Outcome Recipes

Advanced testing patterns for complex scenarios including async operations, routing, service mocking, and end-to-end component interaction testing.

These recipes show how to test complex real-world scenarios in Aurelia applications. Use them when basic component testing isn't enough.

1. Testing components with async API calls

Goal: Test components that load data from APIs with proper handling of loading states, successful responses, and error scenarios.

Steps

Create a mock HTTP client with configurable responses:

import { IHttpClient } from '@aurelia/fetch-client';
import { Registration } from '@aurelia/kernel';

export class MockHttpClient implements IHttpClient {
  private mockResponses = new Map<string, any>();
  private mockErrors = new Map<string, Error>();

  baseUrl = '';
  activeRequestCount = 0;
  isRequesting = false;

  configure() {
    return this;
  }

  setMockResponse(url: string, data: any, status: number = 200) {
    this.mockResponses.set(url, { data, status });
  }

  setMockError(url: string, error: Error) {
    this.mockErrors.set(url, error);
  }

  async fetch(input: RequestInfo | Request): Promise<Response> {
    const url = typeof input === 'string' ? input : input.url;

    if (this.mockErrors.has(url)) {
      throw this.mockErrors.get(url);
    }

    const mock = this.mockResponses.get(url);
    if (!mock) {
      throw new Error(`No mock response configured for ${url}`);
    }

    return new Response(JSON.stringify(mock.data), {
      status: mock.status,
      headers: { 'Content-Type': 'application/json' }
    });
  }
}

export const MockHttpClientRegistration = Registration.instance(
  IHttpClient,
  new MockHttpClient()
);

Test component with successful data loading:

import { createFixture } from '@aurelia/testing';
import { MockHttpClient, MockHttpClientRegistration } from './mock-http-client';
import { ProductList } from './product-list';

describe('ProductList', () => {
  it('should load and display products', async () => {
    const mockHttp = new MockHttpClient();
    mockHttp.setMockResponse('/api/products', {
      products: [
        { id: '1', name: 'Product 1', price: 10 },
        { id: '2', name: 'Product 2', price: 20 }
      ]
    });

    const { component, assertText, platform } = await createFixture
      .component(ProductList)
      .html`<div>
        <div if.bind="loading">Loading...</div>
        <div if.bind="error">\${error}</div>
        <div repeat.for="product of products">\${product.name}</div>
      </div>`
      .deps(Registration.instance(IHttpClient, mockHttp))
      .build()
      .started;

    // Initial loading state
    assertText('Loading...');

    // Wait for async attached() to complete
    await tasksSettled();

    // Verify products are displayed
    assertText('Product 1Product 2');
    expect(component.loading).toBe(false);
    expect(component.products.length).toBe(2);

    await fixture.stop(true);
  });
});

Test error handling:

it('should display error message when API fails', async () => {
  const mockHttp = new MockHttpClient();
  mockHttp.setMockError('/api/products', new Error('Network error'));

  const { component, assertText, platform } = await createFixture
    .component(ProductList)
    .html`<div>
      <div if.bind="loading">Loading...</div>
      <div if.bind="error">\${error}</div>
      <div repeat.for="product of products">\${product.name}</div>
    </div>`
    .deps(Registration.instance(IHttpClient, mockHttp))
    .build()
    .started;

  // Wait for async operation
  await tasksSettled();

  // Verify error is displayed
  expect(component.error).toBeTruthy();
  expect(component.products.length).toBe(0);
  expect(component.loading).toBe(false);

  await fixture.stop(true);
});

Test retry functionality:

it('should retry loading when retry button is clicked', async () => {
  const mockHttp = new MockHttpClient();
  let callCount = 0;

  // First call fails, second succeeds
  mockHttp.fetch = async (input: RequestInfo | Request) => {
    callCount++;
    if (callCount === 1) {
      throw new Error('Temporary error');
    }
    return new Response(JSON.stringify({
      products: [{ id: '1', name: 'Product 1', price: 10 }]
    }), {
      status: 200,
      headers: { 'Content-Type': 'application/json' }
    });
  };

  const { component, trigger, assertText, platform } = await createFixture
    .component(ProductList)
    .html`<div>
      <div if.bind="loading">Loading...</div>
      <div if.bind="error">
        \${error}
        <button click.trigger="retry()">Retry</button>
      </div>
      <div repeat.for="product of products">\${product.name}</div>
    </div>`
    .deps(Registration.instance(IHttpClient, mockHttp))
    .build()
    .started;

  // Wait for initial failed load
  await tasksSettled();
  expect(component.error).toBeTruthy();

  // Click retry button
  trigger.click('button');

  // Wait for retry to complete
  await tasksSettled();

  // Verify success
  assertText('Product 1');
  expect(component.error).toBeNull();
  expect(callCount).toBe(2);

  await fixture.stop(true);
});

Checklist

Loading state displays before data arrives
Successful API calls populate component data
Error states are handled and displayed
Retry functionality reloads data
All async operations can be waited using await tasksSettled() for timing

Goal: Test components that use routing for navigation, parameter extraction, and route guards.

