public Map<String, Diff> diffs() {
    if (diffs.containsKey(ASSIGNEE)) {
      Map<String, Diff> result = new LinkedHashMap<>(diffs);
      result.put(ASSIGNEE, decode(result.get(ASSIGNEE)));
      return result;
    }
    return diffs;
  }
@Test
  public void diffs_should_be_empty_by_default() {
    assertThat(diffs.diffs()).isEmpty();
  }