message: update tests to match new rendering method
diff: @@ -47,7 +47,7 @@ const button4 = <Button key={4}>d</Button>;
  describe("RovingTabIndex", () => {
  it("RovingTabIndexProvider renders children as expected", () => {
  const wrapper = mount(<RovingTabIndexProvider>
  - <div><span>Test</span></div>
  + {() => <div><span>Test</span></div> }
  </RovingTabIndexProvider>);
  expect(wrapper.text()).toBe("Test");
  expect(wrapper.html()).toBe('<div><span>Test</span></div>');
  @@ -55,9 +55,11 @@ describe("RovingTabIndex", () => {
  it("RovingTabIndexProvider works as expected with useRovingTabIndex", () => {
  const wrapper = mount(<RovingTabIndexProvider>
  + {() => <React.Fragment>
  { button1 }
  { button2 }
  { button3 }
  + </React.Fragment>}
  </RovingTabIndexProvider>);
  // should begin with 0th being active
  @@ -95,6 +97,7 @@ describe("RovingTabIndex", () => {
  it("RovingTabIndexProvider works as expected with RovingTabIndexWrapper", () => {
  const wrapper = mount(<RovingTabIndexProvider>
  + {() => <React.Fragment>
  { button1 }
  { button2 }
  <RovingTabIndexWrapper>
  @@ -102,6 +105,7 @@ describe("RovingTabIndex", () => {
  <button onFocus={onFocus} tabIndex={isActive ? 0 : -1} ref={ref}>.</button>
  }
  </RovingTabIndexWrapper>
  + </React.Fragment>}
  </RovingTabIndexProvider>);
  // should begin with 0th being active
  