehensive testing guide for Yoto Smart Stream - covering authentication testing, functional testing, Playwright UI automation, and test-and-fix development loops. Use when writing tests, debugging test failures, or implementing test coverage.

Yoto Smart Stream Testing

Comprehensive testing guide covering authentication testing, functional testing patterns, Playwright UI automation, and iterative test-and-fix development loops.

Overview

Testing strategy for Yoto Smart Stream focuses on:

1. Authentication Testing - Verifying login flows, session management, and OAuth integration
2. Functional Testing - API endpoints, business logic, and integration testing
3. Playwright Testing - UI automation for login workflows and end-to-end scenarios
4. Test-and-Fix Loops - Iterative development with automated validation

Test Philosophy

• Test First: Write tests before implementing features (TDD)
• Fast Feedback: Tests should run quickly and provide clear error messages
• Real Scenarios: Tests should mirror actual user workflows
• Automated: All tests should run in CI/CD without manual intervention
• Maintainable: Tests should be easy to understand and update

v0.3.0 Release Validation ✅

Playwright UI Testing Results:

• Dashboard Page: PWA registered, 2 players loaded, MQTT enabled, zero console errors
• Admin Page: Dark Mode widget visible and functional, all controls responsive, zero errors
• Login Page: Authentication form renders correctly, Dark Mode widget operational, zero errors
• Dark Mode Widget: "🌓 Activate dark mode" control verified on all pages
• Browser Console: No errors, warnings, or issues on any tested page
• Deployment: v0.3.0 stable on Railway, health checks passing, service running

Quick Start

Prerequisites

# Install development dependencies
pip install -e ".[dev]"

# Verify pytest is installed
pytest --version

# Verify Playwright is installed (for UI tests)
playwright --version

Run All Tests

# Run all tests with coverage
pytest --cov=yoto_smart_stream --cov-report=html

# Run specific test categories
pytest tests/test_auth.py          # Authentication tests
pytest tests/test_api.py           # API endpoint tests
pytest tests/test_login_flows.py   # Playwright UI tests

# Run with verbose output
pytest -v

# Run with output capture disabled (see print statements)
pytest -s

Basic Test Structure

import pytest
from fastapi.testclient import TestClient
from yoto_smart_stream.api.app import app

@pytest.fixture
def client():
    """Test client fixture."""
    return TestClient(app)

def test_health_endpoint(client):
    """Test health check endpoint."""
    response = client.get("/api/health")
    assert response.status_code == 200
    assert response.json()["status"] == "healthy"

def test_login_success(client):
    """Test successful login."""
    response = client.post("/api/user/login", json={
        "username": "admin",
        "password": "yoto"
    })
    assert response.status_code == 200
    assert "access_token" in response.json()

Reference Documentation

For detailed testing information, refer to:

• 📋 Testing Guide - Complete testing guide with unit tests, integration tests, and manual testing procedures
• 🔐 Login Workflows - Detailed documentation of authentication flows and Playwright UI testing patterns

Common Testing Patterns

1. Resolving Service URL

Pattern: Determine the correct service URL for testing

import os
import subprocess

def get_service_url():
    """Get service URL from environment or Railway CLI."""
    # Try environment variable first
    url = os.getenv("SERVICE_URL")
    if url:
        return url
    
    # Try Railway CLI
    try:
        result = subprocess.run(
            ["railway", "domain"],
            capture_output=True,
            text=True,
            check=True
        )
        domain = result.stdout.strip()
        return f"https://{domain}"
    except Exception:
        pass
    
    # Fall back to pattern
    env = os.getenv("RAILWAY_ENVIRONMENT", "develop")
    return f"https://yoto-smart-stream-{env}.up.railway.app"

# Use in tests
@pytest.fixture
def service_url():
    return get_service_url()

def test_service_health(service_url):
    response = requests.get(f"{service_url}/api/health")
    assert response.status_code == 200

2. UI Login (Playwright)

Pattern: Automate browser login for UI testing

import pytest
from playwright.sync_api import Page, expect

@pytest.fixture(scope="session")
def service_url():
    """Get service URL for testing."""
    return os.getenv("SERVICE_URL", "https://yoto-smart-stream-develop.up.railway.app")

def test_ui_login(page: Page, service_url: str):
    """Test login via UI."""
    # Navigate to login page
    page.goto(service_url)
    
    # Should redirect to login
    expect(page).to_have_url(f"{service_url}/login")
    
    # Fill login form
    page.fill('input[name="username"]', "admin")
    page.fill('input[name="password"]', "yoto")
    page.click('button[type="submit"]')
    
