1 ///////////////////////////////////////////////////////////////////////////////
2 // Name: tests/strings/strings.cpp
3 // Purpose: wxString unit test
4 // Author: Vadim Zeitlin, Wlodzimierz ABX Skiba
5 // Created: 2004-04-19
6 // Copyright: (c) 2004 Vadim Zeitlin, Wlodzimierz Skiba
7 ///////////////////////////////////////////////////////////////////////////////
8
9 // ----------------------------------------------------------------------------
10 // headers
11 // ----------------------------------------------------------------------------
12
13 #include "testprec.h"
14
15 #ifdef __BORLANDC__
16 #pragma hdrstop
17 #endif
18
19 #ifndef WX_PRECOMP
20 #include "wx/wx.h"
21 #endif // WX_PRECOMP
22
23 // ----------------------------------------------------------------------------
24 // test class
25 // ----------------------------------------------------------------------------
26
27 class StringTestCase : public CppUnit::TestCase
28 {
29 public:
30 StringTestCase();
31
32 private:
33 CPPUNIT_TEST_SUITE( StringTestCase );
34 CPPUNIT_TEST( String );
35 CPPUNIT_TEST( PChar );
36 CPPUNIT_TEST( Format );
37 CPPUNIT_TEST( FormatUnicode );
38 CPPUNIT_TEST( Constructors );
39 CPPUNIT_TEST( StaticConstructors );
40 CPPUNIT_TEST( Extraction );
41 CPPUNIT_TEST( Trim );
42 CPPUNIT_TEST( Find );
43 CPPUNIT_TEST( Replace );
44 CPPUNIT_TEST( Match );
45 CPPUNIT_TEST( CaseChanges );
46 CPPUNIT_TEST( Compare );
47 CPPUNIT_TEST( CompareNoCase );
48 CPPUNIT_TEST( Contains );
49 CPPUNIT_TEST( ToLong );
50 CPPUNIT_TEST( ToULong );
51 #ifdef wxLongLong_t
52 CPPUNIT_TEST( ToLongLong );
53 CPPUNIT_TEST( ToULongLong );
54 #endif // wxLongLong_t
55 CPPUNIT_TEST( ToDouble );
56 CPPUNIT_TEST( FromDouble );
57 CPPUNIT_TEST( StringBuf );
58 CPPUNIT_TEST( UTF8Buf );
59 CPPUNIT_TEST( CStrDataTernaryOperator );
60 CPPUNIT_TEST( CStrDataOperators );
61 CPPUNIT_TEST( CStrDataImplicitConversion );
62 CPPUNIT_TEST( ExplicitConversion );
63 CPPUNIT_TEST( IndexedAccess );
64 CPPUNIT_TEST( BeforeAndAfter );
65 CPPUNIT_TEST( ScopedBuffers );
66 CPPUNIT_TEST_SUITE_END();
67
68 void String();
69 void PChar();
70 void Format();
71 void FormatUnicode();
72 void Constructors();
73 void StaticConstructors();
74 void Extraction();
75 void Trim();
76 void Find();
77 void Replace();
78 void Match();
79 void CaseChanges();
80 void Compare();
81 void CompareNoCase();
82 void Contains();
83 void ToLong();
84 void ToULong();
85 #ifdef wxLongLong_t
86 void ToLongLong();
87 void ToULongLong();
88 #endif // wxLongLong_t
89 void ToDouble();
90 void FromDouble();
91 void StringBuf();
92 void UTF8Buf();
93 void CStrDataTernaryOperator();
94 void DoCStrDataTernaryOperator(bool cond);
95 void CStrDataOperators();
96 void CStrDataImplicitConversion();
97 void ExplicitConversion();
98 void IndexedAccess();
99 void BeforeAndAfter();
100 void ScopedBuffers();
101
102 DECLARE_NO_COPY_CLASS(StringTestCase)
103 };
104
105 // register in the unnamed registry so that these tests are run by default
106 CPPUNIT_TEST_SUITE_REGISTRATION( StringTestCase );
107
