// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*   Copyright (C) 2010-2014, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  uts46test.cpp
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2010may05
*   created by: Markus W. Scherer
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_IDNA

#include <string.h>
#include "unicode/bytestream.h"
#include "unicode/idna.h"
#include "unicode/localpointer.h"
#include "unicode/std_string.h"
#include "unicode/stringpiece.h"
#include "unicode/uidna.h"
#include "unicode/unistr.h"
#include "charstr.h"
#include "cmemory.h"
#include "intltest.h"
#include "punycode.h"
#include "uparse.h"

class UTS46Test : public IntlTest {
public:
    UTS46Test() : trans(nullptr), nontrans(nullptr) {}
    virtual ~UTS46Test();

    void runIndexedTest(int32_t index, UBool exec, const char *&name, char *par=nullptr) override;
    void TestAPI();
    void TestNotSTD3();
    void TestInvalidPunycodeDigits();
    void TestACELabelEdgeCases();
    void TestDefaultNontransitional();
    void TestTooLong();
    void TestSomeCases();
    void IdnaTest();

    void checkIdnaTestResult(const char *line, const char *type,
                             const UnicodeString &expected, const UnicodeString &result,
                             const char *status, const IDNAInfo &info);
    void idnaTestOneLine(char *fields[][2], UErrorCode &errorCode);

private:
    IDNA *trans, *nontrans;
};

extern IntlTest *createUTS46Test() {
    return new UTS46Test();
}

UTS46Test::~UTS46Test() {
    delete trans;
    delete nontrans;
}

void UTS46Test::runIndexedTest(int32_t index, UBool exec, const char *&name, char * /*par*/) {
    if(exec) {
        logln("TestSuite UTS46Test: ");
        if(trans==nullptr) {
            IcuTestErrorCode errorCode(*this, "init/createUTS46Instance()");
            uint32_t commonOptions=
                UIDNA_USE_STD3_RULES|UIDNA_CHECK_BIDI|
                UIDNA_CHECK_CONTEXTJ|UIDNA_CHECK_CONTEXTO;
            trans=IDNA::createUTS46Instance(commonOptions, errorCode);
            nontrans=IDNA::createUTS46Instance(
                commonOptions|
                UIDNA_NONTRANSITIONAL_TO_ASCII|UIDNA_NONTRANSITIONAL_TO_UNICODE,
                errorCode);
            if(errorCode.errDataIfFailureAndReset("createUTS46Instance()")) {
                name="";
                return;
            }
        }
    }
    TESTCASE_AUTO_BEGIN;
    TESTCASE_AUTO(TestAPI);
    TESTCASE_AUTO(TestNotSTD3);
    TESTCASE_AUTO(TestInvalidPunycodeDigits);
    TESTCASE_AUTO(TestACELabelEdgeCases);
    TESTCASE_AUTO(TestDefaultNontransitional);
    TESTCASE_AUTO(TestTooLong);
    TESTCASE_AUTO(TestSomeCases);
    TESTCASE_AUTO(IdnaTest);
    TESTCASE_AUTO_END;
}

namespace {

const uint32_t severeErrors=
    UIDNA_ERROR_LEADING_COMBINING_MARK|
    UIDNA_ERROR_DISALLOWED|
    UIDNA_ERROR_PUNYCODE|
    UIDNA_ERROR_LABEL_HAS_DOT|
    UIDNA_ERROR_INVALID_ACE_LABEL;

UBool isASCII(const UnicodeString &str) {
    const char16_t *s=str.getBuffer();
    int32_t length=str.length();
    for(int32_t i=0; i<length; ++i) {
        if(s[i]>=0x80) {
            return false;
        }
    }
    return true;
}

class TestCheckedArrayByteSink : public CheckedArrayByteSink {
public:
    TestCheckedArrayByteSink(char* outbuf, int32_t capacity)
            : CheckedArrayByteSink(outbuf, capacity), calledFlush(false) {}
    virtual CheckedArrayByteSink& Reset() override {
        CheckedArrayByteSink::Reset();
        calledFlush = false;
        return *this;
    }
    virtual void Flush() override { calledFlush = true; }
    UBool calledFlush;
};

}  // namespace

void UTS46Test::TestAPI() {
    UErrorCode errorCode=U_ZERO_ERROR;
    UnicodeString result;
    IDNAInfo info;
    UnicodeString input=UNICODE_STRING_SIMPLE("www.eXample.cOm");
    UnicodeString expected=UNICODE_STRING_SIMPLE("www.example.com");
    trans->nameToASCII(input, result, info, errorCode);
    if(U_FAILURE(errorCode) || info.hasErrors() || result!=expected) {
        errln("T.nameToASCII(www.example.com) info.errors=%04lx result matches=%d %s",
              static_cast<long>(info.getErrors()), result == expected, u_errorName(errorCode));
    }
    errorCode=U_USELESS_COLLATOR_ERROR;
    trans->nameToUnicode(input, result, info, errorCode);
    if(errorCode!=U_USELESS_COLLATOR_ERROR || !result.isBogus()) {
        errln("T.nameToUnicode(U_FAILURE) did not preserve the errorCode "
              "or not result.setToBogus() - %s",
              u_errorName(errorCode));
    }
    errorCode=U_ZERO_ERROR;
    input.setToBogus();
    result=UNICODE_STRING_SIMPLE("quatsch");
    nontrans->labelToASCII(input, result, info, errorCode);
    if(errorCode!=U_ILLEGAL_ARGUMENT_ERROR || !result.isBogus()) {
        errln("N.labelToASCII(bogus) did not set illegal-argument-error "
              "or not result.setToBogus() - %s",
              u_errorName(errorCode));
    }
    errorCode=U_ZERO_ERROR;
    input=UNICODE_STRING_SIMPLE("xn--bcher.de-65a");
    expected=UNICODE_STRING_SIMPLE("xn--bcher\\uFFFDde-65a").unescape();
    nontrans->labelToASCII(input, result, info, errorCode);
    if( U_FAILURE(errorCode) ||
        info.getErrors()!=(UIDNA_ERROR_LABEL_HAS_DOT|UIDNA_ERROR_INVALID_ACE_LABEL) ||
        result!=expected
    ) {
        errln("N.labelToASCII(label-with-dot) failed with errors %04lx - %s",
              info.getErrors(), u_errorName(errorCode));
    }
    // UTF-8
    char buffer[100];
    TestCheckedArrayByteSink sink(buffer, UPRV_LENGTHOF(buffer));
    errorCode=U_ZERO_ERROR;
    nontrans->labelToUnicodeUTF8(StringPiece((const char *)nullptr, 5), sink, info, errorCode);
    if(errorCode!=U_ILLEGAL_ARGUMENT_ERROR || sink.NumberOfBytesWritten()!=0) {
        errln("N.labelToUnicodeUTF8(StringPiece(nullptr, 5)) did not set illegal-argument-error ",
              "or did output something - %s",
              u_errorName(errorCode));
    }

    sink.Reset();
    errorCode=U_ZERO_ERROR;
    nontrans->nameToASCII_UTF8(StringPiece(), sink, info, errorCode);
    if(U_FAILURE(errorCode) || sink.NumberOfBytesWritten()!=0 || !sink.calledFlush) {
        errln("N.nameToASCII_UTF8(empty) failed - %s",
              u_errorName(errorCode));
    }

