Not being able to test hover styles with jest-dom and styled components

When using styled components in combination with jest-dom for testing, you may encounter difficulties in testing hover styles. This can be frustrating, as hover styles are an important aspect of user interaction and can significantly impact the user experience. In this blog post, we will explore different solutions to overcome this challenge.

Solution 1: Using fireEvent

One way to test hover styles is by simulating the hover event using the fireEvent method provided by the testing library. Here’s an example of how you can achieve this:


    import { render, fireEvent } from '@testing-library/react';
    import MyComponent from './MyComponent';
    
    test('hover styles are applied', () => {
      const { getByTestId } = render();
      const myElement = getByTestId('my-element');
      
      fireEvent.mouseEnter(myElement);
      
      expect(myElement).toHaveStyle('background-color: blue;');
    });

In this example, we render the component containing the element we want to test. We then use the getByTestId method to retrieve the element by its data-testid attribute. We simulate the mouseEnter event using fireEvent.mouseEnter and assert that the element has the expected style using the toHaveStyle matcher from jest-dom.

Solution 2: Using a wrapper component

Another approach is to create a wrapper component specifically for testing hover styles. This wrapper component can be used to encapsulate the component you want to test and provide a way to toggle the hover state. Here’s an example:


    import { render } from '@testing-library/react';
    import { HoverWrapper } from './HoverWrapper';
    import MyComponent from './MyComponent';
    
    test('hover styles are applied', () => {
      const { getByTestId } = render(
        
          
        
      );
      
      const myElement = getByTestId('my-element');
      
      expect(myElement).toHaveStyle('background-color: blue;');
    });

In this example, we create a HoverWrapper component that wraps the component we want to test. The HoverWrapper component can manage the hover state and apply the necessary styles. We then render the wrapped component and assert that the element has the expected style.

Conclusion

Testing hover styles with jest-dom and styled components can be challenging, but there are multiple solutions available. You can use the fireEvent method to simulate the hover event, or create a wrapper component to manage the hover state. Choose the solution that best fits your testing needs and ensure that your hover styles are properly tested to provide a seamless user experience.

Not being able to test hover styles with jest-dom and styled components