108 // also include in its own registry so that these tests can be run alone
109 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( StringTestCase, "StringTestCase" );
110
StringTestCase()111 StringTestCase::StringTestCase()
112 {
113 }
114
String()115 void StringTestCase::String()
116 {
117 wxString a, b, c;
118
119 a.reserve (128);
120 b.reserve (128);
121 c.reserve (128);
122
123 for (int i = 0; i < 2; ++i)
124 {
125 a = wxT("Hello");
126 b = wxT(" world");
127 c = wxT("! How'ya doin'?");
128 a += b;
129 a += c;
130 c = wxT("Hello world! What's up?");
131 CPPUNIT_ASSERT( c != a );
132 }
133 }
134
PChar()135 void StringTestCase::PChar()
136 {
137 wxChar a [128];
138 wxChar b [128];
139 wxChar c [128];
140
141 for (int i = 0; i < 2; ++i)
142 {
143 wxStrcpy (a, wxT("Hello"));
144 wxStrcpy (b, wxT(" world"));
145 wxStrcpy (c, wxT("! How'ya doin'?"));
146 wxStrcat (a, b);
147 wxStrcat (a, c);
148 wxStrcpy (c, wxT("Hello world! What's up?"));
149 CPPUNIT_ASSERT( wxStrcmp (c, a) != 0 );
150 }
151 }
152
Format()153 void StringTestCase::Format()
154 {
155 wxString s1,s2;
156 s1.Printf(wxT("%03d"), 18);
157 CPPUNIT_ASSERT( s1 == wxString::Format(wxT("%03d"), 18) );
158 s2.Printf(wxT("Number 18: %s\n"), s1.c_str());
159 CPPUNIT_ASSERT( s2 == wxString::Format(wxT("Number 18: %s\n"), s1.c_str()) );
160
161 static const size_t lengths[] = { 1, 512, 1024, 1025, 2048, 4096, 4097 };
162 for ( size_t n = 0; n < WXSIZEOF(lengths); n++ )
163 {
164 const size_t len = lengths[n];
165
166 wxString s(wxT('Z'), len);
167 CPPUNIT_ASSERT_EQUAL( len, wxString::Format(wxT("%s"), s.c_str()).length());
168 }
169
170
171 CPPUNIT_ASSERT_EQUAL
172 (
173 "two one",
174 wxString::Format(wxT("%2$s %1$s"), wxT("one"), wxT("two"))
175 );
176 }
177
FormatUnicode()178 void StringTestCase::FormatUnicode()
179 {
180 #if wxUSE_UNICODE
181 const char *UNICODE_STR = "Iestat\xC4\xAB %i%i";
182 //const char *UNICODE_STR = "Iestat\xCC\x84 %i%i";
183
184 wxString fmt = wxString::FromUTF8(UNICODE_STR);
185 wxString s = wxString::Format(fmt, 1, 1);
186 wxString expected(fmt);
187 expected.Replace("%i", "1");
188 CPPUNIT_ASSERT_EQUAL( expected, s );
189 #endif // wxUSE_UNICODE
190 }
191
Constructors()192 void StringTestCase::Constructors()
193 {
194 CPPUNIT_ASSERT_EQUAL( "", wxString('Z', 0) );
195 CPPUNIT_ASSERT_EQUAL( "Z", wxString('Z') );
196 CPPUNIT_ASSERT_EQUAL( "ZZZZ", wxString('Z', 4) );
197 CPPUNIT_ASSERT_EQUAL( "Hell", wxString("Hello", 4) );
198 CPPUNIT_ASSERT_EQUAL( "Hello", wxString("Hello", 5) );
199
200 #if wxUSE_UNICODE
201 CPPUNIT_ASSERT_EQUAL( L"", wxString(L'Z', 0) );
202 CPPUNIT_ASSERT_EQUAL( L"Z", wxString(L'Z') );
203 CPPUNIT_ASSERT_EQUAL( L"ZZZZ", wxString(L'Z', 4) );
204 CPPUNIT_ASSERT_EQUAL( L"Hell", wxString(L"Hello", 4) );
205 CPPUNIT_ASSERT_EQUAL( L"Hello", wxString(L"Hello", 5) );
206 #endif // wxUSE_UNICODE
207
208 CPPUNIT_ASSERT_EQUAL( 0, wxString(wxString(), 17).length() );
209
210 #if wxUSE_UNICODE_UTF8
211 // This string has 3 characters (<h>, <e'> and <l>), not 4 when using UTF-8
212 // locale!
