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 render = props.children;
      return render(contextValue);
    }),
  );
  sharedContextTests(
    'readContext(Context) inside class component',
    Context =>
      class Consumer extends React.Component {
        render() {
          const observedBits = this.props.unstable_observedBits;
          const contextValue = readContext(Context, observedBits);
          const render = this.props.children;
          return render(contextValue);
        }
      },
  );
  sharedContextTests(
    'readContext(Context) inside pure class component',
    Context =>
      class Consumer extends React.PureComponent {
        render() {
          const observedBits = this.props.unstable_observedBits;
          const contextValue = readContext(Context, observedBits);
          const render = this.props.children;
          return render(contextValue);
        }
      },
  );
  function sharedContextTests(label, getConsumer) {