    static const char s[] = { 0x61, static_cast<char>(0xc3), static_cast<char>(0x9f) };
    sink.Reset();
    errorCode=U_USELESS_COLLATOR_ERROR;
    nontrans->nameToUnicodeUTF8(StringPiece(s, 3), sink, info, errorCode);
    if(errorCode!=U_USELESS_COLLATOR_ERROR || sink.NumberOfBytesWritten()!=0) {
        errln("N.nameToUnicode_UTF8(U_FAILURE) did not preserve the errorCode "
              "or did output something - %s",
              u_errorName(errorCode));
    }

    sink.Reset();
    errorCode=U_ZERO_ERROR;
    trans->labelToUnicodeUTF8(StringPiece(s, 3), sink, info, errorCode);
    if( U_FAILURE(errorCode) || sink.NumberOfBytesWritten()!=3 ||
        buffer[0]!=0x61 || buffer[1]!=0x73 || buffer[2]!=0x73 ||
        !sink.calledFlush
    ) {
        errln("T.labelToUnicodeUTF8(a sharp-s) failed - %s",
              u_errorName(errorCode));
    }

    sink.Reset();
    errorCode=U_ZERO_ERROR;
    // "eXampLe.cOm"
    static const char eX[]={ 0x65, 0x58, 0x61, 0x6d, 0x70, 0x4c, 0x65, 0x2e, 0x63, 0x4f, 0x6d, 0 };
    // "example.com"
    static const char ex[]={ 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d };
    trans->nameToUnicodeUTF8(eX, sink, info, errorCode);
    if( U_FAILURE(errorCode) || sink.NumberOfBytesWritten()!=11 ||
        0!=memcmp(ex, buffer, 11) || !sink.calledFlush
    ) {
        errln("T.nameToUnicodeUTF8(eXampLe.cOm) failed - %s",
              u_errorName(errorCode));
    }
}

void UTS46Test::TestNotSTD3() {
    IcuTestErrorCode errorCode(*this, "TestNotSTD3()");
    char buffer[400];
    LocalPointer<IDNA> not3(IDNA::createUTS46Instance(UIDNA_CHECK_BIDI, errorCode));
    if(errorCode.isFailure()) {
        return;
    }
    UnicodeString input=UNICODE_STRING_SIMPLE("\\u0000A_2+2=4\\u000A.e\\u00DFen.net").unescape();
    UnicodeString result;
    IDNAInfo info;
    if( not3->nameToUnicode(input, result, info, errorCode)!=
            UNICODE_STRING_SIMPLE("\\u0000a_2+2=4\\u000A.essen.net").unescape() ||
        info.hasErrors()
    ) {
        prettify(result).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
        errln("notSTD3.nameToUnicode(non-LDH ASCII) unexpected errors %04lx string %s",
              static_cast<long>(info.getErrors()), buffer);
    }
    // A space (BiDi class WS) is not allowed in a BiDi domain name.
    input=UNICODE_STRING_SIMPLE("a z.xn--4db.edu");
    not3->nameToASCII(input, result, info, errorCode);
    if(result!=input || info.getErrors()!=UIDNA_ERROR_BIDI) {
        errln("notSTD3.nameToASCII(ASCII-with-space.alef.edu) failed");
    }
}

void UTS46Test::TestInvalidPunycodeDigits() {
    IcuTestErrorCode errorCode(*this, "TestInvalidPunycodeDigits()");
    LocalPointer<IDNA> idna(IDNA::createUTS46Instance(0, errorCode));
    if(errorCode.isFailure()) {
        return;
    }
    UnicodeString result;
    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--pleP", result, info, errorCode);  // P=U+0050
        assertFalse("nameToUnicode() should succeed",
                    (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
        assertEquals("normal result", u"ᔼᔴ", result);
    }
    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--pleѐ", result, info, errorCode);  // ends with non-ASCII U+0450
        assertTrue("nameToUnicode() should detect non-ASCII",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    // Test with ASCII characters adjacent to LDH.
    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--ple/", result, info, errorCode);
        assertTrue("nameToUnicode() should detect '/'",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--ple:", result, info, errorCode);
        assertTrue("nameToUnicode() should detect ':'",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--ple@", result, info, errorCode);
        assertTrue("nameToUnicode() should detect '@'",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--ple[", result, info, errorCode);
        assertTrue("nameToUnicode() should detect '['",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--ple`", result, info, errorCode);
        assertTrue("nameToUnicode() should detect '`'",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    {
        IDNAInfo info;
        idna->nameToUnicode(u"xn--ple{", result, info, errorCode);
        assertTrue("nameToUnicode() should detect '{'",
                   (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }
}

void UTS46Test::TestACELabelEdgeCases() {
    // In IDNA2008, these labels fail the round-trip validation from comparing
    // the ToUnicode input with the back-to-ToASCII output.
    IcuTestErrorCode errorCode(*this, "TestACELabelEdgeCases()");
    LocalPointer<IDNA> idna(IDNA::createUTS46Instance(0, errorCode));
    if(errorCode.isFailure()) {
        return;
    }
    UnicodeString result;
    {
        IDNAInfo info;
        idna->labelToUnicode(u"xn--", result, info, errorCode);
        assertTrue("empty xn--", (info.getErrors()&UIDNA_ERROR_INVALID_ACE_LABEL)!=0);
    }
    {
        IDNAInfo info;
        idna->labelToUnicode(u"xN--ASCII-", result, info, errorCode);
        assertTrue("nothing but ASCII", (info.getErrors()&UIDNA_ERROR_INVALID_ACE_LABEL)!=0);
    }
    {
        // Different error: The Punycode decoding procedure does not consume the last delimiter
        // if it is right after the xn-- so the main decoding loop fails because the hyphen
        // is not a valid Punycode digit.
        IDNAInfo info;
        idna->labelToUnicode(u"Xn---", result, info, errorCode);
        assertTrue("empty Xn---", (info.getErrors()&UIDNA_ERROR_PUNYCODE)!=0);
    }

    {
        // Unicode 15.1 UTS #46:
        // Added an additional condition in 4.1 Validity Criteria to
        // disallow labels such as xn--xn---epa., which do not round-trip.
        // --> Validity Criteria new criterion 4:
        // If not CheckHyphens, the label must not begin with “xn--”.
        IDNAInfo info;
        idna->labelToUnicode("xn--xn---epa", result, info, errorCode);
        assertTrue("error for xn--xn---epa",
                (info.getErrors()&UIDNA_ERROR_INVALID_ACE_LABEL)!=0);
    }
}

void UTS46Test::TestDefaultNontransitional() {
    IcuTestErrorCode errorCode(*this, "TestDefaultNontransitional()");
    // Unicode 15.1 UTS #46 deprecated transitional processing.
    // ICU 76 changed UIDNA_DEFAULT to set the nontransitional options.
    LocalPointer<IDNA> forZero(IDNA::createUTS46Instance(0, errorCode));
    LocalPointer<IDNA> forDefault(IDNA::createUTS46Instance(UIDNA_DEFAULT, errorCode));
    if(errorCode.isFailure()) {
        return;
    }
    UnicodeString result;
    IDNAInfo info;
    forZero->labelToUnicode(u"Fⓤßẞ", result, info, errorCode);
    assertEquals("forZero.toUnicode(Fⓤßẞ)", u"fussss", result);
    forZero->labelToASCII(u"Fⓤßẞ", result, info, errorCode);
    assertEquals("forZero.toASCII(Fⓤßẞ)", u"fussss", result);
    forDefault->labelToUnicode(u"Fⓤßẞ", result, info, errorCode);
    assertEquals("forDefault.toUnicode(Fⓤßẞ)", u"fußß", result);
    forDefault->labelToASCII(u"Fⓤßẞ", result, info, errorCode);
    assertEquals("forDefault.toASCII(Fⓤßẞ)", u"xn--fu-hiaa", result);
}