Steps

Set up a test with router configuration:

import { createFixture } from '@aurelia/testing';
import { IRouter, RouterConfiguration } from '@aurelia/router';
import { ProductDetail } from './product-detail';
import { ProductList } from './product-list';

describe('Router navigation', () => {
  it('should navigate to product detail with correct parameter', async () => {
     const { component, container, platform } = await createFixture
       .component(class App {
         static routes = [
           { path: '', redirect: 'products' },
           { path: 'products', component: ProductList, title: 'Products' },
           { path: 'products/:id', component: ProductDetail, title: 'Product' }
         ];
       })
       .html`<au-viewport></au-viewport>`
       .deps(RouterConfiguration, ProductList, ProductDetail)
       .build()
       .started;

     const router = container.get(IRouter);

     // Navigate to product detail
     await router.load('products/123');
     await tasksSettled();

     // Verify navigation occurred
     expect(router.currentRoute?.path).toContain('products/123');

     await fixture.stop(true);
   });
});

Test route parameter extraction:

it('should extract and use route parameters', async () => {
  let loadedProductId: string | null = null;

  class TestProductDetail {
    productId: string = '';

    loading(params: any) {
      this.productId = params.id;
      loadedProductId = params.id;
    }
  }

  const { container, platform } = await createFixture
    .component(class App {
      static routes = [
        { path: 'products/:id', component: TestProductDetail }
      ];
    })
    .html`<au-viewport></au-viewport>`
    .deps(RouterConfiguration, TestProductDetail)
    .build()
    .started;

  const router = container.get(IRouter);

  // Navigate with parameter
  await router.load('products/456');
  await tasksSettled();

  // Verify parameter was extracted
  expect(loadedProductId).toBe('456');

  await fixture.stop(true);
});

Test route guards:

it('should prevent navigation when canLoad returns false', async () => {
  let canLoadCalled = false;
  let componentLoaded = false;

  class ProtectedComponent {
    canLoad() {
      canLoadCalled = true;
      return false; // Deny navigation
    }

    loading() {
      componentLoaded = true;
    }
  }

  const { container, platform } = await createFixture
    .component(class App {
      static routes = [
        { path: '', component: class Home {} },
        { path: 'protected', component: ProtectedComponent }
      ];
    })
    .html`<au-viewport></au-viewport>`
    .deps(RouterConfiguration, ProtectedComponent)
    .build()
    .started;

  const router = container.get(IRouter);

  // Attempt to navigate to protected route
  await router.load('protected');
  await tasksSettled();

  // Verify navigation was blocked
  expect(canLoadCalled).toBe(true);
  expect(componentLoaded).toBe(false);
  expect(router.currentRoute?.path).not.toContain('protected');

  await fixture.stop(true);
});

Test route guard redirects:

it('should redirect when canLoad returns a different path', async () => {
  class AuthGuard {
    canLoad() {
      // Simulate unauthenticated user
      return '/login'; // Redirect
    }
  }

  class LoginPage {
    loaded = false;
    loading() {
      this.loaded = true;
    }
  }

  const { container, platform } = await createFixture
    .component(class App {
      static routes = [
        { path: 'dashboard', component: AuthGuard },
        { path: 'login', component: LoginPage }
      ];
    })
    .html`<au-viewport></au-viewport>`
    .deps(RouterConfiguration, AuthGuard, LoginPage)
    .build()
    .started;

  const router = container.get(IRouter);

  // Try to access protected route
  await router.load('dashboard');
  await tasksSettled();

  // Verify redirect to login
  expect(router.currentRoute?.path).toContain('login');

  await fixture.stop(true);
});

Checklist

Router navigation works in tests
Route parameters are extracted correctly
canLoad guards are invoked and respected
Redirects from guards work as expected
Current route state is verifiable

3. Testing with validation

Goal: Test form validation including rules, error display, and submission prevention.

