testValidateWtf8Slice

fn testValidateWtf8Slice() !void {
    // These are valid/invalid under both UTF-8 and WTF-8 rules.
    try testing.expect(wtf8ValidateSlice("abc"));
    try testing.expect(wtf8ValidateSlice("abc\xdf\xbf"));
    try testing.expect(wtf8ValidateSlice(""));
    try testing.expect(wtf8ValidateSlice("a"));
    try testing.expect(wtf8ValidateSlice("abc"));
    try testing.expect(wtf8ValidateSlice("Ж"));
    try testing.expect(wtf8ValidateSlice("ЖЖ"));
    try testing.expect(wtf8ValidateSlice("брэд-ЛГТМ"));
    try testing.expect(wtf8ValidateSlice("☺☻☹"));
    try testing.expect(wtf8ValidateSlice("a\u{fffdb}"));
    try testing.expect(wtf8ValidateSlice("\xf4\x8f\xbf\xbf"));
    try testing.expect(wtf8ValidateSlice("abc\xdf\xbf"));

    try testing.expect(!wtf8ValidateSlice("abc\xc0"));
    try testing.expect(!wtf8ValidateSlice("abc\xc0abc"));
    try testing.expect(!wtf8ValidateSlice("aa\xe2"));
    try testing.expect(!wtf8ValidateSlice("\x42\xfa"));
    try testing.expect(!wtf8ValidateSlice("\x42\xfa\x43"));
    try testing.expect(!wtf8ValidateSlice("abc\xc0"));
    try testing.expect(!wtf8ValidateSlice("abc\xc0abc"));
    try testing.expect(!wtf8ValidateSlice("\xf4\x90\x80\x80"));
    try testing.expect(!wtf8ValidateSlice("\xf7\xbf\xbf\xbf"));
    try testing.expect(!wtf8ValidateSlice("\xfb\xbf\xbf\xbf\xbf"));
    try testing.expect(!wtf8ValidateSlice("\xc0\x80"));

    // But surrogate codepoints are only valid in WTF-8.
    try testing.expect(wtf8ValidateSlice("\xed\xa0\x80"));
    try testing.expect(wtf8ValidateSlice("\xed\xbf\xbf"));
}