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 this.props.children;
      }
    }
    const renderer = ReactTestRenderer.create(
      <div>
        <Foo>
          <div>One</div>
          <div>Two</div>
          <Foo>
            <div>Three</div>
          </Foo>
        </Foo>
        <div>Four</div>
      </div>,
    );
    const tree = renderer.toTree();
    cleanNodeOrArray(tree);
    expect(prettyFormat(tree)).toEqual(
      prettyFormat({
        type: 'div',