213 if ( wxConvLibc.IsUTF8() )
214 {
215 wxString s3("h\xc3\xa9llo", 4);
216 CPPUNIT_ASSERT_EQUAL( 3, s3.length() );
217 CPPUNIT_ASSERT_EQUAL( 'l', (char)s3[2] );
218 }
219 #endif // wxUSE_UNICODE_UTF8
220
221
222 static const char *s = "?really!";
223 const char *start = wxStrchr(s, 'r');
224 const char *end = wxStrchr(s, '!');
225 CPPUNIT_ASSERT_EQUAL( "really", wxString(start, end) );
226
227 // test if creating string from NULL C pointer works:
228 CPPUNIT_ASSERT_EQUAL( "", wxString((const char *)NULL) );
229 }
230
StaticConstructors()231 void StringTestCase::StaticConstructors()
232 {
233 CPPUNIT_ASSERT_EQUAL( "", wxString::FromAscii("") );
234 CPPUNIT_ASSERT_EQUAL( "", wxString::FromAscii("Hello", 0) );
235 CPPUNIT_ASSERT_EQUAL( "Hell", wxString::FromAscii("Hello", 4) );
236 CPPUNIT_ASSERT_EQUAL( "Hello", wxString::FromAscii("Hello", 5) );
237 CPPUNIT_ASSERT_EQUAL( "Hello", wxString::FromAscii("Hello") );
238
239 // FIXME: this doesn't work currently but should!
240 //CPPUNIT_ASSERT_EQUAL( 1, wxString::FromAscii("", 1).length() );
241
242
243 CPPUNIT_ASSERT_EQUAL( "", wxString::FromUTF8("") );
244 CPPUNIT_ASSERT_EQUAL( "", wxString::FromUTF8("Hello", 0) );
245 CPPUNIT_ASSERT_EQUAL( "Hell", wxString::FromUTF8("Hello", 4) );
246 CPPUNIT_ASSERT_EQUAL( "Hello", wxString::FromUTF8("Hello", 5) );
247 CPPUNIT_ASSERT_EQUAL( "Hello", wxString::FromUTF8("Hello") );
248
249 CPPUNIT_ASSERT_EQUAL( 2, wxString::FromUTF8("h\xc3\xa9llo", 3).length() );
250
251
252 //CPPUNIT_ASSERT_EQUAL( 1, wxString::FromUTF8("", 1).length() );
253 }
254
Extraction()255 void StringTestCase::Extraction()
256 {
257 wxString s(wxT("Hello, world!"));
258
259 CPPUNIT_ASSERT( wxStrcmp( s.c_str() , wxT("Hello, world!") ) == 0 );
260 CPPUNIT_ASSERT( wxStrcmp( s.Left(5).c_str() , wxT("Hello") ) == 0 );
261 CPPUNIT_ASSERT( wxStrcmp( s.Right(6).c_str() , wxT("world!") ) == 0 );
262 CPPUNIT_ASSERT( wxStrcmp( s(3, 5).c_str() , wxT("lo, w") ) == 0 );
263 CPPUNIT_ASSERT( wxStrcmp( s.Mid(3).c_str() , wxT("lo, world!") ) == 0 );
264 CPPUNIT_ASSERT( wxStrcmp( s.substr(3, 5).c_str() , wxT("lo, w") ) == 0 );
265 CPPUNIT_ASSERT( wxStrcmp( s.substr(3).c_str() , wxT("lo, world!") ) == 0 );
266
267 #if wxUSE_UNICODE
268 static const char *germanUTF8 = "Oberfl\303\244che";
269 wxString strUnicode(wxString::FromUTF8(germanUTF8));
270
271 CPPUNIT_ASSERT( strUnicode.Mid(0, 10) == strUnicode );
