@Test
  public void test_changelog() throws Exception {
    IssueChangelog changelog =
        new IssueChangelog(Collections.<FieldDiffs>emptyList(), Collections.<User>emptyList());
    when(changelogService.changelog(eq("ABCDE"), any(UserSession.class))).thenReturn(changelog);

    IssueChangelog result = service.changelog("ABCDE");

    assertThat(result).isSameAs(changelog);
  }
 public List<String> formatChangelog(FieldDiffs diffs) {
   return changelogService.formatDiffs(diffs);
 }
 public IssueChangelog changelog(Issue issue) {
   return changelogService.changelog(issue);
 }
 public IssueChangelog changelog(String issueKey) {
   return changelogService.changelog(issueKey);
 }