void UTS46Test::TestTooLong() {
    // ICU-13727: Limit input length for n^2 algorithm
    // where well-formed strings are at most 59 characters long.
    int32_t count = 50000;
    UnicodeString s(count, u'a', count);  // capacity, code point, count
    char16_t dest[60000];
    UErrorCode errorCode = U_ZERO_ERROR;
    u_strToPunycode(s.getBuffer(), s.length(), dest, UPRV_LENGTHOF(dest), nullptr, &errorCode);
    assertEquals("encode: expected an error for too-long input", U_INPUT_TOO_LONG_ERROR, errorCode);
    errorCode = U_ZERO_ERROR;
    u_strFromPunycode(s.getBuffer(), s.length(), dest, UPRV_LENGTHOF(dest), nullptr, &errorCode);
    assertEquals("decode: expected an error for too-long input", U_INPUT_TOO_LONG_ERROR, errorCode);
}

namespace {

struct TestCase {
    // Input string and options string (Nontransitional/Transitional/Both).
    const char *s, *o;
    // Expected Unicode result string.
    const char *u;
    uint32_t errors;
};

const TestCase testCases[] = {
    { "www.eXample.cOm", "B",  // all ASCII
      "www.example.com", 0 },
    { "B\\u00FCcher.de", "B",  // u-umlaut
      "b\\u00FCcher.de", 0 },
    { "\\u00D6BB", "B",  // O-umlaut
      "\\u00F6bb", 0 },
    { "fa\\u00DF.de", "N",  // sharp s
      "fa\\u00DF.de", 0 },
    { "fa\\u00DF.de", "T",  // sharp s
      "fass.de", 0 },
    { "XN--fA-hia.dE", "B",  // sharp s in Punycode
      "fa\\u00DF.de", 0 },
    { "\\u03B2\\u03CC\\u03BB\\u03BF\\u03C2.com", "N",  // Greek with final sigma
      "\\u03B2\\u03CC\\u03BB\\u03BF\\u03C2.com", 0 },
    { "\\u03B2\\u03CC\\u03BB\\u03BF\\u03C2.com", "T",  // Greek with final sigma
      "\\u03B2\\u03CC\\u03BB\\u03BF\\u03C3.com", 0 },
    { "xn--nxasmm1c", "B",  // Greek with final sigma in Punycode
      "\\u03B2\\u03CC\\u03BB\\u03BF\\u03C2", 0 },
    { "www.\\u0DC1\\u0DCA\\u200D\\u0DBB\\u0DD3.com", "N",  // "Sri" in "Sri Lanka" has a ZWJ
      "www.\\u0DC1\\u0DCA\\u200D\\u0DBB\\u0DD3.com", 0 },
    { "www.\\u0DC1\\u0DCA\\u200D\\u0DBB\\u0DD3.com", "T",  // "Sri" in "Sri Lanka" has a ZWJ
      "www.\\u0DC1\\u0DCA\\u0DBB\\u0DD3.com", 0 },
    { "www.xn--10cl1a0b660p.com", "B",  // "Sri" in Punycode
      "www.\\u0DC1\\u0DCA\\u200D\\u0DBB\\u0DD3.com", 0 },
    { "\\u0646\\u0627\\u0645\\u0647\\u200C\\u0627\\u06CC", "N",  // ZWNJ
      "\\u0646\\u0627\\u0645\\u0647\\u200C\\u0627\\u06CC", 0 },
    { "\\u0646\\u0627\\u0645\\u0647\\u200C\\u0627\\u06CC", "T",  // ZWNJ
      "\\u0646\\u0627\\u0645\\u0647\\u0627\\u06CC", 0 },
    { "xn--mgba3gch31f060k.com", "B",  // ZWNJ in Punycode
      "\\u0646\\u0627\\u0645\\u0647\\u200C\\u0627\\u06CC.com", 0 },
    { "a.b\\uFF0Ec\\u3002d\\uFF61", "B",
      "a.b.c.d.", 0 },
    { "U\\u0308.xn--tda", "B",  // U+umlaut.u-umlaut
      "\\u00FC.\\u00FC", 0 },
    { "xn--u-ccb", "B",  // u+umlaut in Punycode
      "xn--u-ccb\\uFFFD", UIDNA_ERROR_INVALID_ACE_LABEL },
    { "a\\u2488com", "B",  // contains 1-dot
      "a\\uFFFDcom", UIDNA_ERROR_DISALLOWED },
    { "xn--a-ecp.ru", "B",  // contains 1-dot in Punycode
      "xn--a-ecp\\uFFFD.ru", UIDNA_ERROR_INVALID_ACE_LABEL },
    { "xn--0.pt", "B",  // invalid Punycode
      "xn--0\\uFFFD.pt", UIDNA_ERROR_PUNYCODE },
    { "xn--a.pt", "B",  // U+0080
      "xn--a\\uFFFD.pt", UIDNA_ERROR_INVALID_ACE_LABEL },
    { "xn--a-\\u00C4.pt", "B",  // invalid Punycode
      "xn--a-\\u00E4.pt", UIDNA_ERROR_PUNYCODE },
    { "\\u65E5\\u672C\\u8A9E\\u3002\\uFF2A\\uFF30", "B",  // Japanese with fullwidth ".jp"
      "\\u65E5\\u672C\\u8A9E.jp", 0 },
    { "\\u2615", "B", "\\u2615", 0 },  // Unicode 4.0 HOT BEVERAGE
    // many deviation characters, test the special mapping code
    { "1.a\\u00DF\\u200C\\u200Db\\u200C\\u200Dc\\u00DF\\u00DF\\u00DF\\u00DFd"
      "\\u03C2\\u03C3\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFe"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFx"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFy"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u0302\\u00DFz", "N",
      "1.a\\u00DF\\u200C\\u200Db\\u200C\\u200Dc\\u00DF\\u00DF\\u00DF\\u00DFd"
      "\\u03C2\\u03C3\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFe"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFx"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFy"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u0302\\u00DFz",
      UIDNA_ERROR_LABEL_TOO_LONG|UIDNA_ERROR_CONTEXTJ },
    { "1.a\\u00DF\\u200C\\u200Db\\u200C\\u200Dc\\u00DF\\u00DF\\u00DF\\u00DFd"
      "\\u03C2\\u03C3\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFe"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFx"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DFy"
      "\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u00DF\\u0302\\u00DFz", "T",
      "1.assbcssssssssd"
      "\\u03C3\\u03C3sssssssssssssssse"
      "ssssssssssssssssssssx"
      "ssssssssssssssssssssy"
      "sssssssssssssss\\u015Dssz", UIDNA_ERROR_LABEL_TOO_LONG },
    // "xn--bss" with deviation characters
    { "\\u200Cx\\u200Dn\\u200C-\\u200D-b\\u00DF", "N",
      "\\u200Cx\\u200Dn\\u200C-\\u200D-b\\u00DF", UIDNA_ERROR_CONTEXTJ },
    { "\\u200Cx\\u200Dn\\u200C-\\u200D-b\\u00DF", "T",
      "\\u5919", 0 },
    // "xn--bssffl" written as:
    // 02E3 MODIFIER LETTER SMALL X
    // 034F COMBINING GRAPHEME JOINER (ignored)
    // 2115 DOUBLE-STRUCK CAPITAL N
    // 200B ZERO WIDTH SPACE (ignored)
    // FE63 SMALL HYPHEN-MINUS
    // 00AD SOFT HYPHEN (ignored)
    // FF0D FULLWIDTH HYPHEN-MINUS
    // 180C MONGOLIAN FREE VARIATION SELECTOR TWO (ignored)
    // 212C SCRIPT CAPITAL B
    // FE00 VARIATION SELECTOR-1 (ignored)
    // 017F LATIN SMALL LETTER LONG S
    // 2064 INVISIBLE PLUS (ignored)
    // 1D530 MATHEMATICAL FRAKTUR SMALL S
    // E01EF VARIATION SELECTOR-256 (ignored)
