Having the following testing file:

import { render } from '@testing-library/react';

import '@testing-library/jest-dom';
import TaskModal from './task-modal';

describe('TaskModal', () => {
  const title = 'title';
  const selectedOption = { id: '1', name: 'test' };
  const options = [{ id: '1', name: 'test' }];
  it('should render successfully', () => {
    const { baseElement, getByText } = render(
      <TaskModal
        title={title}
        open={true}
        toggle={jest.fn()}
        initialScriptNameSelectedOption={selectedOption}
        scriptNameOptions={options}
      />
    );
    expect(baseElement).toBeTruthy();
    expect(getByText(title)).toBeTruthy();
  });

  it('should check if TaskModal renders Textarea successfully', () => {
    const { getByTestId } = render(
      <TaskModal
        hasTextarea
        title={title}
        open={true}
        toggle={jest.fn()}
        initialScriptNameSelectedOption={selectedOption}
        scriptNameOptions={options}
      />
    );
    const textarea = getByTestId('has-textarea');
    expect(textarea).toBeInTheDocument();
  });
});

When I run each test separately they pass, when I run the whole file, the second test fails with the following message:

Error: Uncaught [ReferenceError: IntersectionObserver is not defined]

Why is this happening?