Steps

Set up validation testing environment:

import { createFixture } from '@aurelia/testing';
import { ValidationHtmlConfiguration } from '@aurelia/validation-html';
import { IValidationRules } from '@aurelia/validation';
import { IValidationController } from '@aurelia/validation-html';
import { newInstanceForScope, resolve } from '@aurelia/kernel';

describe('Form validation', () => {
  it('should validate required fields and show errors', async () => {
    class SignupForm {
      user = { email: '', password: '' };
      controller = resolve(newInstanceForScope(IValidationController));

      constructor(private rules = resolve(IValidationRules)) {
        this.rules
          .on(this.user)
          .ensure('email')
            .required().withMessage('Email is required')
            .email().withMessage('Email must be valid')
          .ensure('password')
            .required().withMessage('Password is required')
            .minLength(8).withMessage('Password must be at least 8 characters');
      }

      async submit() {
        const result = await this.controller.validate();
        return result.valid;
      }
    }

    const { component, platform } = await createFixture
      .component(SignupForm)
      .html`<div>
        <div validation-errors.from-view="emailErrors">
          <input value.bind="user.email & validate:manual">
          <span repeat.for="error of emailErrors">\${error.result.message}</span>
        </div>
        <div validation-errors.from-view="passwordErrors">
          <input value.bind="user.password & validate:manual">
          <span repeat.for="error of passwordErrors">\${error.result.message}</span>
        </div>
      </div>`
      .deps(ValidationHtmlConfiguration)
      .build()
      .started;

    // Submit without filling form
    const isValid = await component.submit();
     await tasksSettled();

    // Verify validation failed
    expect(isValid).toBe(false);
    expect(component.controller.results.length).toBe(2); // Two errors

    await fixture.stop(true);
  });
});

Test validation with valid input:

it('should pass validation with valid input', async () => {
  class SignupForm {
    user = { email: '[email protected]', password: 'SecurePass123' };
    controller = resolve(newInstanceForScope(IValidationController));

    constructor(private rules = resolve(IValidationRules)) {
      this.rules
        .on(this.user)
        .ensure('email').required().email()
        .ensure('password').required().minLength(8);
    }

    async submit() {
      const result = await this.controller.validate();
      return result.valid;
    }
  }

  const { component, platform } = await createFixture
    .component(SignupForm)
    .html`<div>
      <input value.bind="user.email & validate:manual">
      <input value.bind="user.password & validate:manual">
    </div>`
    .deps(ValidationHtmlConfiguration)
    .build()
    .started;

  // Submit with valid data
  const isValid = await component.submit();
  await tasksSettled();

  // Verify validation passed
  expect(isValid).toBe(true);
  expect(component.controller.results.length).toBe(0);

  await fixture.stop(true);
});

Test field-level validation on blur:

it('should validate individual fields on blur', async () => {
  class FormComponent {
    user = { email: '' };
    controller = resolve(newInstanceForScope(IValidationController));

    constructor(private rules = resolve(IValidationRules)) {
      this.rules
        .on(this.user)
        .ensure('email').required().email();
    }
  }

  const { component, type, trigger, getBy, platform } = await createFixture
    .component(FormComponent)
    .html`<div validation-errors.from-view="emailErrors">
      <input id="email" value.bind="user.email & validate:blur">
      <span repeat.for="error of emailErrors">\${error.result.message}</span>
    </div>`
    .deps(ValidationHtmlConfiguration)
    .build()
    .started;

  // Type invalid email
  type('#email', 'invalid-email');

  // Trigger blur event
  trigger('#email', new Event('blur'));
  await tasksSettled();

  // Verify validation error appears
  const results = component.controller.results;
  expect(results.length).toBeGreaterThan(0);
  expect(results[0].valid).toBe(false);

  await fixture.stop(true);
});

Checklist

Validation rules are checked on submit
Invalid data prevents form submission
Valid data passes validation
Field-level validation triggers on blur
Error messages are accessible via controller

4. Testing complex component interactions

Goal: Test parent-child component communication, custom events, and state synchronization.