    // FB04 LATIN SMALL LIGATURE FFL
    { "\\u02E3\\u034F\\u2115\\u200B\\uFE63\\u00AD\\uFF0D\\u180C"
      "\\u212C\\uFE00\\u017F\\u2064\\U0001D530\\U000E01EF\\uFB04", "B",
      "\\u5921\\u591E\\u591C\\u5919", 0 },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901", 0 },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901.", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901.", 0 },
    // Domain name >256 characters, forces slow path in UTF-8 processing.
    { "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "12345678901234567890123456789012345678901234567890123456789012", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "12345678901234567890123456789012345678901234567890123456789012",
      UIDNA_ERROR_DOMAIN_NAME_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789\\u05D0", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789\\u05D0",
      UIDNA_ERROR_DOMAIN_NAME_TOO_LONG|UIDNA_ERROR_BIDI },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901234."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901234."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890",
      UIDNA_ERROR_LABEL_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901234."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890.", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901234."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890.",
      UIDNA_ERROR_LABEL_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901234."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901234."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901",
      UIDNA_ERROR_LABEL_TOO_LONG|UIDNA_ERROR_DOMAIN_NAME_TOO_LONG },
    // label length 63: xn--1234567890123456789012345678901234567890123456789012345-9te
    { "\\u00E41234567890123456789012345678901234567890123456789012345", "B",
      "\\u00E41234567890123456789012345678901234567890123456789012345", 0 },
    { "1234567890\\u00E41234567890123456789012345678901234567890123456", "B",
      "1234567890\\u00E41234567890123456789012345678901234567890123456", UIDNA_ERROR_LABEL_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E4123456789012345678901234567890123456789012345."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E4123456789012345678901234567890123456789012345."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901", 0 },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E4123456789012345678901234567890123456789012345."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901.", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E4123456789012345678901234567890123456789012345."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901.", 0 },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E4123456789012345678901234567890123456789012345."
      "123456789012345678901234567890123456789012345678901234567890123."
      "12345678901234567890123456789012345678901234567890123456789012", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E4123456789012345678901234567890123456789012345."
      "123456789012345678901234567890123456789012345678901234567890123."
      "12345678901234567890123456789012345678901234567890123456789012",
      UIDNA_ERROR_DOMAIN_NAME_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E41234567890123456789012345678901234567890123456."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E41234567890123456789012345678901234567890123456."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890",
      UIDNA_ERROR_LABEL_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E41234567890123456789012345678901234567890123456."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890.", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E41234567890123456789012345678901234567890123456."
      "123456789012345678901234567890123456789012345678901234567890123."
      "123456789012345678901234567890123456789012345678901234567890.",
      UIDNA_ERROR_LABEL_TOO_LONG },
    { "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E41234567890123456789012345678901234567890123456."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901", "B",
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890\\u00E41234567890123456789012345678901234567890123456."
      "123456789012345678901234567890123456789012345678901234567890123."
      "1234567890123456789012345678901234567890123456789012345678901",
      UIDNA_ERROR_LABEL_TOO_LONG|UIDNA_ERROR_DOMAIN_NAME_TOO_LONG },
    // hyphen errors and empty-label errors
    // Ticket #10883: ToUnicode also checks for empty labels.
    { ".", "B", ".", UIDNA_ERROR_EMPTY_LABEL },
    { "\\uFF0E", "B", ".", UIDNA_ERROR_EMPTY_LABEL },
    // "xn---q----jra"=="-q--a-umlaut-"
    { "a.b..-q--a-.e", "B", "a.b..-q--a-.e",
      UIDNA_ERROR_EMPTY_LABEL|UIDNA_ERROR_LEADING_HYPHEN|UIDNA_ERROR_TRAILING_HYPHEN|
      UIDNA_ERROR_HYPHEN_3_4 },
    { "a.b..-q--\\u00E4-.e", "B", "a.b..-q--\\u00E4-.e",
      UIDNA_ERROR_EMPTY_LABEL|UIDNA_ERROR_LEADING_HYPHEN|UIDNA_ERROR_TRAILING_HYPHEN|
      UIDNA_ERROR_HYPHEN_3_4 },
    { "a.b..xn---q----jra.e", "B", "a.b..-q--\\u00E4-.e",
      UIDNA_ERROR_EMPTY_LABEL|UIDNA_ERROR_LEADING_HYPHEN|UIDNA_ERROR_TRAILING_HYPHEN|
      UIDNA_ERROR_HYPHEN_3_4 },
    { "a..c", "B", "a..c", UIDNA_ERROR_EMPTY_LABEL },
    { "a.xn--.c", "B", "a.xn--\\uFFFD.c", UIDNA_ERROR_INVALID_ACE_LABEL },
    { "a.-b.", "B", "a.-b.", UIDNA_ERROR_LEADING_HYPHEN },
    { "a.b-.c", "B", "a.b-.c", UIDNA_ERROR_TRAILING_HYPHEN },
    { "a.-.c", "B", "a.-.c", UIDNA_ERROR_LEADING_HYPHEN|UIDNA_ERROR_TRAILING_HYPHEN },
    { "a.bc--de.f", "B", "a.bc--de.f", UIDNA_ERROR_HYPHEN_3_4 },
    { "\\u00E4.\\u00AD.c", "B", "\\u00E4..c", UIDNA_ERROR_EMPTY_LABEL },
    { "\\u00E4.xn--.c", "B", "\\u00E4.xn--\\uFFFD.c", UIDNA_ERROR_INVALID_ACE_LABEL },
