Testing

/**
 * Configure application for testing environment
 * Sets up test-specific behaviors and disables automatic run loop
 */
function setupForTesting(): void;

/**
 * Setup application test container with test-specific configuration
 * @param application - Application instance to setup for testing
 */
function setupApplicationTest(application: Application): void;

/**
 * Setup rendering test context for component testing
 * @param hooks - Test hooks object (typically QUnit or Mocha hooks)
 */
function setupRenderingTest(hooks: TestHooks): void;

/**
 * Setup unit test context for isolated object testing
 * @param hooks - Test hooks object
 */
function setupTest(hooks: TestHooks): void;

/**
 * Base test adapter for framework integration
 */
class TestAdapter {
  /**
   * Called when async test operation begins
   */
  asyncStart(): void;
  
  /**
   * Called when async test operation ends
   */
  asyncEnd(): void;
  
  /**
   * Called when test exception occurs
   * @param error - Error that occurred
   */
  exception(error: Error): void;
}

/**
 * QUnit-specific test adapter
 */
class QUnitAdapter extends TestAdapter {
  /**
   * Create QUnit adapter instance
   * @returns New QUnitAdapter
   */
  static create(): QUnitAdapter;
  
  asyncStart(): void;
  asyncEnd(): void;
  exception(error: Error): void;
}

/**
 * Navigate to a URL in the test application
 * @param url - URL to visit
 * @returns Promise that resolves when navigation completes
 */
function visit(url: string): Promise<void>;

/**
 * Click an element in the test application
 * @param selector - CSS selector for element to click
 * @returns Promise that resolves when click completes
 */
function click(selector: string): Promise<void>;

/**
 * Fill in a form input with a value
 * @param selector - CSS selector for input element
 * @param value - Value to fill in
 * @returns Promise that resolves when fill completes
 */
function fillIn(selector: string, value: string): Promise<void>;

/**
 * Trigger an event on an element
 * @param selector - CSS selector for target element
 * @param eventType - Type of event to trigger
 * @param options - Event options
 * @returns Promise that resolves when event completes
 */
function triggerEvent(selector: string, eventType: string, options?: EventOptions): Promise<void>;

/**
 * Find a single element in the test application
 * @param selector - CSS selector for element
 * @returns DOM element or null
 */
function find(selector: string): Element | null;

/**
 * Find all elements matching selector in test application
 * @param selector - CSS selector for elements
 * @returns Array of DOM elements
 */
function findAll(selector: string): Element[];

/**
 * Get current URL in test application
 * @returns Current URL string
 */
function currentURL(): string;

/**
 * Get current route path
 * @returns Current route path
 */
function currentPath(): string;

/**
 * Get current route name
 * @returns Current route name
 */
function currentRouteName(): string;

/**
 * Render a template in the test context
 * @param template - Handlebars template string to render
 * @returns Promise that resolves when rendering completes
 */
function render(template: string): Promise<void>;

/**
 * Clear the rendered content
 * @returns Promise that resolves when clearing completes
 */
function clearRender(): Promise<void>;

/**
 * Set properties on the test context
 * @param properties - Properties to set
 */
function setProperties(properties: object): void;

/**
 * Get property from test context
 * @param key - Property key to get
 * @returns Property value
 */
function getProperty(key: string): any;

/**
 * Register a test waiter that must complete before tests finish
 * @param context - Context object for the waiter
 * @param callback - Function that returns true when complete
 */
function registerWaiter(context: any, callback: () => boolean): void;

/**
 * Unregister a previously registered test waiter
 * @param context - Context object that was registered
 * @param callback - Callback function that was registered
 */
function unregisterWaiter(context: any, callback: () => boolean): void;

/**
 * Wait for all registered waiters to complete
 * @returns Promise that resolves when all waiters complete
 */
function waitForWaiters(): Promise<void>;

/**
 * Check if there are any pending waiters
 * @returns Whether waiters are still pending
 */
function hasPendingWaiters(): boolean;

/**
 * Create a stub service for testing
 * @param properties - Properties to include in stub
 * @returns Stub service object
 */
function createStubService(properties?: object): Service;

