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      1 /********************************************************************
      2  * COPYRIGHT:
      3  * Copyright (c) 1997-2010, International Business Machines Corporation and
      4  * others. All Rights Reserved.
      5  ********************************************************************/
      6 /*   file name:  strtest.cpp
      7 *   encoding:   US-ASCII
      8 *   tab size:   8 (not used)
      9 *   indentation:4
     10 *
     11 *   created on: 1999nov22
     12 *   created by: Markus W. Scherer
     13 */
     14 
     15 #include <string.h>
     16 
     17 #include "unicode/utypes.h"
     18 #include "unicode/putil.h"
     19 #include "unicode/std_string.h"
     20 #include "unicode/stringpiece.h"
     21 #include "unicode/unistr.h"
     22 #include "unicode/ustring.h"
     23 #include "charstr.h"
     24 #include "intltest.h"
     25 #include "strtest.h"
     26 
     27 StringTest::~StringTest() {}
     28 
     29 void StringTest::TestEndian(void) {
     30     union {
     31         uint8_t byte;
     32         uint16_t word;
     33     } u;
     34     u.word=0x0100;
     35     if(U_IS_BIG_ENDIAN!=u.byte) {
     36         errln("TestEndian: U_IS_BIG_ENDIAN needs to be fixed in platform.h");
     37     }
     38 }
     39 
     40 void StringTest::TestSizeofTypes(void) {
     41     if(U_SIZEOF_WCHAR_T!=sizeof(wchar_t)) {
     42         errln("TestSizeofWCharT: U_SIZEOF_WCHAR_T!=sizeof(wchar_t) - U_SIZEOF_WCHAR_T needs to be fixed in platform.h");
     43     }
     44 #ifdef U_INT64_T_UNAVAILABLE
     45     errln("int64_t and uint64_t are undefined.");
     46 #else
     47     if(8!=sizeof(int64_t)) {
     48         errln("TestSizeofTypes: 8!=sizeof(int64_t) - int64_t needs to be fixed in platform.h");
     49     }
     50     if(8!=sizeof(uint64_t)) {
     51         errln("TestSizeofTypes: 8!=sizeof(uint64_t) - uint64_t needs to be fixed in platform.h");
     52     }
     53 #endif
     54     if(8!=sizeof(double)) {
     55         errln("8!=sizeof(double) - putil.c code may not work");
     56     }
     57     if(4!=sizeof(int32_t)) {
     58         errln("4!=sizeof(int32_t)");
     59     }
     60     if(4!=sizeof(uint32_t)) {
     61         errln("4!=sizeof(uint32_t)");
     62     }
     63     if(2!=sizeof(int16_t)) {
     64         errln("2!=sizeof(int16_t)");
     65     }
     66     if(2!=sizeof(uint16_t)) {
     67         errln("2!=sizeof(uint16_t)");
     68     }
     69     if(2!=sizeof(UChar)) {
     70         errln("2!=sizeof(UChar)");
     71     }
     72     if(1!=sizeof(int8_t)) {
     73         errln("1!=sizeof(int8_t)");
     74     }
     75     if(1!=sizeof(uint8_t)) {
     76         errln("1!=sizeof(uint8_t)");
     77     }
     78     if(1!=sizeof(UBool)) {
     79         errln("1!=sizeof(UBool)");
     80     }
     81 }
     82 
     83 void StringTest::TestCharsetFamily(void) {
     84     unsigned char c='A';
     85     if( (U_CHARSET_FAMILY==U_ASCII_FAMILY && c!=0x41) ||
     86         (U_CHARSET_FAMILY==U_EBCDIC_FAMILY && c!=0xc1)
     87     ) {
     88         errln("TestCharsetFamily: U_CHARSET_FAMILY needs to be fixed in platform.h");
     89     }
     90 }
     91 
     92 U_STRING_DECL(ustringVar, "aZ0 -", 5);
     93 
     94 void