    # Should redirect to dashboard
    expect(page).to_have_url(f"{service_url}/")
    expect(page.locator("h1")).to_contain_text("Dashboard")

def test_oauth_button_visible(page: Page, service_url: str):
    """Test OAuth connect button appears after login."""
    # Login first
    page.goto(f"{service_url}/login")
    page.fill('input[name="username"]', "admin")
    page.fill('input[name="password"]', "yoto")
    page.click()
    
    
    oauth_button = page.locator()
    expect(oauth_button).to_be_visible()

3. API Login (Programmatic)

Pattern: Get JWT token for API testing

import requests

@pytest.fixture
def auth_token(service_url):
    """Get authentication token for API tests."""
    response = requests.post(
        f"{service_url}/api/user/login",
        json={"username": "admin", "password": "yoto"}
    )
    assert response.status_code == 200
    return response.json()["access_token"]

def test_authenticated_endpoint(service_url, auth_token):
    """Test endpoint requiring authentication."""
    headers = {"Authorization": f"Bearer {auth_token}"}
    response = requests.get(
        f"{service_url}/api/players",
        headers=headers
    )
    assert response.status_code == 200
    assert isinstance(response.json(), list)

4. Hybrid Testing (UI + API)

Pattern: Combine UI and API testing for complex scenarios

def test_complete_user_journey(page: Page, service_url: str):
    """Test complete user journey from login to playing audio."""
    # 1. Login via UI
    page.goto(f"{service_url}/login")
    page.fill('input[name="username"]', "admin")
    page.fill('input[name="password"]', "yoto")
    page.click('button[type="submit"]')
    
    # 2. Extract auth cookie/token from browser
    cookies = page.context.cookies()
    auth_cookie = next(c for c in cookies if c["name"] == "session")
    
    # 3. Use API to create content
    headers = {"Cookie": f"session={auth_cookie['value']}"}
    response = requests.post(
        f"{service_url}/api/cards",
        headers=headers,
        json={"title": "Test Card", "content": {...}}
    )
    assert response.status_code == 201
    card_id = response.json()["id"]
    
    # 4. Verify card appears in UI
    page.goto(f"{service_url}/library")
    expect(page.locator(f'[data-card-id="{card_id}"]')).to_be_visible()

5. Fixture-Based Testing

Pattern: Reusable test fixtures for common setups

import pytest
from playwright.sync_api import Page

@pytest.fixture
def logged_in_page(page: Page, service_url: str):
    """Fixture providing a logged-in browser page."""
    page.goto(f"{service_url}/login")
    page.fill('input[name="username"]', "admin")
    page.fill('input[name="password"]', "yoto")
    page.click('button[type="submit"]')
    expect(page).to_have_url(f"{service_url}/")
    return page

@pytest.fixture
def api_client(service_url: str):
    """Fixture providing authenticated API client."""
    response = requests.post(
        f"{service_url}/api/user/login",
        json={"username": "admin", "password": "yoto"}
    )
    token = response.json()["access_token"]
    
    class AuthClient:
        def __init__(self, base_url, token):
            self.base_url = base_url
            self.headers = {"Authorization": f"Bearer {token}"}
        
        def get(self, path):
            return requests.get(, headers=.headers)
        
         ():
             requests.post(, headers=.headers, json=json)
    
     AuthClient(service_url, token)


 ():
    
    expect(logged_in_page.locator()).to_contain_text()

 ():
    
    response = api_client.get()
     response.status_code == 

Test Organization

Directory Structure

tests/
├── __init__.py
├── conftest.py              # Shared fixtures
├── test_auth.py             # Authentication tests
├── test_api_endpoints.py    # API endpoint tests
├── test_login_flows.py      # Playwright UI tests
├── test_audio.py            # Audio management tests
├── test_cards.py            # MYO card tests
├── test_users.py            # User management tests
├── test_oauth.py            # OAuth flow tests
├── integration/             # Integration tests
│   ├── test_complete_flows.py
│   └── test_player_control.py
└── fixtures/                # Test data
    ├── sample_audio.mp3
    └── sample_icon.png

Test Categories

Unit Tests (test_*.py in root):

• Fast execution
• Isolated components
• Mocked dependencies
• High coverage target (>80%)

Integration Tests (integration/):

• Test component interactions
• Use real dependencies where possible
• Slower but more realistic
• Coverage target (>60%)

UI Tests (test_login_flows.py, test_ui_*.py):

• Playwright browser automation
• Real user workflows
• Slower execution
• Focus on critical paths

Test Pyramid

     /\
    /UI\         ← Few (critical workflows)
   /────\
  /INTEG\        ← Some (component interactions)
 /──────\
/  UNIT  \       ← Many (isolated components)
──────────

Best Practices

1. Test Naming

# Good: Descriptive test names
def test_login_with_valid_credentials_returns_token():
    ...

def test_login_with_invalid_password_returns_401():
    ...