    { "\\u00E4.-b.", "B", "\\u00E4.-b.", UIDNA_ERROR_LEADING_HYPHEN },
    { "\\u00E4.b-.c", "B", "\\u00E4.b-.c", UIDNA_ERROR_TRAILING_HYPHEN },
    { "\\u00E4.-.c", "B", "\\u00E4.-.c", UIDNA_ERROR_LEADING_HYPHEN|UIDNA_ERROR_TRAILING_HYPHEN },
    { "\\u00E4.bc--de.f", "B", "\\u00E4.bc--de.f", UIDNA_ERROR_HYPHEN_3_4 },
    { "a.b.\\u0308c.d", "B", "a.b.\\uFFFDc.d", UIDNA_ERROR_LEADING_COMBINING_MARK },
    { "a.b.xn--c-bcb.d", "B",
      "a.b.xn--c-bcb\\uFFFD.d", UIDNA_ERROR_LEADING_COMBINING_MARK|UIDNA_ERROR_INVALID_ACE_LABEL },
    // BiDi
    { "A0", "B", "a0", 0 },
    { "0A", "B", "0a", 0 },  // all-LTR is ok to start with a digit (EN)
    { "0A.\\u05D0", "B",  // ASCII label does not start with L/R/AL
      "0a.\\u05D0", UIDNA_ERROR_BIDI },
    { "c.xn--0-eha.xn--4db", "B",  // 2nd label does not start with L/R/AL
      "c.0\\u00FC.\\u05D0", UIDNA_ERROR_BIDI },
    { "b-.\\u05D0", "B",  // label does not end with L/EN
      "b-.\\u05D0", UIDNA_ERROR_TRAILING_HYPHEN|UIDNA_ERROR_BIDI },
    { "d.xn----dha.xn--4db", "B",  // 2nd label does not end with L/EN
      "d.\\u00FC-.\\u05D0", UIDNA_ERROR_TRAILING_HYPHEN|UIDNA_ERROR_BIDI },
    { "a\\u05D0", "B", "a\\u05D0", UIDNA_ERROR_BIDI },  // first dir != last dir
    { "\\u05D0\\u05C7", "B", "\\u05D0\\u05C7", 0 },
    { "\\u05D09\\u05C7", "B", "\\u05D09\\u05C7", 0 },
    { "\\u05D0a\\u05C7", "B", "\\u05D0a\\u05C7", UIDNA_ERROR_BIDI },  // first dir != last dir
    { "\\u05D0\\u05EA", "B", "\\u05D0\\u05EA", 0 },
    { "\\u05D0\\u05F3\\u05EA", "B", "\\u05D0\\u05F3\\u05EA", 0 },
    { "a\\u05D0Tz", "B", "a\\u05D0tz", UIDNA_ERROR_BIDI },  // mixed dir
    { "\\u05D0T\\u05EA", "B", "\\u05D0t\\u05EA", UIDNA_ERROR_BIDI },  // mixed dir
    { "\\u05D07\\u05EA", "B", "\\u05D07\\u05EA", 0 },
    { "\\u05D0\\u0667\\u05EA", "B", "\\u05D0\\u0667\\u05EA", 0 },  // Arabic 7 in the middle
    { "a7\\u0667z", "B", "a7\\u0667z", UIDNA_ERROR_BIDI },  // AN digit in LTR
    { "a7\\u0667", "B", "a7\\u0667", UIDNA_ERROR_BIDI },  // AN digit in LTR
    { "\\u05D07\\u0667\\u05EA", "B",  // mixed EN/AN digits in RTL
      "\\u05D07\\u0667\\u05EA", UIDNA_ERROR_BIDI },
    { "\\u05D07\\u0667", "B",  // mixed EN/AN digits in RTL
      "\\u05D07\\u0667", UIDNA_ERROR_BIDI },
    // ZWJ
    { "\\u0BB9\\u0BCD\\u200D", "N", "\\u0BB9\\u0BCD\\u200D", 0 },  // Virama+ZWJ
    { "\\u0BB9\\u200D", "N", "\\u0BB9\\u200D", UIDNA_ERROR_CONTEXTJ },  // no Virama
    { "\\u200D", "N", "\\u200D", UIDNA_ERROR_CONTEXTJ },  // no Virama
    // ZWNJ
    { "\\u0BB9\\u0BCD\\u200C", "N", "\\u0BB9\\u0BCD\\u200C", 0 },  // Virama+ZWNJ
    { "\\u0BB9\\u200C", "N", "\\u0BB9\\u200C", UIDNA_ERROR_CONTEXTJ },  // no Virama
    { "\\u200C", "N", "\\u200C", UIDNA_ERROR_CONTEXTJ },  // no Virama
    { "\\u0644\\u0670\\u200C\\u06ED\\u06EF", "N",  // Joining types D T ZWNJ T R
      "\\u0644\\u0670\\u200C\\u06ED\\u06EF", 0 },
    { "\\u0644\\u0670\\u200C\\u06EF", "N",  // D T ZWNJ R
      "\\u0644\\u0670\\u200C\\u06EF", 0 },
    { "\\u0644\\u200C\\u06ED\\u06EF", "N",  // D ZWNJ T R
      "\\u0644\\u200C\\u06ED\\u06EF", 0 },
    { "\\u0644\\u200C\\u06EF", "N",  // D ZWNJ R
      "\\u0644\\u200C\\u06EF", 0 },
    { "\\u0644\\u0670\\u200C\\u06ED", "N",  // D T ZWNJ T
      "\\u0644\\u0670\\u200C\\u06ED", UIDNA_ERROR_BIDI|UIDNA_ERROR_CONTEXTJ },
    { "\\u06EF\\u200C\\u06EF", "N",  // R ZWNJ R
      "\\u06EF\\u200C\\u06EF", UIDNA_ERROR_CONTEXTJ },
    { "\\u0644\\u200C", "N",  // D ZWNJ
      "\\u0644\\u200C", UIDNA_ERROR_BIDI|UIDNA_ERROR_CONTEXTJ },
    { "\\u0660\\u0661", "B",  // Arabic-Indic Digits alone
      "\\u0660\\u0661", UIDNA_ERROR_BIDI },
    { "\\u06F0\\u06F1", "B",  // Extended Arabic-Indic Digits alone
      "\\u06F0\\u06F1", 0 },
    { "\\u0660\\u06F1", "B",  // Mixed Arabic-Indic Digits
      "\\u0660\\u06F1", UIDNA_ERROR_CONTEXTO_DIGITS|UIDNA_ERROR_BIDI },
    // All of the CONTEXTO "Would otherwise have been DISALLOWED" characters
    // in their correct contexts,
    // then each in incorrect context.
    { "l\\u00B7l\\u4E00\\u0375\\u03B1\\u05D0\\u05F3\\u05F4\\u30FB", "B",
      "l\\u00B7l\\u4E00\\u0375\\u03B1\\u05D0\\u05F3\\u05F4\\u30FB", UIDNA_ERROR_BIDI },
    { "l\\u00B7", "B",
      "l\\u00B7", UIDNA_ERROR_CONTEXTO_PUNCTUATION },
    { "\\u00B7l", "B",
      "\\u00B7l", UIDNA_ERROR_CONTEXTO_PUNCTUATION },
    { "\\u0375", "B",
      "\\u0375", UIDNA_ERROR_CONTEXTO_PUNCTUATION },
    { "\\u03B1\\u05F3", "B",
      "\\u03B1\\u05F3", UIDNA_ERROR_CONTEXTO_PUNCTUATION|UIDNA_ERROR_BIDI },
    { "\\u05F4", "B",
      "\\u05F4", UIDNA_ERROR_CONTEXTO_PUNCTUATION },
    { "l\\u30FB", "B",
      "l\\u30FB", UIDNA_ERROR_CONTEXTO_PUNCTUATION },
    // Ticket #8137: UTS #46 toUnicode() fails with non-ASCII labels that turn
    // into 15 characters (UChars).
    // The bug was in u_strFromPunycode() which did not write the last character
    // if it just so fit into the end of the destination buffer.
    // The UTS #46 code gives a default-capacity UnicodeString as the destination buffer,
    // and the internal UnicodeString capacity is currently 15 UChars on 64-bit machines
    // but 13 on 32-bit machines.
    // Label with 15 UChars, for 64-bit-machine testing:
    { "aaaaaaaaaaaaa\\u00FCa.de", "B", "aaaaaaaaaaaaa\\u00FCa.de", 0 },
    { "xn--aaaaaaaaaaaaaa-ssb.de", "B", "aaaaaaaaaaaaa\\u00FCa.de", 0 },
    { "abschlu\\u00DFpr\\u00FCfung.de", "N", "abschlu\\u00DFpr\\u00FCfung.de", 0 },
    { "xn--abschluprfung-hdb15b.de", "B", "abschlu\\u00DFpr\\u00FCfung.de", 0 },
    // Label with 13 UChars, for 32-bit-machine testing:
    { "xn--aaaaaaaaaaaa-nlb.de", "B", "aaaaaaaaaaa\\u00FCa.de", 0 },
    { "xn--schluprfung-z6a39a.de", "B", "schlu\\u00DFpr\\u00FCfung.de", 0 },
    // { "", "B",
    //   "", 0 },
};

