__tests__/ReactDOMComponent-test.js

ReactDOMComponent-test.js

    it('should report component containing invalid styles', () => {
      class Animal extends React.Component {
        render() {
          return <div style={1} />;
        }
      }

      expect(function() {
        ReactDOM.render(<Animal />, container);
      }).toThrowError(
        'The `style` prop expects a mapping from style properties to values, ' +
          "not a string. For example, style= " +
          'when using JSX.\n\nThis DOM node was rendered by `Animal`.',
      );
    });