### Question:
Chars { public static Slice truncateToLengthAndTrimSpaces(Slice slice, Type type) { requireNonNull(type, "type is null"); if (!(type instanceof CharType)) { throw new IllegalArgumentException("type must be the instance of CharType"); } return truncateToLengthAndTrimSpaces(slice, CharType.class.cast(type)); } private  Chars(); @Deprecated static boolean isCharType(Type type); static Slice padSpaces(Slice slice, CharType charType); static Slice padSpaces(Slice slice, int length); static String padSpaces(String value, CharType charType); static Slice truncateToLengthAndTrimSpaces(Slice slice, Type type); static Slice truncateToLengthAndTrimSpaces(Slice slice, CharType charType); static Slice truncateToLengthAndTrimSpaces(Slice slice, int maxLength); static Slice trimTrailingSpaces(Slice slice); static int byteCountWithoutTrailingSpace(Slice slice, int offset, int length); static int byteCountWithoutTrailingSpace(Slice slice, int offset, int length, int codePointCount); static int compareChars(Slice left, Slice right);  }### Answer:
@Test public void testTruncateToLengthAndTrimSpaces() { assertEquals(utf8Slice("a"), truncateToLengthAndTrimSpaces(utf8Slice("a c"), 1)); assertEquals(utf8Slice("a"), truncateToLengthAndTrimSpaces(utf8Slice("a "), 1)); assertEquals(utf8Slice("a"), truncateToLengthAndTrimSpaces(utf8Slice("abc"), 1)); assertEquals(utf8Slice(""), truncateToLengthAndTrimSpaces(utf8Slice("a c"), 0)); assertEquals(utf8Slice("a c"), truncateToLengthAndTrimSpaces(utf8Slice("a c "), 3)); assertEquals(utf8Slice("a c"), truncateToLengthAndTrimSpaces(utf8Slice("a c "), 4)); assertEquals(utf8Slice("a c"), truncateToLengthAndTrimSpaces(utf8Slice("a c "), 5)); assertEquals(utf8Slice("a c"), truncateToLengthAndTrimSpaces(utf8Slice("a c"), 3)); assertEquals(utf8Slice("a c"), truncateToLengthAndTrimSpaces(utf8Slice("a c"), 4)); assertEquals(utf8Slice("a c"), truncateToLengthAndTrimSpaces(utf8Slice("a c"), 5)); assertEquals(utf8Slice(""), truncateToLengthAndTrimSpaces(utf8Slice(" "), 1)); assertEquals(utf8Slice(""), truncateToLengthAndTrimSpaces(utf8Slice(""), 1)); }