}  // namespace

void UTS46Test::TestSomeCases() {
    IcuTestErrorCode errorCode(*this, "TestSomeCases");
    char buffer[400], buffer2[400];
    int32_t i;
    for(i=0; i<UPRV_LENGTHOF(testCases); ++i) {
        const TestCase &testCase=testCases[i];
        UnicodeString input(ctou(testCase.s));
        UnicodeString expected(ctou(testCase.u));
        // ToASCII/ToUnicode, transitional/nontransitional
        UnicodeString aT, uT, aN, uN;
        IDNAInfo aTInfo, uTInfo, aNInfo, uNInfo;
        trans->nameToASCII(input, aT, aTInfo, errorCode);
        trans->nameToUnicode(input, uT, uTInfo, errorCode);
        nontrans->nameToASCII(input, aN, aNInfo, errorCode);
        nontrans->nameToUnicode(input, uN, uNInfo, errorCode);
        if(errorCode.errIfFailureAndReset("first-level processing [%d/%s] %s",
                                          static_cast<int>(i), testCase.o, testCase.s)
        ) {
            continue;
        }
        // ToUnicode does not set length-overflow errors.
        uint32_t uniErrors=testCase.errors&~
            (UIDNA_ERROR_LABEL_TOO_LONG|
             UIDNA_ERROR_DOMAIN_NAME_TOO_LONG);
        char mode=testCase.o[0];
        if(mode=='B' || mode=='N') {
            if(uNInfo.getErrors()!=uniErrors) {
                errln("N.nameToUnicode([%d] %s) unexpected errors %04lx",
                      static_cast<int>(i), testCase.s, static_cast<long>(uNInfo.getErrors()));
                continue;
            }
            if(uN!=expected) {
                prettify(uN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                errln("N.nameToUnicode([%d] %s) unexpected string %s",
                      static_cast<int>(i), testCase.s, buffer);
                continue;
            }
            if(aNInfo.getErrors()!=testCase.errors) {
                errln("N.nameToASCII([%d] %s) unexpected errors %04lx",
                      static_cast<int>(i), testCase.s, static_cast<long>(aNInfo.getErrors()));
                continue;
            }
        }
        if(mode=='B' || mode=='T') {
            if(uTInfo.getErrors()!=uniErrors) {
                errln("T.nameToUnicode([%d] %s) unexpected errors %04lx",
                      static_cast<int>(i), testCase.s, static_cast<long>(uTInfo.getErrors()));
                continue;
            }
            if(uT!=expected) {
                prettify(uT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                errln("T.nameToUnicode([%d] %s) unexpected string %s",
                      static_cast<int>(i), testCase.s, buffer);
                continue;
            }
            if(aTInfo.getErrors()!=testCase.errors) {
                errln("T.nameToASCII([%d] %s) unexpected errors %04lx",
                      static_cast<int>(i), testCase.s, static_cast<long>(aTInfo.getErrors()));
                continue;
            }
        }
        // ToASCII is all-ASCII if no severe errors
        if((aNInfo.getErrors()&severeErrors)==0 && !isASCII(aN)) {
            prettify(aN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            errln("N.nameToASCII([%d] %s) (errors %04lx) result is not ASCII %s",
                  static_cast<int>(i), testCase.s, aNInfo.getErrors(), buffer);
            continue;
        }
        if((aTInfo.getErrors()&severeErrors)==0 && !isASCII(aT)) {
            prettify(aT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            errln("T.nameToASCII([%d] %s) (errors %04lx) result is not ASCII %s",
                  static_cast<int>(i), testCase.s, aTInfo.getErrors(), buffer);
            continue;
        }
        if(verbose) {
            char m= mode=='B' ? mode : 'N';
            prettify(aN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            logln("%c.nameToASCII([%d] %s) (errors %04lx) result string: %s",
                  m, static_cast<int>(i), testCase.s, aNInfo.getErrors(), buffer);
            if(mode!='B') {
                prettify(aT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                logln("T.nameToASCII([%d] %s) (errors %04lx) result string: %s",
                      static_cast<int>(i), testCase.s, aTInfo.getErrors(), buffer);
            }
        }
        // second-level processing
        UnicodeString aTuN, uTaN, aNuN, uNaN;
        IDNAInfo aTuNInfo, uTaNInfo, aNuNInfo, uNaNInfo;
        nontrans->nameToUnicode(aT, aTuN, aTuNInfo, errorCode);
        nontrans->nameToASCII(uT, uTaN, uTaNInfo, errorCode);
        nontrans->nameToUnicode(aN, aNuN, aNuNInfo, errorCode);
        nontrans->nameToASCII(uN, uNaN, uNaNInfo, errorCode);
        if(errorCode.errIfFailureAndReset("second-level processing [%d/%s] %s",
                                          static_cast<int>(i), testCase.o, testCase.s)
        ) {
            continue;
        }
        if(aN!=uNaN) {
            prettify(aN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            prettify(uNaN).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
            errln("N.nameToASCII([%d] %s)!=N.nameToUnicode().N.nameToASCII() "
                  "(errors %04lx) %s vs. %s",
                  static_cast<int>(i), testCase.s, aNInfo.getErrors(), buffer, buffer2);
            continue;
        }
        if(aT!=uTaN) {
            prettify(aT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            prettify(uTaN).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
            errln("T.nameToASCII([%d] %s)!=T.nameToUnicode().N.nameToASCII() "
                  "(errors %04lx) %s vs. %s",
                  static_cast<int>(i), testCase.s, aNInfo.getErrors(), buffer, buffer2);
            continue;
        }
        if(uN!=aNuN) {
            prettify(uN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            prettify(aNuN).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
            errln("N.nameToUnicode([%d] %s)!=N.nameToASCII().N.nameToUnicode() "
                  "(errors %04lx) %s vs. %s",
                  static_cast<int>(i), testCase.s, uNInfo.getErrors(), buffer, buffer2);
            continue;
        }
        if(uT!=aTuN) {
            prettify(uT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
            prettify(aTuN).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
            errln("T.nameToUnicode([%d] %s)!=T.nameToASCII().N.nameToUnicode() "
                  "(errors %04lx) %s vs. %s",
                  static_cast<int>(i), testCase.s, uNInfo.getErrors(), buffer, buffer2);
            continue;
        }
        // labelToUnicode
        UnicodeString aTL, uTL, aNL, uNL;
        IDNAInfo aTLInfo, uTLInfo, aNLInfo, uNLInfo;
        trans->labelToASCII(input, aTL, aTLInfo, errorCode);
        trans->labelToUnicode(input, uTL, uTLInfo, errorCode);
        nontrans->labelToASCII(input, aNL, aNLInfo, errorCode);
        nontrans->labelToUnicode(input, uNL, uNLInfo, errorCode);
        if(errorCode.errIfFailureAndReset("labelToXYZ processing [%d/%s] %s",
                                          static_cast<int>(i), testCase.o, testCase.s)
        ) {
            continue;
        }
        if (aN.indexOf(static_cast<char16_t>(0x2e)) < 0) {
            if(aN!=aNL || aNInfo.getErrors()!=aNLInfo.getErrors()) {
                prettify(aN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                prettify(aNL).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
                errln("N.nameToASCII([%d] %s)!=N.labelToASCII() "
                      "(errors %04lx vs %04lx) %s vs. %s",
                      static_cast<int>(i), testCase.s, aNInfo.getErrors(), aNLInfo.getErrors(), buffer, buffer2);
                continue;
            }
        } else {
            if((aNLInfo.getErrors()&UIDNA_ERROR_LABEL_HAS_DOT)==0) {
                errln("N.labelToASCII([%d] %s) errors %04lx missing UIDNA_ERROR_LABEL_HAS_DOT",
