Just about every time I set up a new `Context.Provider`, I end up accidentally specifying a `values` prop rather than `value`.  While it's a minor error, generally I build the container in which the provider resides and commit it to the code base before I ever use it.  It's only later when I go to use it that I realize I did it again.  Since the `Context.Provider` seems pretty much useless without a `value` prop specified, I'd love it if there was a prop error if it is missing... especially if another prop is defined on the `Context.Provider` instead.
render() {
        return <div>{this.props.children}</div>;
      }
    }
    const renderer = ReactTestRenderer.create(<Component>Hi</Component>);
    expect(renderer.toJSON()).toEqual({
      type: 'div',
      children: ['Hi'],
      props: {},
    });
    renderer.update(<Component>{['Hi', 'Bye']}</Component>);
    expect(renderer.toJSON()).toEqual({
      type: 'div',
      children: ['Hi', 'Bye'],
      props: {},
    });
    renderer.update(<Component>Bye</Component>);
    expect(renderer.toJSON()).toEqual({
      type: 'div',
      children: ['Bye'],
      props: {},
    });
    renderer.update(<Component>{42}</Component>);
    expect(renderer.toJSON()).toEqual({
      type: 'div',
      children: ['42'],
      props: {},