     95 StringTest::Test_U_STRING() {
     96     U_STRING_INIT(ustringVar, "aZ0 -", 5);
     97     if( sizeof(ustringVar)/sizeof(*ustringVar)!=6 ||
     98         ustringVar[0]!=0x61 ||
     99         ustringVar[1]!=0x5a ||
    100         ustringVar[2]!=0x30 ||
    101         ustringVar[3]!=0x20 ||
    102         ustringVar[4]!=0x2d ||
    103         ustringVar[5]!=0
    104     ) {
    105         errln("Test_U_STRING: U_STRING_DECL with U_STRING_INIT does not work right! "
    106               "See putil.h and utypes.h with platform.h.");
    107     }
    108 }
    109 
    110 void
    111 StringTest::Test_UNICODE_STRING() {
    112     UnicodeString ustringVar=UNICODE_STRING("aZ0 -", 5);
    113     if( ustringVar.length()!=5 ||
    114         ustringVar[0]!=0x61 ||
    115         ustringVar[1]!=0x5a ||
    116         ustringVar[2]!=0x30 ||
    117         ustringVar[3]!=0x20 ||
    118         ustringVar[4]!=0x2d
    119     ) {
    120         errln("Test_UNICODE_STRING: UNICODE_STRING does not work right! "
    121               "See unistr.h and utypes.h with platform.h.");
    122     }
    123 }
    124 
    125 void
    126 StringTest::Test_UNICODE_STRING_SIMPLE() {
    127     UnicodeString ustringVar=UNICODE_STRING_SIMPLE("aZ0 -");
    128     if( ustringVar.length()!=5 ||
    129         ustringVar[0]!=0x61 ||
    130         ustringVar[1]!=0x5a ||
    131         ustringVar[2]!=0x30 ||
    132         ustringVar[3]!=0x20 ||
    133         ustringVar[4]!=0x2d
    134     ) {
    135         errln("Test_UNICODE_STRING_SIMPLE: UNICODE_STRING_SIMPLE does not work right! "
    136               "See unistr.h and utypes.h with platform.h.");
    137     }
    138 }
    139 
    140 void
    141 StringTest::Test_UTF8_COUNT_TRAIL_BYTES() {
    142     if(UTF8_COUNT_TRAIL_BYTES(0x7F) != 0
    143         || UTF8_COUNT_TRAIL_BYTES(0xC0) != 1
    144         || UTF8_COUNT_TRAIL_BYTES(0xE0) != 2
    145         || UTF8_COUNT_TRAIL_BYTES(0xF0) != 3)
    146     {
    147         errln("Test_UTF8_COUNT_TRAIL_BYTES: UTF8_COUNT_TRAIL_BYTES does not work right! "
    148               "See utf8.h.");
    149     }
    150 }
    151 
    152 void StringTest::runIndexedTest(int32_t index, UBool exec, const char *&name, char * /*par*/) {
    153     if(exec) {
    154         logln("TestSuite Character and String Test: ");
    155     }
    156     TESTCASE_AUTO_BEGIN;
    157     TESTCASE_AUTO(TestEndian);
    158     TESTCASE_AUTO(TestSizeofTypes);
    159     TESTCASE_AUTO(TestCharsetFamily);
    160     TESTCASE_AUTO(Test_U_STRING);
    161     TESTCASE_AUTO(Test_UNICODE_STRING);
    162     TESTCASE_AUTO(Test_UNICODE_STRING_SIMPLE);
    163     TESTCASE_AUTO(Test_UTF8_COUNT_TRAIL_BYTES);
    164     TESTCASE_AUTO(TestSTLCompatibility);
    165     TESTCASE_AUTO(TestStdNamespaceQualifier);
    166     TESTCASE_AUTO(TestUsingStdNamespace);
    167     TESTCASE_AUTO(TestStringPiece);
    168     TESTCASE_AUTO(TestStringPieceComparisons);
    169     TESTCASE_AUTO(TestByteSink);
    170     TESTCASE_AUTO(TestCheckedArrayByteSink);
    171     TESTCASE_AUTO(TestStringByteSink);
    172     TESTCASE_AUTO(TestCharString);
    173     TESTCASE_AUTO_END;
    174 }
    175 
    176 // Syntax check for the correct namespace qualifier for the standard string class.
