message: clean up XmlScope mocks between tests
diff: @@ -6,6 +6,8 @@ import { Program } from './Program';
  import { expectDiagnostics, trim } from './testHelpers.spec';
  import { standardizePath as s, util } from './util';
  let rootDir = s`${process.cwd()}/rootDir`;
  +import { createSandbox } from 'sinon';
  +const sinon = createSandbox();
  describe('XmlScope', () => {
  let program: Program;
  @@ -13,10 +15,12 @@ describe('XmlScope', () => {
  program = new Program({
  rootDir: rootDir
  });
  + sinon.restore();
  });
  afterEach(() => {
  program.dispose();
  + sinon.restore();
  });
  describe('constructor', () => {
  