if (isNullOrEmpty(value)) {
        throw new IllegalArgumentException("value of key " + key + " omitted");
      }
      try {
        char lastChar = value.charAt(value.length() - 1);
        TimeUnit timeUnit;
        switch (lastChar) {
          case 'd':
            timeUnit = TimeUnit.DAYS;
            break;
          case 'h':

        if (utf8Length != Utf8.encodedLength(sb)) {
          StringBuilder repro = new StringBuilder();
          for (int j = 0; j < sb.length(); j++) {
            repro.append(" ").append((int) sb.charAt(j)); // GWT compatible
          }
          assertEquals(repro.toString(), utf8Length, Utf8.encodedLength(sb));
        }
      }
    }
  }

  public void testEncodedLength_invalidStrings() {

    for (String edge : edges) {
      checkArgument(
          edge.length() == 2, "Expecting each edge to consist of 2 characters but got %s", edge);
      char node1 = edge.charAt(0);
      char node2 = edge.charAt(1);
      graphMapBuilder.put(node1, node2);
      if (!directed) {
        graphMapBuilder.put(node2, node1);
      }
    }

  public void testFlatteningToImmutableListMultimap() {
    Collector<String, ?, ImmutableListMultimap<Character, Character>> collector =
        ImmutableListMultimap.flatteningToImmutableListMultimap(
            str -> str.charAt(0), str -> Chars.asList(str.substring(1).toCharArray()).stream());
    BiPredicate<Multimap<?, ?>, Multimap<?, ?>> equivalence =
        Equivalence.equals()

      new Function<@Nullable String, @Nullable Character>() {
        @Override
        public @Nullable Character apply(@Nullable String input) {
          return input == null ? null : input.charAt(0);
        }
      };

  abstract static class ColumnMapTests extends MapMapTests {
    ColumnMapTests(
        boolean allowsNullValues,
        boolean supportsRemove,
        boolean supportsClear,

  @Generates
  Byte generateByteObject() {
    return new Byte(generateByte());
  }

  @Generates
  char generateChar() {
    return generateString().charAt(0);
  }

  @SuppressWarnings("removal") // b/321209431 -- maybe just use valueOf here?
  @Generates
  Character generateCharacter() {
    return new Character(generateChar());
  }

  @Generates

    String expected = begin + end;
    assertEquals(expected.charAt(0), joinedReader.read());
    CharStreams.skipFully(joinedReader, 1);
    assertEquals(expected.charAt(2), joinedReader.read());
    CharStreams.skipFully(joinedReader, 4);
    assertEquals(expected.charAt(7), joinedReader.read());
    CharStreams.skipFully(joinedReader, 1);
    assertEquals(expected.charAt(9), joinedReader.read());
    assertEquals(-1, joinedReader.read());

    for (int i = 0; i < charsToRead; i++) {
      target.put(seq.charAt(pos++));
    }
    return charsToRead;
  }

  @Override
  public synchronized int read() throws IOException {
    checkOpen();
    requireNonNull(seq); // safe because of checkOpen
    return hasRemaining() ? seq.charAt(pos++) : -1;
  }

  @Override

  public static final CharMatcher OLD_WHITESPACE =
      new CharMatcher() {
        @Override
        public boolean matches(char c) {
          return OLD_WHITESPACE_TABLE.charAt(c % 79) == c;
        }
      };

  @Param private boolean useNew;

  @Param({"20", "50", "80"})
  private int percentMatching;

  private String teststring;
  private CharMatcher matcher;

    checkNotNull(a);
    checkNotNull(b);

    int maxPrefixLength = Math.min(a.length(), b.length());
    int p = 0;
    while (p < maxPrefixLength && a.charAt(p) == b.charAt(p)) {
      p++;
    }
    if (validSurrogatePairAt(a, p - 1) || validSurrogatePairAt(b, p - 1)) {
      p--;
    }
    return a.subSequence(0, p).toString();
  }

  /**