Steps

Test parent-child data binding:

import { createFixture } from '@aurelia/testing';
import { bindable } from '@aurelia/runtime';

describe('Component interactions', () => {
  it('should pass data from parent to child via bindable', async () => {
    class ChildComponent {
      @bindable value: string = '';
    }

    class ParentComponent {
      message = 'Hello from parent';
    }

    const { component, getBy, platform } = await createFixture
      .component(ParentComponent)
      .html`<div>
        <child-component value.bind="message"></child-component>
      </div>`
      .deps(ChildComponent)
      .build()
      .started;

    await tasksSettled();

    // Get child component instance
    const childElement = getBy('child-component');
    const childComponent = childElement.au?.controller?.viewModel;

    // Verify data was passed to child
    expect(childComponent.value).toBe('Hello from parent');

    // Update parent data
    component.message = 'Updated message';
    await tasksSettled();

    // Verify child received update
    expect(childComponent.value).toBe('Updated message');

    await fixture.stop(true);
  });
});

Test child-to-parent communication via custom events:

it('should emit custom events from child to parent', async () => {
  class ChildComponent {
    sendMessage() {
      this.dispatchCustomEvent('message-sent', { text: 'Hello parent!' });
    }

    private dispatchCustomEvent(name: string, detail: any) {
      const event = new CustomEvent(name, { detail, bubbles: true });
      this.element.dispatchEvent(event);
    }
  }

  class ParentComponent {
    receivedMessage = '';

    handleMessage(event: CustomEvent) {
      this.receivedMessage = event.detail.text;
    }
  }

  const { component, trigger, platform } = await createFixture
    .component(ParentComponent)
    .html`<div>
      <child-component message-sent.trigger="handleMessage($event)"></child-component>
    </div>`
    .deps(ChildComponent)
    .build()
    .started;

  // Trigger child method that dispatches event
  const childElement = fixture.getBy('child-component');
  const childComponent = childElement.au?.controller?.viewModel;

  childComponent.sendMessage();
  await tasksSettled();

  // Verify parent received message
  expect(component.receivedMessage).toBe('Hello parent!');

  await fixture.stop(true);
});

Test sibling component communication via shared service:

it('should synchronize state between siblings via service', async () => {
  class SharedState {
    @observable count = 0;

    increment() {
      this.count++;
    }
  }

  class ComponentA {
    private state = resolve(SharedState);

    increment() {
      this.state.increment();
    }

    get count() {
      return this.state.count;
    }
  }

  class ComponentB {
    private state = resolve(SharedState);

    get count() {
      return this.state.count;
    }
  }

  const { getBy, trigger, platform } = await createFixture
    .component(class App {})
    .html`<div>
      <component-a></component-a>
      <component-b></component-b>
    </div>`
    .deps(SharedState, ComponentA, ComponentB)
    .build()
    .started;

  const compA = getBy('component-a').au?.controller?.viewModel;
  const compB = getBy('component-b').au?.controller?.viewModel;

  // Initial state
  expect(compA.count).toBe(0);
  expect(compB.count).toBe(0);

  // Increment from component A
  compA.increment();
  await tasksSettled();

  // Verify both components reflect the change
  expect(compA.count).toBe(1);
  expect(compB.count).toBe(1);

  await fixture.stop(true);
});

Checklist

Parent-to-child data flows via @bindable
Child-to-parent communication works via events
Sibling components share state via services
Changes propagate correctly across component tree
Custom events are dispatched and handled

5. Testing lifecycle hooks in complex scenarios

Goal: Test components with complex initialization, async lifecycle hooks, and cleanup operations.

Steps

Test async data loading in lifecycle hooks:

import { createFixture } from '@aurelia/testing';

describe('Lifecycle hooks', () => {
  it('should complete async attached hook before rendering', async () => {
    let attachedCompleted = false;
    const loadedData = { id: 1, name: 'Test' };

    class AsyncComponent {
      data: any = null;

      async attached() {
        // Simulate API call
        await new Promise(resolve => setTimeout(resolve, 10));
        this.data = loadedData;
        attachedCompleted = true;
      }
    }

    const { component, assertText } = await createFixture
      .component(AsyncComponent)
      .html`<div>\${data?.name || 'Loading...'}</div>`
      .build()
      .started; // .started waits for all async lifecycle hooks

    // By the time .started resolves, attached() should be complete
    expect(attachedCompleted).toBe(true);
    expect(component.data).toEqual(loadedData);
    assertText('Test');

    await fixture.stop(true);
  });
});

