# Testing Instructions

## Framework and Tools
- Use **Jest** as the testing framework.
- For unit tests, utilize **Spectator** to simplify Angular component testing.

## Guidelines
1. **Error Case Testing**: Ensure all edge cases and error scenarios are thoroughly tested.
2. **Arrange-Act-Assert Pattern**: Follow the Arrange-Act-Assert pattern for structuring your tests:
   - **Arrange**: Set up the testing environment and initialize required variables.
   - **Act**: Execute the functionality being tested.
   - **Assert**: Verify the expected outcomes.

## Best Practices
- Write clear and descriptive test names.
- Ensure tests are isolated and do not depend on each other.
- Mock external dependencies to avoid side effects.
- Aim for high code coverage without compromising test quality.

## Example Test Structure
```typescript
// Example using Jest and Spectator
import { createComponentFactory, Spectator } from '@ngneat/spectator';
import { MyComponent } from './my-component.component';

describe('MyComponent', () => {
  let spectator: Spectator<MyComponent>;
  const createComponent = createComponentFactory(MyComponent);

  beforeEach(() => {
    spectator = createComponent();
  });

  it('should display the correct title', () => {
    // Arrange
    const expectedTitle = 'Hello World';

    // Act
    spectator.component.title = expectedTitle;
    spectator.detectChanges();

    // Assert
    expect(spectator.query('h1')).toHaveText(expectedTitle);
  });

  it('should handle error cases gracefully', () => {
    // Arrange
    const invalidInput = null;

    // Act
    spectator.component.input = invalidInput;

    // Assert
    expect(() => spectator.component.processInput()).toThrowError('Invalid input');
  });
});
```

## Additional Resources
- [Jest Documentation](https://jestjs.io/docs/getting-started)
- [Spectator Documentation](https://ngneat.github.io/spectator/)