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.
nodeType: 'host',
          type: 'span',
          props: {className: 'Qoo'},
          instance: null,
          rendered: ['Hello World!'],
        },
      }),
    );
  });
  it('toTree() handles nested Fragments', () => {
    const Foo = () => (
      <>
        <>foo</>
      </>
    );
    const renderer = ReactTestRenderer.create(<Foo />);
    const tree = renderer.toTree();
    cleanNodeOrArray(tree);
    expect(prettyFormat(tree)).toEqual(
      prettyFormat({
        nodeType: 'component',
        type: Foo,
        instance: null,
        props: {},
        rendered: 'foo',
      }),
    );
  });
  it('toTree() handles null rendering components', () => {
    class Foo extends React.Component {