272 CPPUNIT_ASSERT( strUnicode.Mid(7, 2) == "ch" );
273 #endif // wxUSE_UNICODE
274
275 wxString rest;
276
277 #define TEST_STARTS_WITH(prefix, correct_rest, result) \
278 CPPUNIT_ASSERT_EQUAL(result, s.StartsWith(prefix, &rest)); \
279 if ( result ) \
280 CPPUNIT_ASSERT_EQUAL(correct_rest, rest)
281
282 TEST_STARTS_WITH( wxT("Hello"), wxT(", world!"), true );
283 TEST_STARTS_WITH( wxT("Hello, "), wxT("world!"), true );
284 TEST_STARTS_WITH( wxT("Hello, world!"), wxT(""), true );
285 TEST_STARTS_WITH( wxT("Hello, world!!!"), wxT(""), false );
286 TEST_STARTS_WITH( wxT(""), wxT("Hello, world!"), true );
287 TEST_STARTS_WITH( wxT("Goodbye"), wxT(""), false );
288 TEST_STARTS_WITH( wxT("Hi"), wxT(""), false );
289
290 #undef TEST_STARTS_WITH
291
292 rest = "Hello world";
293 CPPUNIT_ASSERT( rest.StartsWith("Hello ", &rest) );
294 CPPUNIT_ASSERT_EQUAL("world", rest);
295
296 #define TEST_ENDS_WITH(suffix, correct_rest, result) \
297 CPPUNIT_ASSERT_EQUAL(result, s.EndsWith(suffix, &rest)); \
298 if ( result ) \
299 CPPUNIT_ASSERT_EQUAL(correct_rest, rest)
300
301 TEST_ENDS_WITH( wxT(""), wxT("Hello, world!"), true );
302 TEST_ENDS_WITH( wxT("!"), wxT("Hello, world"), true );
303 TEST_ENDS_WITH( wxT(", world!"), wxT("Hello"), true );
304 TEST_ENDS_WITH( wxT("ello, world!"), wxT("H"), true );
305 TEST_ENDS_WITH( wxT("Hello, world!"), wxT(""), true );
306 TEST_ENDS_WITH( wxT("very long string"), wxT(""), false );
307 TEST_ENDS_WITH( wxT("?"), wxT(""), false );
308 TEST_ENDS_WITH( wxT("Hello, world"), wxT(""), false );
309 TEST_ENDS_WITH( wxT("Gello, world!"), wxT(""), false );
310
311 #undef TEST_ENDS_WITH
312 }
313
Trim()314 void StringTestCase::Trim()
315 {
316 #define TEST_TRIM( str , dir , result ) \
317 CPPUNIT_ASSERT( wxString(str).Trim(dir) == result )
318
319 TEST_TRIM( wxT(" Test "), true, wxT(" Test") );
320 TEST_TRIM( wxT(" "), true, wxT("") );
321 TEST_TRIM( wxT(" "), true, wxT("") );
322 TEST_TRIM( wxT(""), true, wxT("") );
323
324 TEST_TRIM( wxT(" Test "), false, wxT("Test ") );
325 TEST_TRIM( wxT(" "), false, wxT("") );
326 TEST_TRIM( wxT(" "), false, wxT("") );
327 TEST_TRIM( wxT(""), false, wxT("") );
328
329 #undef TEST_TRIM
330 }
331
Find()332 void StringTestCase::Find()
333 {
334 #define TEST_FIND( str , start , result ) \
335 CPPUNIT_ASSERT( wxString(str).find(wxT("ell"), start) == result );
336
337 TEST_FIND( wxT("Well, hello world"), 0, 1 );