/**
 * Register a stub service in the test container
 * @param owner - Test container owner
 * @param serviceName - Name of service to stub
 * @param stub - Stub service instance
 */
function registerStubService(owner: Owner, serviceName: string, stub: Service): void;

/**
 * Mock a service method for testing
 * @param service - Service to mock
 * @param methodName - Method name to mock
 * @param mockImplementation - Mock function
 */
function mockServiceMethod(service: Service, methodName: string, mockImplementation: Function): void;

import { module, test } from 'qunit';
import { setupRenderingTest } from 'ember-qunit';
import { render, click, fillIn, find } from '@ember/test-helpers';
import { hbs } from 'ember-cli-htmlbars';

module('Integration | Component | login-form', function(hooks) {
  setupRenderingTest(hooks);

  test('it renders login form', async function(assert) {
    await render(hbs`<LoginForm />`);
    
    assert.dom('[data-test-login-form]').exists();
    assert.dom('input[type="email"]').exists();
    assert.dom('input[type="password"]').exists();
    assert.dom('button[type="submit"]').hasText('Login');
  });

  test('it handles form submission', async function(assert) {
    let submitted = false;
    this.set('onSubmit', () => { submitted = true; });
    
    await render(hbs`<LoginForm @onSubmit={{this.onSubmit}} />`);
    
    await fillIn('input[type="email"]', 'test@example.com');
    await fillIn('input[type="password"]', 'password123');
    await click('button[type="submit"]');
    
    assert.ok(submitted, 'Form submission handler was called');
  });
});

// Acceptance test example
import { module, test } from 'qunit';
import { visit, currentURL, click, fillIn } from '@ember/test-helpers';
import { setupApplicationTest } from 'ember-qunit';

module('Acceptance | login', function(hooks) {
  setupApplicationTest(hooks);

  test('visiting /login', async function(assert) {
    await visit('/login');
    assert.equal(currentURL(), '/login');
  });

  test('successful login redirects to dashboard', async function(assert) {
    await visit('/login');
    await fillIn('[data-test-email]', 'user@example.com');
    await fillIn('[data-test-password]', 'password');
    await click('[data-test-login-button]');
    
    assert.equal(currentURL(), '/dashboard');
  });
});

// Unit test with service mocking
import { module, test } from 'qunit';
import { setupTest } from 'ember-qunit';

module('Unit | Service | session', function(hooks) {
  setupTest(hooks);

  test('login method calls API correctly', async function(assert) {
    const service = this.owner.lookup('service:session');
    
    // Mock fetch
    const originalFetch = window.fetch;
    window.fetch = () => Promise.resolve({
      ok: true,
      json: () => Promise.resolve({ id: 1, name: 'Test User' })
    });
    
    const result = await service.login('test@example.com', 'password');
    
    assert.ok(result, 'Login should succeed');
    assert.equal(service.currentUser.name, 'Test User');
    assert.ok(service.isAuthenticated, 'Should be authenticated');
    
    // Restore fetch
    window.fetch = originalFetch;
  });
});

/**
 * Test configuration options
 */
interface TestConfig {
  /** Test adapter to use */
  adapter?: TestAdapter;
  
  /** Whether to automatically advance timers */
  autoAdvanceTimers?: boolean;
  
  /** Default timeout for async operations */
  timeout?: number;
}

/**
 * Configure test environment
 * @param config - Test configuration options
 */
function configureTest(config: TestConfig): void;

interface TestHooks {
  /** Setup hook called before each test */
  beforeEach?: (callback: Function) => void;
  
  /** Teardown hook called after each test */
  afterEach?: (callback: Function) => void;
  
  /** Setup hook called before all tests */
  before?: (callback: Function) => void;
  
  /** Teardown hook called after all tests */
  after?: (callback: Function) => void;
}

interface EventOptions {
  /** Event bubbles */
  bubbles?: boolean;
  
  /** Event is cancelable */
  cancelable?: boolean;
  
  /** Additional event properties */
  [key: string]: any;
}

interface TestContext {
  /** Test owner (DI container) */
  owner: Owner;
  
  /** Test element for rendering */
  element: Element;
  
  /** Set property on test context */
  set(key: string, value: any): void;
  
  /** Get property from test context */
  get(key: string): any;
}