                      static_cast<int>(i), testCase.s, static_cast<long>(aNLInfo.getErrors()));
                continue;
            }
        }
        if (aT.indexOf(static_cast<char16_t>(0x2e)) < 0) {
            if(aT!=aTL || aTInfo.getErrors()!=aTLInfo.getErrors()) {
                prettify(aT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                prettify(aTL).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
                errln("T.nameToASCII([%d] %s)!=T.labelToASCII() "
                      "(errors %04lx vs %04lx) %s vs. %s",
                      static_cast<int>(i), testCase.s, aTInfo.getErrors(), aTLInfo.getErrors(), buffer, buffer2);
                continue;
            }
        } else {
            if((aTLInfo.getErrors()&UIDNA_ERROR_LABEL_HAS_DOT)==0) {
                errln("T.labelToASCII([%d] %s) errors %04lx missing UIDNA_ERROR_LABEL_HAS_DOT",
                      static_cast<int>(i), testCase.s, static_cast<long>(aTLInfo.getErrors()));
                continue;
            }
        }
        if (uN.indexOf(static_cast<char16_t>(0x2e)) < 0) {
            if(uN!=uNL || uNInfo.getErrors()!=uNLInfo.getErrors()) {
                prettify(uN).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                prettify(uNL).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
                errln("N.nameToUnicode([%d] %s)!=N.labelToUnicode() "
                      "(errors %04lx vs %04lx) %s vs. %s",
                      static_cast<int>(i), testCase.s, uNInfo.getErrors(), uNLInfo.getErrors(), buffer, buffer2);
                continue;
            }
        } else {
            if((uNLInfo.getErrors()&UIDNA_ERROR_LABEL_HAS_DOT)==0) {
                errln("N.labelToUnicode([%d] %s) errors %04lx missing UIDNA_ERROR_LABEL_HAS_DOT",
                      static_cast<int>(i), testCase.s, static_cast<long>(uNLInfo.getErrors()));
                continue;
            }
        }
        if (uT.indexOf(static_cast<char16_t>(0x2e)) < 0) {
            if(uT!=uTL || uTInfo.getErrors()!=uTLInfo.getErrors()) {
                prettify(uT).extract(0, 0x7fffffff, buffer, UPRV_LENGTHOF(buffer));
                prettify(uTL).extract(0, 0x7fffffff, buffer2, UPRV_LENGTHOF(buffer2));
                errln("T.nameToUnicode([%d] %s)!=T.labelToUnicode() "
                      "(errors %04lx vs %04lx) %s vs. %s",
                      static_cast<int>(i), testCase.s, uTInfo.getErrors(), uTLInfo.getErrors(), buffer, buffer2);
                continue;
            }
        } else {
            if((uTLInfo.getErrors()&UIDNA_ERROR_LABEL_HAS_DOT)==0) {
                errln("T.labelToUnicode([%d] %s) errors %04lx missing UIDNA_ERROR_LABEL_HAS_DOT",
                      static_cast<int>(i), testCase.s, static_cast<long>(uTLInfo.getErrors()));
                continue;
            }
        }
        // Differences between transitional and nontransitional processing
        if(mode=='B') {
            if( aNInfo.isTransitionalDifferent() ||
                aTInfo.isTransitionalDifferent() ||
                uNInfo.isTransitionalDifferent() ||
                uTInfo.isTransitionalDifferent() ||
                aNLInfo.isTransitionalDifferent() ||
                aTLInfo.isTransitionalDifferent() ||
                uNLInfo.isTransitionalDifferent() ||
                uTLInfo.isTransitionalDifferent()
            ) {
                errln("B.process([%d] %s) isTransitionalDifferent()", static_cast<int>(i), testCase.s);
                continue;
            }
            if( aN!=aT || uN!=uT || aNL!=aTL || uNL!=uTL ||
                aNInfo.getErrors()!=aTInfo.getErrors() || uNInfo.getErrors()!=uTInfo.getErrors() ||
                aNLInfo.getErrors()!=aTLInfo.getErrors() || uNLInfo.getErrors()!=uTLInfo.getErrors()
            ) {
                errln("N.process([%d] %s) vs. T.process() different errors or result strings",
                      static_cast<int>(i), testCase.s);
                continue;
            }
        } else {
            if( !aNInfo.isTransitionalDifferent() ||
                !aTInfo.isTransitionalDifferent() ||
                !uNInfo.isTransitionalDifferent() ||
                !uTInfo.isTransitionalDifferent() ||
                !aNLInfo.isTransitionalDifferent() ||
                !aTLInfo.isTransitionalDifferent() ||
                !uNLInfo.isTransitionalDifferent() ||
                !uTLInfo.isTransitionalDifferent()
            ) {
                errln("%s.process([%d] %s) !isTransitionalDifferent()",
                      testCase.o, static_cast<int>(i), testCase.s);
                continue;
            }
            if(aN==aT || uN==uT || aNL==aTL || uNL==uTL) {
                errln("N.process([%d] %s) vs. T.process() same result strings",
                      static_cast<int>(i), testCase.s);
                continue;
            }
        }
        // UTF-8
        std::string input8, aT8, uT8, aN8, uN8;
        StringByteSink<std::string> aT8Sink(&aT8), uT8Sink(&uT8), aN8Sink(&aN8), uN8Sink(&uN8);
        IDNAInfo aT8Info, uT8Info, aN8Info, uN8Info;
        input.toUTF8String(input8);
        trans->nameToASCII_UTF8(input8, aT8Sink, aT8Info, errorCode);
        trans->nameToUnicodeUTF8(input8, uT8Sink, uT8Info, errorCode);
        nontrans->nameToASCII_UTF8(input8, aN8Sink, aN8Info, errorCode);
        nontrans->nameToUnicodeUTF8(input8, uN8Sink, uN8Info, errorCode);
        if(errorCode.errIfFailureAndReset("UTF-8 processing [%d/%s] %s",
                                          static_cast<int>(i), testCase.o, testCase.s)
        ) {
            continue;
        }
        UnicodeString aT16(UnicodeString::fromUTF8(aT8));
        UnicodeString uT16(UnicodeString::fromUTF8(uT8));
        UnicodeString aN16(UnicodeString::fromUTF8(aN8));
        UnicodeString uN16(UnicodeString::fromUTF8(uN8));
        if( aN8Info.getErrors()!=aNInfo.getErrors() ||
            uN8Info.getErrors()!=uNInfo.getErrors()
        ) {
            errln("N.xyzUTF8([%d] %s) vs. UTF-16 processing different errors %04lx vs. %04lx",
                  static_cast<int>(i), testCase.s,
                  static_cast<long>(aN8Info.getErrors()), static_cast<long>(aNInfo.getErrors()));
            continue;
        }
        if( aT8Info.getErrors()!=aTInfo.getErrors() ||
            uT8Info.getErrors()!=uTInfo.getErrors()
        ) {
            errln("T.xyzUTF8([%d] %s) vs. UTF-16 processing different errors %04lx vs. %04lx",
                  static_cast<int>(i), testCase.s,
                  static_cast<long>(aT8Info.getErrors()), static_cast<long>(aTInfo.getErrors()));
            continue;
        }
        if(aT16!=aT || uT16!=uT || aN16!=aN || uN16!=uN) {
            errln("%s.xyzUTF8([%d] %s) vs. UTF-16 processing different string results",
                  testCase.o, static_cast<int>(i), testCase.s, static_cast<long>(aTInfo.getErrors()));
            continue;
        }
        if( aT8Info.isTransitionalDifferent()!=aTInfo.isTransitionalDifferent() ||
            uT8Info.isTransitionalDifferent()!=uTInfo.isTransitionalDifferent() ||
            aN8Info.isTransitionalDifferent()!=aNInfo.isTransitionalDifferent() ||
            uN8Info.isTransitionalDifferent()!=uNInfo.isTransitionalDifferent()
        ) {
            errln("%s.xyzUTF8([%d] %s) vs. UTF-16 processing different isTransitionalDifferent()",
                  testCase.o, static_cast<int>(i), testCase.s);
            continue;
        }
    }
}

namespace {

const int32_t kNumFields = 7;

void U_CALLCONV
idnaTestLineFn(void *context,
               char *fields[][2], int32_t /* fieldCount */,
               UErrorCode *pErrorCode) {
    reinterpret_cast<UTS46Test *>(context)->idnaTestOneLine(fields, *pErrorCode);
}

