@Test
public void uniqueIssueKeys() throws Exception {

    ChangeLogSet<ChangeLogSet.Entry> entries = build( "TST-123", "TST-123", "TST-123", "TST-124",
                                                      "TST-123", "TST-124", "TST-125");
    Collection<String> keys = JiraSCMListener.getIssueKeys( entries, JiraSite.DEFAULT_ISSUE_PATTERN );
    Assert.assertEquals(3, keys.size());
}