assertEquals(empty, Maps.subMap(map, Range.atMost(0)));
    assertEquals(ImmutableSortedMap.of(2, 0, 4, 0), Maps.subMap(map, Range.atMost(4)));
    assertEquals(ImmutableSortedMap.of(2, 0, 4, 0, 6, 0), Maps.subMap(map, Range.atMost(7)));
    assertEquals(map, Maps.subMap(map, Range.atMost(20)));
  }

  @GwtIncompatible // NavigableMap
  public void testSubMap_unboundedRange() {

    }

    /**
     * @param tf
     * @param tdom
     * @param thost
     * @return
     */
    protected boolean matches(CIFSContext tf, String thost, String tdom) {
        return Objects.equals(this.getCredentials(), tf.getCredentials()) && Objects.equals(this.targetHost, thost)
                && Objects.equals(this.targetDomain, tdom);
    }