338 TEST_FIND( wxT("Well, hello world"), 6, 7 );
339 TEST_FIND( wxT("Well, hello world"), 9, wxString::npos );
340
341 #undef TEST_FIND
342 }
343
Replace()344 void StringTestCase::Replace()
345 {
346 #define TEST_REPLACE( original , pos , len , replacement , result ) \
347 { \
348 wxString s = original; \
349 s.replace( pos , len , replacement ); \
350 CPPUNIT_ASSERT_EQUAL( result, s ); \
351 }
352
353 TEST_REPLACE( wxT("012-AWORD-XYZ"), 4, 5, wxT("BWORD"), wxT("012-BWORD-XYZ") );
354 TEST_REPLACE( wxT("increase"), 0, 2, wxT("de"), wxT("decrease") );
355 TEST_REPLACE( wxT("wxWindow"), 8, 0, wxT("s"), wxT("wxWindows") );
356 TEST_REPLACE( wxT("foobar"), 3, 0, wxT("-"), wxT("foo-bar") );
357 TEST_REPLACE( wxT("barfoo"), 0, 6, wxT("foobar"), wxT("foobar") );
358
359
360 #define TEST_NULLCHARREPLACE( o , olen, pos , len , replacement , r, rlen ) \
361 { \
362 wxString s(o,olen); \
363 s.replace( pos , len , replacement ); \
364 CPPUNIT_ASSERT_EQUAL( wxString(r,rlen), s ); \
365 }
366
367 TEST_NULLCHARREPLACE( wxT("null\0char"), 9, 5, 1, wxT("d"),
368 wxT("null\0dhar"), 9 );
369
370 #define TEST_WXREPLACE( o , olen, olds, news, all, r, rlen ) \
371 { \
372 wxString s(o,olen); \
373 s.Replace( olds, news, all ); \
374 CPPUNIT_ASSERT_EQUAL( wxString(r,rlen), s ); \
375 }
376
377 TEST_WXREPLACE( wxT("null\0char"), 9, wxT("c"), wxT("de"), true,
378 wxT("null\0dehar"), 10 );
379
380 TEST_WXREPLACE( wxT("null\0dehar"), 10, wxT("de"), wxT("c"), true,
381 wxT("null\0char"), 9 );
382
383 TEST_WXREPLACE( "life", 4, "f", "", false, "lie", 3 );
384 TEST_WXREPLACE( "life", 4, "f", "", true, "lie", 3 );
385 TEST_WXREPLACE( "life", 4, "fe", "ve", true, "live", 4 );
386 TEST_WXREPLACE( "xx", 2, "x", "yy", true, "yyyy", 4 );
387 TEST_WXREPLACE( "xxx", 3, "xx", "z", true, "zx", 2 );
388
389 #undef TEST_WXREPLACE
390 #undef TEST_NULLCHARREPLACE
391 #undef TEST_REPLACE
392 }
393
Match()394 void StringTestCase::Match()
395 {
396 #define TEST_MATCH( s1 , s2 , result ) \
397 CPPUNIT_ASSERT( wxString(s1).Matches(s2) == result )
398
399 TEST_MATCH( "foobar", "foo*", true );
400 TEST_MATCH( "foobar", "*oo*", true );
401 TEST_MATCH( "foobar", "*bar", true );
402 TEST_MATCH( "foobar", "??????", true );
403 TEST_MATCH( "foobar", "f??b*", true );
404 TEST_MATCH( "foobar", "f?b*", false );
405 TEST_MATCH( "foobar", "*goo*", false );
406 TEST_MATCH( "foobar", "*foo", false );