    177 void
    178 StringTest::TestStdNamespaceQualifier() {
    179 #if U_HAVE_STD_STRING
    180     U_STD_NSQ string s="abc xyz";
    181     U_STD_NSQ string t="abc";
    182     t.append(" ");
    183     t.append("xyz");
    184     if(s!=t) {
    185         errln("standard string concatenation error: %s != %s", s.c_str(), t.c_str());
    186     }
    187 #endif
    188 }
    189 
    190 void
    191 StringTest::TestUsingStdNamespace() {
    192 #if U_HAVE_STD_STRING
    193     // Now test that "using namespace std;" is defined correctly.
    194     U_STD_NS_USE
    195 
    196     string s="abc xyz";
    197     string t="abc";
    198     t.append(" ");
    199     t.append("xyz");
    200     if(s!=t) {
    201         errln("standard string concatenation error: %s != %s", s.c_str(), t.c_str());
    202     }
    203 #endif
    204 }
    205 
    206 void
    207 StringTest::TestStringPiece() {
    208     // Default constructor.
    209     StringPiece empty;
    210     if(!empty.empty() || empty.data()!=NULL || empty.length()!=0 || empty.size()!=0) {
    211         errln("StringPiece() failed");
    212     }
    213     // Construct from NULL const char * pointer.
    214     StringPiece null(NULL);
    215     if(!null.empty() || null.data()!=NULL || null.length()!=0 || null.size()!=0) {
    216         errln("StringPiece(NULL) failed");
    217     }
    218     // Construct from const char * pointer.
    219     static const char *abc_chars="abc";
    220     StringPiece abc(abc_chars);
    221     if(abc.empty() || abc.data()!=abc_chars || abc.length()!=3 || abc.size()!=3) {
    222         errln("StringPiece(abc_chars) failed");
    223     }
    224     // Construct from const char * pointer and length.
    225     static const char *abcdefg_chars="abcdefg";
    226     StringPiece abcd(abcdefg_chars, 4);
    227     if(abcd.empty() || abcd.data()!=abcdefg_chars || abcd.length()!=4 || abcd.size()!=4) {
    228         errln("StringPiece(abcdefg_chars, 4) failed");
    229     }
    230 #if U_HAVE_STD_STRING
    231     // Construct from std::string.
    232     U_STD_NSQ string uvwxyz_string("uvwxyz");
    233     StringPiece uvwxyz(uvwxyz_string);
    234     if(uvwxyz.empty() || uvwxyz.data()!=uvwxyz_string.data() || uvwxyz.length()!=6 || uvwxyz.size()!=6) {
    235         errln("StringPiece(uvwxyz_string) failed");
    236     }
    237 #endif
    238     // Substring constructor with pos.
    239     StringPiece sp(abcd, -1);
    240     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
    241         errln("StringPiece(abcd, -1) failed");
    242     }
    243     sp=StringPiece(abcd, 5);
    244     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    245         errln("StringPiece(abcd, 5) failed");
    246     }
    247     sp=StringPiece(abcd, 2);
    248     if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
    249         errln("StringPiece(abcd, -1) failed");
    250     }
    251     // Substring constructor with pos and len.
    252     sp=StringPiece(abcd, -1, 8);
    253     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
    254         errln("StringPiece(abcd, -1, 8) failed");
    255     }
    256     sp=StringPiece(abcd, 5, 8);
    257     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    258         errln("StringPiece(abcd, 5, 8) failed");
    259     }
    260     sp=StringPiece(abcd, 2, 8);
    261     if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
    262         errln("StringPiece(abcd, -1) failed");
    263     }
    264     sp=StringPiece(abcd, 2, -1);
    265     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    266         errln("StringPiece(abcd, 5, -1) failed");
    267     }
    268     // static const npos
    269     const int32_t *ptr_npos=&StringPiece::npos;
    270     if(StringPiece::npos!=0x7fffffff || *ptr_npos!=0x7fffffff) {
    271         errln("StringPiece::npos!=0x7fffffff");
    272     }
    273     // substr() method with pos, using len=npos.
