React Unit Testing Example 5

LoadingIndicator.test.js

  describe('when isLoading is true', () => {
    describe('given 200ms have not yet elapsed', () => {
      it('should render nothing', () => {
        const wrapper = mount(
          <LoadingIndicator isLoading={true}>
            <div>ahoy!</div>
          </LoadingIndicator>
        );
        expect(wrapper.html()).toBe(null);
        wrapper.unmount();
      });
    });
  });