# Bad: Vague test names
def test_login():
    ...

def test_case_1():
    ...

2. Arrange-Act-Assert

def test_create_user():
    # Arrange: Setup test data
    user_data = {
        "username": "testuser",
        "password": "testpass",
        "role": "user"
    }
    
    # Act: Execute the action
    response = client.post("/api/admin/users", json=user_data)
    
    # Assert: Verify the results
    assert response.status_code == 201
    assert response.json()["username"] == "testuser"
    assert response.json()["role"] == "user"

3. Test Isolation

# Good: Each test is independent
@pytest.fixture
def clean_database():
    db.clear()
    yield
    db.clear()

def test_create_user(clean_database):
    # Test creates user in clean database
    ...

def test_list_users(clean_database):
    # Test lists users in clean database
    ...

# Bad: Tests depend on each other
def test_create_user():
    global user_id
    user_id = create_user()

def test_delete_user():
    delete_user(user_id)  # Depends on previous test

4. Clear Error Messages

# Good: Descriptive assertions
def test_player_status():
    response = client.get("/api/players/123")
    assert response.status_code == 200, \
        f"Expected 200 but got {response.status_code}. Response: {response.text}"
    
    data = response.json()
    assert "online" in data, \
        f"'online' field missing from response. Got: {list(data.keys())}"

# Bad: Bare assertions
def test_player_status():
    response = client.get("/api/players/123")
    assert response.status_code == 200
    assert "online" in response.json()

5. Fixtures Over Setup/Teardown

# Good: Use fixtures
@pytest.fixture
def test_user(client):
    response = client.post("/api/admin/users", json={
        "username": "testuser",
        "password": "testpass"
    })
    user_id = response.json()["id"]
    yield user_id
    client.delete(f"/api/admin/users/{user_id}")

def test_with_user(client, test_user):
    # User automatically created and cleaned up
    ...

# Bad: Manual setup/teardown
def test_with_user(client):
    # Setup
    response = client.post("/api/admin/users", ...)
    user_id = response.json()["id"]
    
    try:
        # Test
        ...
    finally:
        # Teardown
        client.delete(f"/api/admin/users/{user_id}")

Running Tests

Local Development

# Run all tests
pytest

# Run specific test file
pytest tests/test_auth.py

# Run specific test
pytest tests/test_auth.py::test_login_success

# Run tests matching pattern
pytest -k "login"

# Run with coverage
pytest --cov=yoto_smart_stream --cov-report=html

# Run and stop on first failure
pytest -x

# Run with verbose output
pytest -v

# Run with print statements visible
pytest -s

# Run in parallel (requires pytest-xdist)
pytest -n auto

Playwright Tests

# Run Playwright tests
pytest tests/test_login_flows.py

# Run in headed mode (see browser)
pytest tests/test_login_flows.py --headed

# Run specific browser
pytest tests/test_login_flows.py --browser chromium
pytest tests/test_login_flows.py --browser firefox
pytest tests/test_login_flows.py --browser webkit

# Debug mode (opens Playwright Inspector)
PWDEBUG=1 pytest tests/test_login_flows.py

# Generate trace for debugging
pytest tests/test_login_flows.py --tracing on

CI/CD Testing

# Run in CI mode (non-interactive)
pytest --tb=short --maxfail=3

# Generate JUnit XML for CI reporting
pytest --junitxml=test-results.xml

# Generate coverage reports for CI
pytest --cov=yoto_smart_stream --cov-report=xml --cov-report=term

# Run with environment-specific config
SERVICE_URL=https://yoto-smart-stream-pr-61.up.railway.app pytest

Troubleshooting

Tests Failing Locally

Symptom: Tests pass in CI but fail locally (or vice versa)

Common Causes:

1. Environment Variables:

   # Check required environment variables
   echo $SERVICE_URL
   echo $YOTO_CLIENT_ID
   
   # Set for testing
   export SERVICE_URL=https://yoto-smart-stream-develop.up.railway.app
   

2. Database State:

   # Clear test database
   rm -f test_database.db
   
   # Or use fixture to ensure clean state
   @pytest.fixture(autouse=True)
   def clean_db():
       db.clear()
       yield
       db.clear()
   

3. Network Issues:

   # Test connectivity
   curl https://yoto-smart-stream-develop.up.railway.app/api/health
   
   # Check if service is running
   railway status
   

Playwright Tests Timing Out

Symptom: Playwright tests hang or timeout

Solutions:

