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.
);
    const tree = renderer.toTree();
    cleanNodeOrArray(tree);
    expect(prettyFormat(tree)).toEqual(
      prettyFormat({
        type: Foo,
        nodeType: 'component',
        props: {},
        instance: null,
        rendered: [
          {
            instance: null,
            nodeType: 'host',
            props: {},
            rendered: ['One'],
            type: 'div',
          },
          {
            instance: null,
            nodeType: 'host',
            props: {},
            rendered: ['Two'],
            type: 'div',
          },
        ],
      }),
    );
  });
  it('toTree() handles complicated tree of arrays', () => {
    class Foo extends React.Component {