Test cleanup in detaching/unbinding:

it('should cleanup resources in detaching hook', async () => {
  let cleanupCalled = false;
  let subscriptionActive = true;

  class ComponentWithCleanup {
    private intervalId: number | null = null;

    attached() {
      // Simulate subscription or interval
      this.intervalId = window.setInterval(() => {
        // Do something
      }, 1000);
      subscriptionActive = true;
    }

    detaching() {
      // Cleanup
      if (this.intervalId !== null) {
        window.clearInterval(this.intervalId);
        subscriptionActive = false;
        cleanupCalled = true;
      }
    }
  }

  const fixture = await createFixture
    .component(ComponentWithCleanup)
    .html`<div>Content</div>`
    .build()
    .started;

  expect(subscriptionActive).toBe(true);

  // Stop the fixture (triggers detaching)
  await fixture.stop(true);

  // Verify cleanup was called
  expect(cleanupCalled).toBe(true);
  expect(subscriptionActive).toBe(false);
});

Test lifecycle hook order:

it('should execute lifecycle hooks in correct order', async () => {
  const hookCalls: string[] = [];

  class LifecycleComponent {
    binding() {
      hookCalls.push('binding');
    }

    bound() {
      hookCalls.push('bound');
    }

    attaching() {
      hookCalls.push('attaching');
    }

    attached() {
      hookCalls.push('attached');
    }

    detaching() {
      hookCalls.push('detaching');
    }

    unbinding() {
      hookCalls.push('unbinding');
    }
  }

  const fixture = await createFixture
    .component(LifecycleComponent)
    .html`<div>Test</div>`
    .build()
    .started;

  // Verify initialization order
  expect(hookCalls).toEqual([
    'binding',
    'bound',
    'attaching',
    'attached'
  ]);

  hookCalls.length = 0; // Clear array

  await fixture.stop(true);

  // Verify cleanup order
  expect(hookCalls).toEqual([
    'detaching',
    'unbinding'
  ]);
});

Checklist

Async lifecycle hooks complete before component is ready
Cleanup hooks properly dispose of resources
Hook execution order is correct
.started waits for all async hooks to complete
stop(true) triggers cleanup hooks

6. Testing with real-world dependencies

Goal: Test components that depend on multiple services, handle complex state, and integrate with external systems.

Steps

Create comprehensive mocks for service dependencies:

import { Registration } from '@aurelia/kernel';

// Mock services
class MockAuthService {
  isAuthenticated = true;
  currentUser = { id: '1', name: 'Test User' };

  async login(email: string, password: string) {
    return email === '[email protected]' && password === 'password';
  }

  logout() {
    this.isAuthenticated = false;
    this.currentUser = null;
  }
}

class MockApiService {
  private responses = new Map<string, any>();

  setResponse(endpoint: string, data: any) {
    this.responses.set(endpoint, data);
  }

  async get(endpoint: string) {
    if (!this.responses.has(endpoint)) {
      throw new Error(`No mock data for ${endpoint}`);
    }
    return this.responses.get(endpoint);
  }

  async post(endpoint: string, data: any) {
    return { success: true, data };
  }
}

class MockNotificationService {
  notifications: Array<{ type: string; message: string }> = [];

  success(message: string) {
    this.notifications.push({ type: 'success', message });
  }

  error(message: string) {
    this.notifications.push({ type: 'error', message });
  }

  clear() {
    this.notifications = [];
  }
}

Test component with multiple service dependencies:

import { resolve } from '@aurelia/kernel';

describe('Complex component integration', () => {
  it('should coordinate multiple services for user dashboard', async () => {
    class UserDashboard {
      private auth = resolve(AuthService);
      private api = resolve(ApiService);
      private notifications = resolve(NotificationService);

      userData: any = null;
      loading = false;
      error: string | null = null;

      async attached() {
        if (!this.auth.isAuthenticated) {
          this.error = 'Not authenticated';
          return;
        }

        this.loading = true;

        try {
          this.userData = await this.api.get(`/users/${this.auth.currentUser.id}`);
          this.notifications.success('Dashboard loaded');
        } catch (error) {
          this.error = 'Failed to load dashboard';
          this.notifications.error('Failed to load dashboard');
        } finally {
          this.loading = false;
        }
      }

      async updateProfile(data: any) {
        try {
          await this.api.post(`/users/${this.auth.currentUser.id}`, data);
          this.notifications.success('Profile updated');
          return true;
        } catch {
          this.notifications.error('Failed to update profile');
          return false;
        }
      }
    }

    const mockAuth = new MockAuthService();
    const mockApi = new MockApiService();
    const mockNotifications = new MockNotificationService();

