basico-libreriasui/src/ContainerFlex/ContainerFlex.spec.js

Esta es una libreria en la que tu podras importar componentes de mi practica de platzi

import { render } from '@testing-library/react';
import '@testing-library/jest-dom/extend-expect';
import ContainerFlex from './ContainerFlex';

describe('@componets/ContainerFlex', () => {
  it('onmwedoifnwonf', () => {
    //arrange
    const { getByRole } = render(
      <ContainerFlex role="banner" bgColor="blue" />
    );
    //act
    const ContainerFlexTest = getByRole('banner');
    //assert
    expect(ContainerFlexTest).toBeDefined();
  });
  it('Comprobar si tiene background azul', () => {
    // arrange

    const { getByRole } = render(
      <ContainerFlex role="banner" bgColor="blue" />
    );
    // act

    const ContainerFlexTest = getByRole('banner');
    // assert
    expect(ContainerFlexTest).toHaveStyle('background-color:blue;');
  });
});