Warning: the current testing environment is not configured to support act(…)

The warning message “the current testing environment is not configured to support act(…)” usually occurs when trying to use the act() function in a testing environment that is not properly set up or configured.

The act() function is provided by testing libraries such as ReactDOM or React Testing Library, and it is used for safely running code that causes React state updates and re-renders in tests. It ensures that all updates are processed correctly and state changes are synchronized.

To fix this warning, you should check if you are using the act() function in the correct context. It should be used inside a testing function, such as a test case or a callback function passed to a testing utility.

Here’s an example of how to use act() correctly in a React component test using React Testing Library:

    import { render, act } from '@testing-library/react';
    import MyComponent from './MyComponent';

    test('MyComponent updates state correctly', () => {
      // Render the component
      const { container } = render();

      // Perform an action that triggers a state update
      act(() => {
        // Simulate a button click or any other interaction
        // that updates the component's state
        container.querySelector('button').click();
      });

      // Assert that the component rendered correctly after the state update
      expect(container.textContent).toBe('Updated state: true');
    });