message: Normalize the file path in the dirty check test
diff: import { InputFile, InputFileSet } from '@cmt/dirty';
  +import * as util from '@cmt/util';
  import {expect} from '@test/util';
  import * as path from 'path';
  import { fs } from '@cmt/pr';
  @@ -65,7 +66,7 @@ suite('Dirty file checking', async () => {
  test('Input file set maps files correctly', async () => {
  const foo_subdir = path.join(here, 'foo');
  - const dummy_file = path.join(foo_subdir, 'dummy_file');
  + const dummy_file = util.normalizePath(path.join(foo_subdir, 'dummy_file'));
  const fileset = await InputFileSet.create({
  buildFiles: [{
  isCMake: false,
  