message: Fix test failure on windows.
diff: @@ -637,7 +637,7 @@ mod test {
  #[test]
  fn test_make_filename_safe_truncates_long_strings() {
  - let input = "This is a very long string. It is too long to be safe as a directory name, and so it needs to be truncated. What a long string this is.";
  + let input = "this is a very long string. it is too long to be safe as a directory name, and so it needs to be truncated. what a long string this is.";
  let safe = make_filename_safe(input);
  assert!(input.len() > MAX_DIRECTORY_NAME_LEN);
  assert_eq!(&input[0..MAX_DIRECTORY_NAME_LEN], &safe);
  @@ -653,9 +653,9 @@ mod test {
  #[test]
  fn test_benchmark_id_make_directory_name_unique() {
  let existing_id = BenchmarkId::new(
  - "Group".to_owned(),
  - Some("Function".to_owned()),
  - Some("Value".to_owned()),
  + "group".to_owned(),
  + Some("function".to_owned()),
  + Some("value".to_owned()),
  None,
  );
  let mut directories = HashSet::new();
  @@ -663,12 +663,12 @@ mod test {
  let mut new_id = existing_id.clone();
  new_id.ensure_directory_name_unique(&directories);
  - assert_eq!("Group/Function/Value_2", new_id.as_directory_name());
  + assert_eq!("group/function/value_2", new_id.as_directory_name());
  directories.insert(new_id.as_directory_name().to_owned());
  new_id = existing_id.clone();
  new_id.ensure_directory_name_unique(&directories);
  - assert_eq!("Group/Function/Value_3", new_id.as_directory_name());
  + assert_eq!("group/function/value_3", new_id.as_directory_name());
  directories.insert(new_id.as_directory_name().to_owned());
  }
  }
  