    274     sp=abcd.substr(-1);
    275     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
    276         errln("abcd.substr(-1) failed");
    277     }
    278     sp=abcd.substr(5);
    279     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    280         errln("abcd.substr(5) failed");
    281     }
    282     sp=abcd.substr(2);
    283     if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
    284         errln("abcd.substr(-1) failed");
    285     }
    286     // substr() method with pos and len.
    287     sp=abcd.substr(-1, 8);
    288     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
    289         errln("abcd.substr(-1, 8) failed");
    290     }
    291     sp=abcd.substr(5, 8);
    292     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    293         errln("abcd.substr(5, 8) failed");
    294     }
    295     sp=abcd.substr(2, 8);
    296     if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
    297         errln("abcd.substr(-1) failed");
    298     }
    299     sp=abcd.substr(2, -1);
    300     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    301         errln("abcd.substr(5, -1) failed");
    302     }
    303     // clear()
    304     sp=abcd;
    305     sp.clear();
    306     if(!sp.empty() || sp.data()!=NULL || sp.length()!=0 || sp.size()!=0) {
    307         errln("abcd.clear() failed");
    308     }
    309     // remove_prefix()
    310     sp=abcd;
    311     sp.remove_prefix(-1);
    312     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
    313         errln("abcd.remove_prefix(-1) failed");
    314     }
    315     sp=abcd;
    316     sp.remove_prefix(2);
    317     if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
    318         errln("abcd.remove_prefix(2) failed");
    319     }
    320     sp=abcd;
    321     sp.remove_prefix(5);
    322     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    323         errln("abcd.remove_prefix(5) failed");
    324     }
    325     // remove_suffix()
    326     sp=abcd;
    327     sp.remove_suffix(-1);
    328     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
    329         errln("abcd.remove_suffix(-1) failed");
    330     }
    331     sp=abcd;
    332     sp.remove_suffix(2);
    333     if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=2 || sp.size()!=2) {
    334         errln("abcd.remove_suffix(2) failed");
    335     }
    336     sp=abcd;
    337     sp.remove_suffix(5);
    338     if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
    339         errln("abcd.remove_suffix(5) failed");
    340     }
    341 }
    342 
    343 void
    344 StringTest::TestStringPieceComparisons() {
    345     StringPiece empty;
    346     StringPiece null(NULL);
    347     StringPiece abc("abc");
    348     StringPiece abcd("abcdefg", 4);
    349     StringPiece abx("abx");
    350     if(empty!=null) {
    351         errln("empty!=null");
    352     }
    353     if(empty==abc) {
    354         errln("empty==abc");
    355     }
    356     if(abc==abcd) {
    357         errln("abc==abcd");
    358     }
    359     abcd.remove_suffix(1);
    360     if(abc!=abcd) {
    361         errln("abc!=abcd.remove_suffix(1)");
    362     }
    363     if(abc==abx) {
    364         errln("abc==abx");
    365     }
    366 }
    367 
    368 // Verify that ByteSink is subclassable and Flush() overridable.
    369 class SimpleByteSink : public ByteSink {
    370 public:
    371     SimpleByteSink(char *outbuf) : fOutbuf(outbuf), fLength(0) {}
    372     virtual void Append(const char *bytes, int32_t n) {
    373         if(fOutbuf != bytes) {
    374             memcpy(fOutbuf, bytes, n);
    375         }
    376         fOutbuf += n;
    377         fLength += n;
    378     }
    379     virtual void Flush() { Append("z", 1); }
    380     int32_t length() { return fLength; }
    381 private:
    382     char *fOutbuf;
    383     int32_t fLength;
    384 };
    385 
    386 // Test the ByteSink base class.