    // Configure mock API responses
    mockApi.setResponse('/users/1', {
      id: '1',
      name: 'Test User',
      email: '[email protected]'
    });

    const { component, platform } = await createFixture
      .component(UserDashboard)
      .html`<div>
        <div if.bind="loading">Loading...</div>
        <div if.bind="error">\${error}</div>
        <div if.bind="userData">\${userData.name}</div>
      </div>`
      .deps(
        Registration.instance(AuthService, mockAuth),
        Registration.instance(ApiService, mockApi),
        Registration.instance(NotificationService, mockNotifications)
      )
      .build()
      .started;

    // Wait for attached() to complete
    await tasksSettled();

    // Verify data was loaded
    expect(component.userData).toBeTruthy();
    expect(component.userData.name).toBe('Test User');
    expect(component.loading).toBe(false);
    expect(mockNotifications.notifications.length).toBe(1);
    expect(mockNotifications.notifications[0].type).toBe('success');

    // Test update
    const success = await component.updateProfile({ name: 'Updated Name' });
    expect(success).toBe(true);
    expect(mockNotifications.notifications.length).toBe(2);

    await fixture.stop(true);
  });
});

Test error scenarios and recovery:

it('should handle service failures gracefully', async () => {
  class ErrorProneComponent {
    private api = resolve(ApiService);
    private notifications = resolve(NotificationService);

    data: any = null;
    error: string | null = null;

    async loadData() {
      try {
        this.error = null;
        this.data = await this.api.get('/data');
      } catch (error) {
        this.error = 'Failed to load data';
        this.notifications.error('Failed to load data');
      }
    }

    async retry() {
      await this.loadData();
    }
  }

  const mockApi = new MockApiService();
  const mockNotifications = new MockNotificationService();

  let callCount = 0;
  mockApi.get = async (endpoint: string) => {
    callCount++;
    if (callCount === 1) {
      throw new Error('Service unavailable');
    }
    return { success: true };
  };

  const { component, platform } = await createFixture
    .component(ErrorProneComponent)
    .html`<div>
      <button click.trigger="loadData()">Load</button>
      <button if.bind="error" click.trigger="retry()">Retry</button>
    </div>`
    .deps(
      Registration.instance(ApiService, mockApi),
      Registration.instance(NotificationService, mockNotifications)
    )
    .build()
    .started;

  // First load fails
  await component.loadData();
  await tasksSettled();

  expect(component.error).toBeTruthy();
  expect(component.data).toBeNull();
  expect(callCount).toBe(1);

  // Retry succeeds
  await component.retry();
  await tasksSettled();

  expect(component.error).toBeNull();
  expect(component.data).toBeTruthy();
  expect(callCount).toBe(2);

  await fixture.stop(true);
});

Checklist

Multiple service dependencies are properly mocked
Service interactions are tested in integration
Error scenarios are tested and handled
Retry/recovery mechanisms work correctly
Mock services provide realistic behavior

Testing pattern cheat sheet

Scenario

Key Approach

Tools/APIs

Async API calls

Mock HTTP client + await tasksSettled()

MockHttpClient, await tasksSettled()

Router navigation

Router configuration + router.load()

RouterConfiguration, IRouter

Form validation

Validation rules + controller

IValidationRules, IValidationController

Component interaction

Bindables + custom events

@bindable, CustomEvent

Lifecycle hooks

Hook execution + timing

.started, stop(true)

Service dependencies

Mock registrations

Registration.instance(), mock services

Best practices

Always await .started: Ensures all async lifecycle hooks complete
Use await tasksSettled(): After async operations or state changes
Mock external dependencies: HTTP clients, auth services, APIs
Test error paths: Don't just test happy scenarios
Clean up with stop(true): Prevents memory leaks and interference
Isolate tests: Each test should be independent
Use descriptive test names: Clear "should..." statements
Test user interactions: Clicks, typing, form submission
Verify state changes: Check both component properties and DOM
Test accessibility: Verify ARIA attributes and keyboard navigation

Outcome Recipes

1. Testing components with async API calls

Steps

Checklist

2. Testing router navigation and route parameters

Steps

Checklist

3. Testing with validation

Steps

Checklist

4. Testing complex component interactions

Steps

Checklist

5. Testing lifecycle hooks in complex scenarios

Steps

Checklist

6. Testing with real-world dependencies

Steps

Checklist

Testing pattern cheat sheet

Best practices

See also