assertEquals(value, ResourceUtil.resolve(value));

        System.setProperty("abc", "123");

        value = "${abc}";
        assertEquals("123", ResourceUtil.resolve(value));

        value = "xxx${abc}zzz";
        assertEquals("xxx123zzz", ResourceUtil.resolve(value));

        value = "${abc.xyz}";
        assertEquals(value, ResourceUtil.resolve(value));

        System.setProperty("abc.xyz", "789");

    suite.addTest(testsForTransform());
    suite.addTestSuite(Collections2Test.class);
    return suite;
  }

  static final Predicate<@Nullable String> NOT_YYY_ZZZ =
      input -> !"yyy".equals(input) && !"zzz".equals(input);

  static final Predicate<String> LENGTH_1 = input -> input.length() == 1;

  @J2ktIncompatible
  @GwtIncompatible // suite
  private static Test testsForFilter() {

    suite.addTest(testsForTransform());
    suite.addTestSuite(Collections2Test.class);
    return suite;
  }

  static final Predicate<@Nullable String> NOT_YYY_ZZZ =
      input -> !"yyy".equals(input) && !"zzz".equals(input);

  static final Predicate<String> LENGTH_1 = input -> input.length() == 1;

  @J2ktIncompatible
  @GwtIncompatible // suite
  private static Test testsForFilter() {

  arrayOf(
    // HTTP formats required by RFC2616 but with any timezone:
    // RFC 822, updated by RFC 1123 with any TZ.
    "EEE, dd MMM yyyy HH:mm:ss zzz",
    // RFC 850, obsoleted by RFC 1036 with any TZ.
    "EEEE, dd-MMM-yy HH:mm:ss zzz",
    // ANSI C's asctime() format
    "EEE MMM d HH:mm:ss yyyy",
    // Alternative formats:
    "EEE, dd-MMM-yyyy HH:mm:ss z",
    "EEE, dd-MMM-yyyy HH-mm-ss z",

    testDecodesByBytes(base64Url(), "_zzz", new byte[] {-1, 60, -13});
    testDecodesByBytes(base64Url(), "-zzz", new byte[] {-5, 60, -13});
  }

  public void testBase64UrlInvalidDecodings() {
    assertFailsToDecode(base64Url(), "+zzz", "Unrecognized character: +");
    assertFailsToDecode(base64Url(), "/zzz", "Unrecognized character: /");
  }

  public void testBase32() {

    filtered.put("b", 2);
    assertEquals(ImmutableMap.of("a", 1, "b", 2), filtered);

    assertThrows(
        IllegalArgumentException.class,
        () -> filtered.putAll(ImmutableMap.of("c", 3, "zzz", 4, "b", 5)));

    assertEquals(ImmutableMap.of("a", 1, "b", 2), filtered);
  }

  public void testFilteredKeysFilteredReflectsBackingChanges() {
    Map<String, Integer> unfiltered = createUnfiltered();

    return formatDate(Date(System.currentTimeMillis() + timeUnit.toMillis(delta)))
  }

  private fun formatDate(date: Date): String? {
    val rfc1123: DateFormat = SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US)
    rfc1123.timeZone = TimeZone.getTimeZone("GMT")
    return rfc1123.format(date)
  }

                Set<String> unfiltered = Sets.newLinkedHashSet();
                unfiltered.add("yyy");
                Collections.addAll(unfiltered, elements);
                unfiltered.add("zzz");
                return Sets.filter(unfiltered, Collections2Test.NOT_YYY_ZZZ);
              }
            })
        .named("Sets.filter")
        .withFeatures(
            CollectionFeature.SUPPORTS_ADD,

    testDecodesByBytes(base64Url(), "_zzz", new byte[] {-1, 60, -13});
    testDecodesByBytes(base64Url(), "-zzz", new byte[] {-5, 60, -13});
  }

  public void testBase64UrlInvalidDecodings() {
    assertFailsToDecode(base64Url(), "+zzz", "Unrecognized character: +");
    assertFailsToDecode(base64Url(), "/zzz", "Unrecognized character: /");
  }

  public void testBase32() {

    @Override
    protected SortedSet<String> create(String[] elements) {
      List<String> list = Lists.newArrayList(elements);
      list.add("zzz");
      return ImmutableSortedSet.copyOf(list).headSet("zzy");
    }
  }

  public static class ImmutableSortedSetTailsetGenerator extends TestStringSortedSetGenerator {
    @Override