@Override
    public Set<Entry<Integer, R>> entrySet() {
        assert baseDirInitialized();
        return entrySet;
    }
@Issue("JENKINS-18065")
    @Test
    public void entrySetContains() {
        for (Map.Entry<Integer, Build> e : a.entrySet()) {
            assertTrue(a.entrySet().contains(e));
        }
    }