Testing Aurelia Components with Aurelia-Testing

Aurelia-Testing is a testing library for Aurelia applications that provides a simple and intuitive API for writing unit tests and integration tests. In this article, we will explore how to use Aurelia-Testing to test Aurelia components.

Setting up Aurelia-Testing

To use Aurelia-Testing, you need to install the `aurelia-testing` package using npm or yarn:

npm install aurelia-testing --save-dev

or

yarn add aurelia-testing --dev

Writing Unit Tests for Aurelia Components

Aurelia-Testing provides a `StageComponent` class that allows you to create a test host for your component. Here's an example of how to write a unit test for a simple Aurelia component:

import { StageComponent } from 'aurelia-testing';
import { bootstrap } from 'aurelia-bootstrapper';
import { MyComponent } from './my-component';

describe('MyComponent', () => {
  let component;

  beforeEach(async () => {
    component = StageComponent
      .withResources(MyComponent)
      .inView('')
      .boundTo({});
  });

  it('should render the component', async () => {
    await component.create(bootstrap);
    expect(component.element).not.toBeNull();
  });

  it('should display the correct text', async () => {
    await component.create(bootstrap);
    expect(component.element.textContent).toContain('Hello World!');
  });
});

Writing Integration Tests for Aurelia Components

Aurelia-Testing also provides a `StageComponent` class that allows you to create a test host for your component and test its interactions with other components. Here's an example of how to write an integration test for a simple Aurelia component:

import { StageComponent } from 'aurelia-testing';
import { bootstrap } from 'aurelia-bootstrapper';
import { MyComponent } from './my-component';
import { MyChildComponent } from './my-child-component';

describe('MyComponent', () => {
  let component;

  beforeEach(async () => {
    component = StageComponent
      .withResources(MyComponent, MyChildComponent)
      .inView('')
      .boundTo({});
  });

  it('should render the component and its child', async () => {
    await component.create(bootstrap);
    expect(component.element).not.toBeNull();
    expect(component.element.querySelector('my-child-component')).not.toBeNull();
  });

  it('should display the correct text in the child component', async () => {
    await component.create(bootstrap);
    expect(component.element.querySelector('my-child-component').textContent).toContain('Hello Child!');
  });
});

Testing Aurelia Components with Mocks

Aurelia-Testing provides a `Mock` class that allows you to create mock objects for your dependencies. Here's an example of how to write a unit test for a simple Aurelia component that uses a mock:

import { StageComponent } from 'aurelia-testing';
import { bootstrap } from 'aurelia-bootstrapper';
import { MyComponent } from './my-component';
import { MyService } from './my-service';

describe('MyComponent', () => {
  let component;
  let mockService;

  beforeEach(async () => {
    mockService = {
      getData: () => Promise.resolve('Mock Data')
    };

    component = StageComponent
      .withResources(MyComponent)
      .inView('')
      .boundTo({ myService: mockService });
  });

  it('should render the component with mock data', async () => {
    await component.create(bootstrap);
    expect(component.element.textContent).toContain('Mock Data');
  });
});

Testing Aurelia Components with Spies

Aurelia-Testing provides a `Spy` class that allows you to create spy objects for your dependencies. Here's an example of how to write a unit test for a simple Aurelia component that uses a spy:

import { StageComponent } from 'aurelia-testing';
import { bootstrap } from 'aurelia-bootstrapper';
import { MyComponent } from './my-component';
import { MyService } from './my-service';

describe('MyComponent', () => {
  let component;
  let spyService;

  beforeEach(async () => {
    spyService = {
      getData: jasmine.createSpy('getData')
    };

    component = StageComponent
      .withResources(MyComponent)
      .inView('')
      .boundTo({ myService: spyService });
  });

  it('should call the service method', async () => {
    await component.create(bootstrap);
    expect(spyService.getData).toHaveBeenCalledTimes(1);
  });
});

Conclusion

Aurelia-Testing provides a powerful and flexible API for testing Aurelia components. By using the `StageComponent` class, you can create test hosts for your components and test their interactions with other components. By using mocks and spies, you can isolate your dependencies and test your components in isolation.

FAQs

What is Aurelia-Testing?

Aurelia-Testing is a testing library for Aurelia applications that provides a simple and intuitive API for writing unit tests and integration tests.

How do I install Aurelia-Testing?

You can install Aurelia-Testing using npm or yarn by running the command `npm install aurelia-testing --save-dev` or `yarn add aurelia-testing --dev`.

How do I write unit tests for Aurelia components?

You can write unit tests for Aurelia components using the `StageComponent` class provided by Aurelia-Testing. You can create a test host for your component and test its interactions with other components.

How do I write integration tests for Aurelia components?

You can write integration tests for Aurelia components using the `StageComponent` class provided by Aurelia-Testing. You can create a test host for your component and test its interactions with other components.

How do I use mocks in Aurelia-Testing?

You can use mocks in Aurelia-Testing by creating mock objects for your dependencies. You can use the `Mock` class provided by Aurelia-Testing to create mock objects.

How do I use spies in Aurelia-Testing?

You can use spies in Aurelia-Testing by creating spy objects for your dependencies. You can use the `Spy` class provided by Aurelia-Testing to create spy objects.