    387 void
    388 StringTest::TestByteSink() {
    389     char buffer[20];
    390     buffer[4] = '!';
    391     SimpleByteSink sink(buffer);
    392     sink.Append("abc", 3);
    393     sink.Flush();
    394     if(!(sink.length() == 4 && 0 == memcmp("abcz", buffer, 4) && buffer[4] == '!')) {
    395         errln("ByteSink (SimpleByteSink) did not Append() or Flush() as expected");
    396         return;
    397     }
    398     char scratch[20];
    399     int32_t capacity = -1;
    400     char *dest = sink.GetAppendBuffer(0, 50, scratch, (int32_t)sizeof(scratch), &capacity);
    401     if(dest != NULL || capacity != 0) {
    402         errln("ByteSink.GetAppendBuffer(min_capacity<1) did not properly return NULL[0]");
    403         return;
    404     }
    405     dest = sink.GetAppendBuffer(10, 50, scratch, 9, &capacity);
    406     if(dest != NULL || capacity != 0) {
    407         errln("ByteSink.GetAppendBuffer(scratch_capacity<min_capacity) did not properly return NULL[0]");
    408         return;
    409     }
    410     dest = sink.GetAppendBuffer(5, 50, scratch, (int32_t)sizeof(scratch), &capacity);
    411     if(dest != scratch || capacity != (int32_t)sizeof(scratch)) {
    412         errln("ByteSink.GetAppendBuffer() did not properly return the scratch buffer");
    413     }
    414 }
    415 
    416 void
    417 StringTest::TestCheckedArrayByteSink() {
    418     char buffer[20];  // < 26 for the test code to work
    419     buffer[3] = '!';
    420     CheckedArrayByteSink sink(buffer, (int32_t)sizeof(buffer));
    421     sink.Append("abc", 3);
    422     if(!(sink.NumberOfBytesAppended() == 3 && sink.NumberOfBytesWritten() == 3 &&
    423          0 == memcmp("abc", buffer, 3) && buffer[3] == '!') &&
    424          !sink.Overflowed()
    425     ) {
    426         errln("CheckedArrayByteSink did not Append() as expected");
    427         return;
    428     }
    429     char scratch[10];
    430     int32_t capacity = -1;
    431     char *dest = sink.GetAppendBuffer(0, 50, scratch, (int32_t)sizeof(scratch), &capacity);
    432     if(dest != NULL || capacity != 0) {
    433         errln("CheckedArrayByteSink.GetAppendBuffer(min_capacity<1) did not properly return NULL[0]");
    434         return;
    435     }
    436     dest = sink.GetAppendBuffer(10, 50, scratch, 9, &capacity);
    437     if(dest != NULL || capacity != 0) {
    438         errln("CheckedArrayByteSink.GetAppendBuffer(scratch_capacity<min_capacity) did not properly return NULL[0]");
    439         return;
    440     }
    441     dest = sink.GetAppendBuffer(10, 50, scratch, (int32_t)sizeof(scratch), &capacity);
    442     if(dest != buffer + 3 || capacity != (int32_t)sizeof(buffer) - 3) {
    443         errln("CheckedArrayByteSink.GetAppendBuffer() did not properly return its own buffer");
    444         return;
    445     }
    446     memcpy(dest, "defghijklm", 10);
    447     sink.Append(dest, 10);
    448     if(!(sink.NumberOfBytesAppended() == 13 && sink.NumberOfBytesWritten() == 13 &&
    449          0 == memcmp("abcdefghijklm", buffer, 13) &&
    450          !sink.Overflowed())
    451     ) {
    452         errln("CheckedArrayByteSink did not Append(its own buffer) as expected");
    453         return;
    454     }
    455     dest = sink.GetAppendBuffer(10, 50, scratch, (int32_t)sizeof(scratch), &capacity);
    456     if(dest != scratch || capacity != (int32_t)sizeof(scratch)) {
    457         errln("CheckedArrayByteSink.GetAppendBuffer() did not properly return the scratch buffer");
    458     }
    459     memcpy(dest, "nopqrstuvw", 10);
    460     sink.Append(dest, 10);
    461     if(!(sink.NumberOfBytesAppended() == 23 &&
    462          sink.NumberOfBytesWritten() == (int32_t)sizeof(buffer) &&
    463          0 == memcmp("abcdefghijklmnopqrstuvwxyz", buffer, (int32_t)sizeof(buffer)) &&
    464          sink.Overflowed())
    465     ) {
    466         errln("CheckedArrayByteSink did not Append(scratch buffer) as expected");
    467         return;
    468     }
    469     sink.Reset().Append("123", 3);
    470     if(!(sink.NumberOfBytesAppended() == 3 && sink.NumberOfBytesWritten() == 3 &&
    471          0 == memcmp("123defghijklmnopqrstuvwxyz", buffer, (int32_t)sizeof(buffer)) &&
    472          !sink.Overflowed())
    473     ) {
    474         errln("CheckedArrayByteSink did not Reset().Append() as expected");
    475         return;
    476     }
    477 }
    478 
    479 void
    480 StringTest::TestStringByteSink() {
    481 #if U_HAVE_STD_STRING
    482     // Not much to test because only the constructor and Append()
    483     // are implemented, and trivially so.