UnicodeString s16FromField(char *(&field)[2], const UnicodeString &sameAs) {
    int32_t length = static_cast<int32_t>(field[1] - field[0]);
    UnicodeString s = UnicodeString::fromUTF8(StringPiece(field[0], length)).trim().unescape();
    if (s.isEmpty()) {
        s = sameAs;  // blank means same as another string
    } else if (s == u"\"\"") {
        s.remove();  // explicit empty string (new in Unicode 16)
    }
    return s;
}

std::string statusFromField(char *(&field)[2]) {
    const char *start = u_skipWhitespace(field[0]);
    std::string status;
    if (start != field[1]) {
        int32_t length = static_cast<int32_t>(field[1] - start);
        while (length > 0 && (start[length - 1] == u' ' || start[length - 1] == u'\t')) {
            --length;
        }
        status.assign(start, length);
    }
    return status;
}

}  // namespace

void UTS46Test::checkIdnaTestResult(const char *line, const char *type,
                                    const UnicodeString &expected, const UnicodeString &result,
                                    const char *status, const IDNAInfo &info) {
    // An error in toUnicode or toASCII is indicated by a value in square brackets,
    // such as "[B5 B6]".
    UBool expectedHasErrors = false;
    if (*status != 0) {
        if (*status != u'[') {
            errln("%s  status field does not start with '[': %s\n    %s", type, status, line);
        }
        if (strcmp(status, reinterpret_cast<const char*>(u8"[]")) != 0) {
            expectedHasErrors = true;
        }
        // ICU workaround:
        // We do effectively VerifyDnsLength (we always check for lengths), except,
        // based on past bug reports, we do not do the following in UTS #46 ToASCII:
        // When VerifyDnsLength is true, the empty root label is disallowed.
        // Ignore the expected error if it is the only one.
        // TODO: ICU-22882 - Report the empty root label separately from empty non-root labels.
        if (strncmp(type, "toASCII", 7) == 0 &&  // startsWith
                strcmp(status, "[A4_2]") == 0 && !info.hasErrors()) {
            if (result.endsWith(UnicodeString::readOnlyAlias(u".")) &&
                    // !contains
                    result.indexOf(UnicodeString::readOnlyAlias(u"..")) < 0) {
                expectedHasErrors = false;
            }
        }
    }
    if (expectedHasErrors != info.hasErrors()) {
        errln("%s  expected errors %s %d != %d = actual has errors: %04lx\n    %s",
              type, status, expectedHasErrors, info.hasErrors(), static_cast<long>(info.getErrors()), line);
    }
    if (!expectedHasErrors && expected != result) {
        errln("%s  expected != actual\n    %s", type, line);
        errln(UnicodeString(u"    ") + expected);
        errln(UnicodeString(u"    ") + result);
    }
}

void UTS46Test::idnaTestOneLine(char *fields[][2], UErrorCode &errorCode) {
    // IdnaTestV2.txt (since Unicode 11)
    // Column 1: source
    // The source string to be tested.
    // "" means the empty string.
    UnicodeString source = s16FromField(fields[0], UnicodeString());

    // Column 2: toUnicode
    // The result of applying toUnicode to the source, with Transitional_Processing=false.
    // A blank value means the same as the source value.
    // "" means the empty string.
    UnicodeString toUnicode = s16FromField(fields[1], source);

    // Column 3: toUnicodeStatus
    // A set of status codes, each corresponding to a particular test.
    // A blank value means [].
    std::string toUnicodeStatus = statusFromField(fields[2]);

    // Column 4: toAsciiN
    // The result of applying toASCII to the source, with Transitional_Processing=false.
    // A blank value means the same as the toUnicode value.
    // "" means the empty string.
    UnicodeString toAsciiN = s16FromField(fields[3], toUnicode);

    // Column 5: toAsciiNStatus
    // A set of status codes, each corresponding to a particular test.
    // A blank value means the same as the toUnicodeStatus value.
    std::string toAsciiNStatus = statusFromField(fields[4]);
    if (toAsciiNStatus.empty()) {
        toAsciiNStatus = toUnicodeStatus;
    }

    // Column 6: toAsciiT
    // The result of applying toASCII to the source, with Transitional_Processing=true.
    // A blank value means the same as the toAsciiN value.
    // "" means the empty string.
    UnicodeString toAsciiT = s16FromField(fields[5], toAsciiN);

    // Column 7: toAsciiTStatus
    // A set of status codes, each corresponding to a particular test.
    // A blank value means the same as the toAsciiNStatus value.
    std::string toAsciiTStatus = statusFromField(fields[6]);
    if (toAsciiTStatus.empty()) {
        toAsciiTStatus = toAsciiNStatus;
    }

    // ToASCII/ToUnicode, transitional/nontransitional
    UnicodeString uN, aN, aT;
    IDNAInfo uNInfo, aNInfo, aTInfo;
    nontrans->nameToUnicode(source, uN, uNInfo, errorCode);
    checkIdnaTestResult(fields[0][0], "toUnicodeNontrans", toUnicode, uN,
                        toUnicodeStatus.c_str(), uNInfo);
    nontrans->nameToASCII(source, aN, aNInfo, errorCode);
    checkIdnaTestResult(fields[0][0], "toASCIINontrans", toAsciiN, aN,
                        toAsciiNStatus.c_str(), aNInfo);
    trans->nameToASCII(source, aT, aTInfo, errorCode);
    checkIdnaTestResult(fields[0][0], "toASCIITrans", toAsciiT, aT,
                        toAsciiTStatus.c_str(), aTInfo);
}

namespace {

// TODO: de-duplicate
U_DEFINE_LOCAL_OPEN_POINTER(LocalStdioFilePointer, FILE, fclose);

}  // namespace

void UTS46Test::IdnaTest() {
    IcuTestErrorCode errorCode(*this, "IdnaTest");
    const char *sourceTestDataPath = getSourceTestData(errorCode);
    if (errorCode.errIfFailureAndReset("unable to find the source/test/testdata "
                                       "folder (getSourceTestData())")) {
        return;
    }
    CharString path(sourceTestDataPath, errorCode);
    path.appendPathPart("IdnaTestV2.txt", errorCode);
    LocalStdioFilePointer idnaTestFile(fopen(path.data(), "r"));
    if (idnaTestFile.isNull()) {
        errln("unable to open %s", path.data());
        return;
    }

    // Columns (c1, c2,...) are separated by semicolons.
    // Leading and trailing spaces and tabs in each column are ignored.
    // Comments are indicated with hash marks.
    char *fields[kNumFields][2];
    u_parseDelimitedFile(path.data(), ';', fields, kNumFields, idnaTestLineFn, this, errorCode);
    if (errorCode.errIfFailureAndReset("error parsing IdnaTestV2.txt")) {
        return;
    }
}

#endif  // UCONFIG_NO_IDNA