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 <InnerRefed ref={r => (this.ref = r)} />;
      }
    }
    const renderer = ReactTestRenderer.create(<App />);
    const tree = renderer.toTree();
    cleanNodeOrArray(tree);
    expect(prettyFormat(tree)).toEqual(
      prettyFormat({
        instance: null,
        nodeType: 'component',
        props: {},
        rendered: {
          instance: null,
          nodeType: 'host',
          props: {},
          rendered: [
            {
              instance: null,
              nodeType: 'host',
              props: {},
              rendered: [],
              type: 'span',
            },
          ],