    484     U_STD_NSQ string result("abc");  // std::string
    485     StringByteSink<U_STD_NSQ string> sink(&result);
    486     sink.Append("def", 3);
    487     if(result != "abcdef") {
    488         errln("StringByteSink did not Append() as expected");
    489     }
    490 #endif
    491 }
    492 
    493 #if defined(U_WINDOWS) && defined(_MSC_VER)
    494 #include <vector>
    495 #endif
    496 
    497 void
    498 StringTest::TestSTLCompatibility() {
    499 #if defined(U_WINDOWS) && defined(_MSC_VER)
    500     /* Just make sure that it compiles with STL's placement new usage. */
    501     std::vector<UnicodeString> myvect;
    502     myvect.push_back(UnicodeString("blah"));
    503 #endif
    504 }
    505 
    506 void
    507 StringTest::TestCharString() {
    508     IcuTestErrorCode errorCode(*this, "TestCharString()");
    509     char expected[400];
    510     static const char longStr[] =
    511         "This is a long string that is meant to cause reallocation of the internal buffer of CharString.";
    512     CharString chStr(longStr, errorCode);
    513     if (0 != strcmp(longStr, chStr.data()) || (int32_t)strlen(longStr) != chStr.length()) {
    514         errln("CharString(longStr) failed.");
    515     }
    516     CharString test("Test", errorCode);
    517     CharString copy(test,errorCode);
    518     copy.copyFrom(chStr, errorCode);
    519     if (0 != strcmp(longStr, copy.data()) || (int32_t)strlen(longStr) != copy.length()) {
    520         errln("CharString.copyFrom() failed.");
    521     }
    522     StringPiece sp(chStr.toStringPiece());
    523     sp.remove_prefix(4);
    524     chStr.append(sp, errorCode).append(chStr, errorCode);
    525     strcpy(expected, longStr);
    526     strcat(expected, longStr+4);
    527     strcat(expected, longStr);
    528     strcat(expected, longStr+4);
    529     if (0 != strcmp(expected, chStr.data()) || (int32_t)strlen(expected) != chStr.length()) {
    530         errln("CharString(longStr).append(substring of self).append(self) failed.");
    531     }
    532     chStr.clear().append("abc", errorCode).append("defghij", 3, errorCode);
    533     if (0 != strcmp("abcdef", chStr.data()) || 6 != chStr.length()) {
    534         errln("CharString.clear().append(abc).append(defghij, 3) failed.");
    535     }
    536     chStr.appendInvariantChars(UNICODE_STRING_SIMPLE(
    537         "This is a long string that is meant to cause reallocation of the internal buffer of CharString."),
    538         errorCode);
    539     strcpy(expected, "abcdef");
    540     strcat(expected, longStr);
    541     if (0 != strcmp(expected, chStr.data()) || (int32_t)strlen(expected) != chStr.length()) {
    542         errln("CharString.appendInvariantChars(longStr) failed.");
    543     }
    544     int32_t appendCapacity = 0;
    545     char *buffer = chStr.getAppendBuffer(5, 10, appendCapacity, errorCode);
    546     if (errorCode.isFailure()) {
    547         return;
    548     }
    549     memcpy(buffer, "*****", 5);
    550     chStr.append(buffer, 5, errorCode);
    551     chStr.truncate(chStr.length()-3);
    552     strcat(expected, "**");
    553     if (0 != strcmp(expected, chStr.data()) || (int32_t)strlen(expected) != chStr.length()) {
    554         errln("CharString.getAppendBuffer().append(**) failed.");
    555     }
    556 }
    557