1. Increase Timeout:

   @pytest.fixture(scope="session")
   def browser_context_args(browser_context_args):
       return {
           **browser_context_args,
           "timeout": 30000  # 30 seconds
       }
   

2. Wait for Elements:

   # Bad: No wait
   page.click("button")
   
   # Good: Wait for element
   page.wait_for_selector("button", state="visible")
   page.click("button")
   

3. Debug with Traces:

   # Generate trace
   pytest tests/test_login_flows.py --tracing on
   
   # View trace
   playwright show-trace test-results/trace.zip
   

OAuth Tests Failing

Symptom: Tests requiring OAuth fail with "Not authenticated"

Solutions:

1. Mock OAuth in Tests:

   @pytest.fixture
   def mock_oauth(monkeypatch):
       """Mock OAuth for testing."""
       def mock_get_players():
           return [{"id": "player-123", "name": "Test Player"}]
       
       monkeypatch.setattr("yoto_smart_stream.api.routes.get_players", mock_get_players)
   
   def test_with_oauth(client, mock_oauth):
       # OAuth is mocked
       response = client.get("/api/players")
       assert response.status_code == 200
   

2. Skip OAuth Tests:

   @pytest.mark.skipif(
       not os.getenv("OAUTH_CONFIGURED"),
       reason="OAuth not configured"
   )
   def test_real_oauth():
       # Only runs when OAuth is configured
       ...
   

Slow Test Suite

Symptom: Tests take too long to run

Solutions:

1. Run Tests in Parallel:

   pip install pytest-xdist
   pytest -n auto
   

2. Use Markers to Run Subsets:

   @pytest.mark.fast
   def test_fast():
       ...
   
   @pytest.mark.slow
   def test_slow():
       ...
   
   # Run only fast tests
   pytest -m fast
   

3. Mock External Services:

   # Instead of real Yoto API calls
   @pytest.fixture
   def mock_yoto_client(monkeypatch):
       monkeypatch.setattr("yoto_api.YotoClient", MockYotoClient)
   

Coverage Not Accurate

Symptom: Coverage report shows missing lines that are actually tested

Solutions:

1. Include Source in Coverage:

   # setup.cfg or pyproject.toml
   [tool.pytest.ini_options]
   testpaths = ["tests"]
   
   [tool.coverage.run]
   source = ["yoto_smart_stream"]
   omit = ["*/tests/*", "*/venv/*"]
   

2. Run Tests with Coverage:

   pytest --cov=yoto_smart_stream --cov-report=html
   open htmlcov/index.html
   

Test-and-Fix Development Loop

Iterative Development Pattern

1. Write Failing Test:

   def test_new_feature():
       response = client.post("/api/new-endpoint", json={...})
       assert response.status_code == 200
   

2. Run Test (Verify Failure):

   pytest tests/test_new_feature.py -v
   # Should fail with clear error
   

3. Implement Minimum Code:

   @app.post("/api/new-endpoint")
   def new_endpoint(data: dict):
       return {"status": "ok"}
   

4. Run Test Again:

   pytest tests/test_new_feature.py -v
   # Should pass
   

5. Refactor:

   • Improve implementation
   • Add error handling
   • Optimize performance

6. Run Full Test Suite:

   pytest --cov=yoto_smart_stream
   # Verify no regressions
   

Example: Adding New Endpoint

# Step 1: Write test
def test_get_player_volume(client, auth_token):
    headers = {"Authorization": f"Bearer {auth_token}"}
    response = client.get("/api/players/123/volume", headers=headers)
    assert response.status_code == 200
    assert "volume" in response.json()
    assert 0 <= response.json()["volume"] <= 100

# Step 2: Run test (fails)
# $ pytest tests/test_players.py::test_get_player_volume
# E   404 Not Found

# Step 3: Implement endpoint
@app.get("/api/players/{player_id}/volume")
async def get_player_volume(
    player_id: str,
    current_user: User = Depends(get_current_user)
):
    player = await get_player(player_id)
    return {"volume": player.config.volume}

# Step 4: Run test (passes)
# $ pytest tests/test_players.py::test_get_player_volume
# ✓ PASSED

# Step 5: Add more test cases
def test_get_player_volume_invalid_id(client, auth_token):
    headers = {"Authorization": f"Bearer {auth_token}"}
    response = client.get("/api/players/invalid/volume", headers=headers)
    assert response.status_code == 

---

Additional Resources

• Project Docs: See /docs folder for additional guides
• Service Operations: See yoto-smart-stream-service skill
• API Development: See yoto-smart-stream skill
• Example Tests: See /tests folder for test examples
• Playwright Docs: https://playwright.dev/python/docs/intro
• pytest Docs: https://docs.pytest.org/