407 TEST_MATCH( "foobarfoo", "*foo", true );
408 TEST_MATCH( "", "*", true );
409 TEST_MATCH( "", "?", false );
410
411 #undef TEST_MATCH
412 }
413
414
CaseChanges()415 void StringTestCase::CaseChanges()
416 {
417 wxString s1(wxT("Hello!"));
418 wxString s1u(s1);
419 wxString s1l(s1);
420 s1u.MakeUpper();
421 s1l.MakeLower();
422
423 CPPUNIT_ASSERT_EQUAL( wxT("HELLO!"), s1u );
424 CPPUNIT_ASSERT_EQUAL( wxT("hello!"), s1l );
425
426 wxString s2u, s2l;
427 s2u.MakeUpper();
428 s2l.MakeLower();
429
430 CPPUNIT_ASSERT_EQUAL( "", s2u );
431 CPPUNIT_ASSERT_EQUAL( "", s2l );
432
433
434 wxString s3("good bye");
435 CPPUNIT_ASSERT_EQUAL( "Good bye", s3.Capitalize() );
436 s3.MakeCapitalized();
437 CPPUNIT_ASSERT_EQUAL( "Good bye", s3 );
438
439 CPPUNIT_ASSERT_EQUAL( "Abc", wxString("ABC").Capitalize() );
440
441 CPPUNIT_ASSERT_EQUAL( "", wxString().Capitalize() );
442 }
443
Compare()444 void StringTestCase::Compare()
445 {
446 wxString s1 = wxT("AHH");
447 wxString eq = wxT("AHH");
448 wxString neq1 = wxT("HAH");
449 wxString neq2 = wxT("AH");
450 wxString neq3 = wxT("AHHH");
451 wxString neq4 = wxT("AhH");
452
453 CPPUNIT_ASSERT( s1 == eq );
454 CPPUNIT_ASSERT( s1 != neq1 );
455 CPPUNIT_ASSERT( s1 != neq2 );
456 CPPUNIT_ASSERT( s1 != neq3 );
457 CPPUNIT_ASSERT( s1 != neq4 );
458
459 CPPUNIT_ASSERT( s1 == wxT("AHH") );
460 CPPUNIT_ASSERT( s1 != wxT("no") );
461 CPPUNIT_ASSERT( s1 < wxT("AZ") );
462 CPPUNIT_ASSERT( s1 <= wxT("AZ") );
463 CPPUNIT_ASSERT( s1 <= wxT("AHH") );
464 CPPUNIT_ASSERT( s1 > wxT("AA") );
465 CPPUNIT_ASSERT( s1 >= wxT("AA") );
466 CPPUNIT_ASSERT( s1 >= wxT("AHH") );
467
468 // test comparison with C strings in Unicode build (must work in ANSI as
469 // well, of course):
470 CPPUNIT_ASSERT( s1 == "AHH" );
471 CPPUNIT_ASSERT( s1 != "no" );
472 CPPUNIT_ASSERT( s1 < "AZ" );
473 CPPUNIT_ASSERT( s1 <= "AZ" );
474 CPPUNIT_ASSERT( s1 <= "AHH" );
475 CPPUNIT_ASSERT( s1 > "AA" );
476 CPPUNIT_ASSERT( s1 >= "AA" );
477 CPPUNIT_ASSERT( s1 >= "AHH" );
478
479 // wxString _s1 = wxT("A\0HH");
480 // wxString _eq = wxT("A\0HH");
481 // wxString _neq1 = wxT("H\0AH");
482 // wxString _neq2 = wxT("A\0H");
483 // wxString _neq3 = wxT("A\0HHH");
484 // wxString _neq4 = wxT("A\0hH");
485 s1.insert(1,1,'\0');
486 eq.insert(1,1,'\0');
487 neq1.insert(1,1,'\0');
488 neq2.insert(1,1,'\0');
489 neq3.insert(1,1,'\0');
490 neq4.insert(1,1,'\0');
491
492 CPPUNIT_ASSERT( s1 == eq );
