final char c = text.charAt(i);
            if (c >= 'ａ' && c <= 'ｚ') {
                chars[i] = (char) (c - 'ａ' + 'a');
            } else if (c >= 'Ａ' && c <= 'Ｚ') {
                chars[i] = (char) (c - 'Ａ' + 'A');
            } else if (c >= '０' && c <= '９') {
                chars[i] = (char) (c - '０' + '0');
            } else {
                chars[i] = c;
            }
        }

            final char c = urlId.charAt(i);
            if (c >= 'a' && c <= 'z' //
                    || c >= 'A' && c <= 'Z' //
                    || c >= '0' && c <= '9' //
                    || c == '.' //
                    || c == '-' //
                    || c == '*' //
                    || c == '_' //
                    || c == ':' //
                    || c == '+' //
                    || c == '%' //

                || c == '=' || c == '&' || c == '?' || c == '#' //
                || c == '[' || c == ']' || c == '@' || c == '~' //
                || c == '!' || c == '$' || c == '\'' || c == '(' //
                || c == ')' || c == ',' || c == ';';
    }

        String result = StringUtil.join(delimiter, "A", "B", "C");
        assertEquals(expected, result);
    }

    private static Stream<Arguments> provideDelimiters() {
        return Stream.of(Arguments.of(",", "A,B,C"), Arguments.of(", ", "A, B, C"), Arguments.of(" ", "A B C"), Arguments.of("|", "A|B|C"),
                Arguments.of("::", "A::B::C"), Arguments.of("\n", "A\nB\nC"), Arguments.of("\r\n", "A\r\nB\r\nC"));
    }

        public boolean containsAll(final Collection<?> c) {
            return parent.containsAll(c);
        }

        @Override
        public boolean addAll(final Collection<? extends E> c) {
            return parent.addAll(c);
        }

        @Override
        public boolean addAll(final int index, final Collection<? extends E> c) {
            return parent.addAll(index, c);
        }

        @Override

                Name name;
                NbtAddress addr;
                char c = '.';

                ip = i = 0;
                for (; i < data.length && c == '.'; i++) {
                    int b = 0x00;

                    for (; i < data.length && (c = data[i]) >= 48 && c <= 57; i++) {
                        b = b * 10 + c - '0';
                    }
                    ip = (ip << 8) + b;
                }

        // Edge checks: ensure there are no negative or duplicate codes
        Set<Integer> seen = new HashSet<>();
        for (int c : WinError.WINERR_CODES) {
            assertTrue(c >= 0, "Code should be non-negative: " + c);
            assertTrue(seen.add(c), "Duplicate code detected: " + c);
        }
    }

    // Simple collaborator to demonstrate interaction verification with Mockito
    interface Handler {

    }

    /**
     * Creates a {@link CaseInsensitiveSet}.
     *
     * @param c the collection to copy from
     */
    public CaseInsensitiveSet(final Collection<String> c) {
        map = new CaseInsensitiveMap<>(Math.max((int) (c.size() / .75f) + 1, 16));
        addAll(c);
    }

    /**
     * Creates a {@link CaseInsensitiveSet}.
     *

        setTree(c, tree);

        // Act: first acquire triggers tree.acquire()
        c.acquire();
        verify(tree, times(1)).acquire();

        // Act: second acquire does not call tree.acquire again
        c.acquire();
        verify(tree, times(1)).acquire();

        // Act: first release does not release yet (usage -> 1)
        c.release();
        verify(tree, never()).release();

        assertContentType("text/x-csrc", "extractor/program/test.c", "test.c");
        assertContentType("text/x-c++src", "extractor/program/test.cpp", "test.cpp");
        assertContentType("text/x-chdr", "extractor/program/test.h", "test.h");
        assertContentType("text/x-c++hdr", "extractor/program/test.hpp", "test.hpp");