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.
expect(tree.instance).toBeInstanceOf(Bam);
    expect(tree.rendered.instance).toBeInstanceOf(Bar);
    cleanNodeOrArray(tree);
    expect(prettyFormat(tree)).toEqual(
      prettyFormat({
        type: Bam,
        nodeType: 'component',
        props: {},
        instance: null,
        rendered: {
          type: Bar,
          nodeType: 'component',
          props: {special: true},
          instance: null,
          rendered: {
            type: Foo,
            nodeType: 'component',
            props: {className: 'special'},
            instance: null,
            rendered: {
              type: 'div',
              nodeType: 'host',
              props: {className: 'Foo special'},
              instance: null,
              rendered: [
                {
                  type: 'span',
                  nodeType: 'host',
                  props: {className: 'Foo2'},