message: RotMatrix --> Matrix3d to fix Cube.test.tsx
diff: *--------------------------------------------------------------------------------------------*/
  import { mount, shallow } from "enzyme";
  import * as React from "react";
  -import { RotMatrix } from "@bentley/geometry-core";
  +import { Matrix3d } from "@bentley/geometry-core";
  import { Cube } from "../../src/index";
  describe("Cube", () => {
  describe("<Cube />", () => {
  it("should render", () => {
  - const r = RotMatrix.createIdentity();
  + const r = Matrix3d.createIdentity();
  mount(<Cube rotMatrix={r} />);
  });
  it("renders correctly", () => {
  - const r = RotMatrix.createIdentity();
  + const r = Matrix3d.createIdentity();
  shallow(<Cube rotMatrix={r} />).should.matchSnapshot();
  });
  });
  