// These have a combination of invalid length, unrecognized characters and wrong padding.
    assertFailsToDecode(base32(), "AB=C", "Unrecognized character: =");
    assertFailsToDecode(base32(), "A=BCDE", "Invalid input length 6");
    assertFailsToDecode(base32(), "?", "Invalid input length 1");
  }

  public void testBase32UpperCaseIsNoOp() {
    assertThat(base32().upperCase()).isSameInstanceAs(base32());
  }

    // These have a combination of invalid length, unrecognized characters and wrong padding.
    assertFailsToDecode(base32(), "AB=C", "Unrecognized character: =");
    assertFailsToDecode(base32(), "A=BCDE", "Invalid input length 6");
    assertFailsToDecode(base32(), "?", "Invalid input length 1");
  }

  public void testBase32UpperCaseIsNoOp() {
    assertThat(base32().upperCase()).isSameInstanceAs(base32());
  }

    tester.testAllPublicInstanceMethods(matcher);
  }

  public void testNoMatches() {
    doTestNoMatches(CharMatcher.none(), "blah");
    doTestNoMatches(is('a'), "bcde");
    doTestNoMatches(isNot('a'), "aaaa");
    doTestNoMatches(anyOf(""), "abcd");
    doTestNoMatches(anyOf("x"), "abcd");
    doTestNoMatches(anyOf("xy"), "abcd");
    doTestNoMatches(anyOf("CharMatcher"), "zxqy");

    tester.testAllPublicInstanceMethods(matcher);
  }

  public void testNoMatches() {
    doTestNoMatches(CharMatcher.none(), "blah");
    doTestNoMatches(is('a'), "bcde");
    doTestNoMatches(isNot('a'), "aaaa");
    doTestNoMatches(anyOf(""), "abcd");
    doTestNoMatches(anyOf("x"), "abcd");
    doTestNoMatches(anyOf("xy"), "abcd");
    doTestNoMatches(anyOf("CharMatcher"), "zxqy");

    assertEqualCharNodes(traverser.breadthFirst(charactersOf("bc")), "bcda");
  }

  @Test
  public void forGraph_breadthFirst_twoCycles() {
    Traverser<Character> traverser = Traverser.forGraph(TWO_CYCLES_GRAPH);
    assertEqualCharNodes(traverser.breadthFirst('a'), "abcd");
    assertEqualCharNodes(traverser.breadthFirst('b'), "bcda");
    assertEqualCharNodes(traverser.breadthFirst('c'), "cdab");

    assertEquals(2, CharStreams.readLines(r, conditional).intValue());
    assertEquals("ab", sb.toString());
  }

  public void testSkipFully_EOF() throws IOException {
    Reader reader = new StringReader("abcde");
    assertThrows(EOFException.class, () -> CharStreams.skipFully(reader, 6));
  }

  public void testSkipFully() throws IOException {
    String testString = "abcdef";

    assertEquals(2, CharStreams.readLines(r, conditional).intValue());
    assertEquals("ab", sb.toString());
  }

  public void testSkipFully_EOF() throws IOException {
    Reader reader = new StringReader("abcde");
    assertThrows(EOFException.class, () -> CharStreams.skipFully(reader, 6));
  }

  public void testSkipFully() throws IOException {
    String testString = "abcdef";

  }

  public void testConcat() throws IOException {
    CharSource c1 = CharSource.wrap("abc");
    CharSource c2 = CharSource.wrap("");
    CharSource c3 = CharSource.wrap("de");

    String expected = "abcde";

    assertEquals(expected, CharSource.concat(ImmutableList.of(c1, c2, c3)).read());
    assertEquals(expected, CharSource.concat(c1, c2, c3).read());

    assertEqualCharNodes(traverser.breadthFirst(charactersOf("bc")), "bcda");
  }

  @Test
  public void forGraph_breadthFirst_twoCycles() {
    Traverser<Character> traverser = Traverser.forGraph(TWO_CYCLES_GRAPH);
    assertEqualCharNodes(traverser.breadthFirst('a'), "abcd");
    assertEqualCharNodes(traverser.breadthFirst('b'), "bcda");
    assertEqualCharNodes(traverser.breadthFirst('c'), "cdab");

    assertEquals("", Strings.commonPrefix("abc", ""));
    assertEquals("", Strings.commonPrefix("", "abc"));
    assertEquals("", Strings.commonPrefix("abcde", "xyz"));
    assertEquals("", Strings.commonPrefix("xyz", "abcde"));
    assertEquals("", Strings.commonPrefix("xyz", "abcxyz"));
    assertEquals("a", Strings.commonPrefix("abc", "aaaaa"));
    assertEquals("aa", Strings.commonPrefix("aa", "aaaaa"));