493 CPPUNIT_ASSERT( s1 != neq1 );
494 CPPUNIT_ASSERT( s1 != neq2 );
495 CPPUNIT_ASSERT( s1 != neq3 );
496 CPPUNIT_ASSERT( s1 != neq4 );
497
498 CPPUNIT_ASSERT( wxString("\n").Cmp(" ") < 0 );
499 CPPUNIT_ASSERT( wxString("'").Cmp("!") > 0 );
500 CPPUNIT_ASSERT( wxString("!").Cmp("z") < 0 );
501 }
502
CompareNoCase()503 void StringTestCase::CompareNoCase()
504 {
505 wxString s1 = wxT("AHH");
506 wxString eq = wxT("AHH");
507 wxString eq2 = wxT("AhH");
508 wxString eq3 = wxT("ahh");
509 wxString neq = wxT("HAH");
510 wxString neq2 = wxT("AH");
511 wxString neq3 = wxT("AHHH");
512
513 #define CPPUNIT_CNCEQ_ASSERT(s1, s2) CPPUNIT_ASSERT( s1.CmpNoCase(s2) == 0)
514 #define CPPUNIT_CNCNEQ_ASSERT(s1, s2) CPPUNIT_ASSERT( s1.CmpNoCase(s2) != 0)
515
516 CPPUNIT_CNCEQ_ASSERT( s1, eq );
517 CPPUNIT_CNCEQ_ASSERT( s1, eq2 );
518 CPPUNIT_CNCEQ_ASSERT( s1, eq3 );
519
520 CPPUNIT_CNCNEQ_ASSERT( s1, neq );
521 CPPUNIT_CNCNEQ_ASSERT( s1, neq2 );
522 CPPUNIT_CNCNEQ_ASSERT( s1, neq3 );
523
524
525 // wxString _s1 = wxT("A\0HH");
526 // wxString _eq = wxT("A\0HH");
527 // wxString _eq2 = wxT("A\0hH");
528 // wxString _eq3 = wxT("a\0hh");
529 // wxString _neq = wxT("H\0AH");
530 // wxString _neq2 = wxT("A\0H");
531 // wxString _neq3 = wxT("A\0HHH");
532
533 s1.insert(1,1,'\0');
534 eq.insert(1,1,'\0');
535 eq2.insert(1,1,'\0');
536 eq3.insert(1,1,'\0');
537 neq.insert(1,1,'\0');
538 neq2.insert(1,1,'\0');
539 neq3.insert(1,1,'\0');
540
541 CPPUNIT_CNCEQ_ASSERT( s1, eq );
542 CPPUNIT_CNCEQ_ASSERT( s1, eq2 );
543 CPPUNIT_CNCEQ_ASSERT( s1, eq3 );
544
545 CPPUNIT_CNCNEQ_ASSERT( s1, neq );
546 CPPUNIT_CNCNEQ_ASSERT( s1, neq2 );
547 CPPUNIT_CNCNEQ_ASSERT( s1, neq3 );
548
549 CPPUNIT_ASSERT( wxString("\n").CmpNoCase(" ") < 0 );
550 CPPUNIT_ASSERT( wxString("'").CmpNoCase("!") > 0);
551 CPPUNIT_ASSERT( wxString("!").Cmp("Z") < 0 );
552 }
553
Contains()554 void StringTestCase::Contains()
555 {
556 static const struct ContainsData
557 {
558 const wxChar *hay;
559 const wxChar *needle;
560 bool contains;
561 } containsData[] =
562 {
563 { wxT(""), wxT(""), true },
564 { wxT(""), wxT("foo"), false },
565 { wxT("foo"), wxT(""), true },
566 { wxT("foo"), wxT("f"), true },
567 { wxT("foo"), wxT("o"), true },
568 { wxT("foo"), wxT("oo"), true },
569 { wxT("foo"), wxT("ooo"), false },
570 { wxT("foo"), wxT("oooo"), false },
571 { wxT("foo"), wxT("fooo"), false },
572 };
573
574 for ( size_t n = 0; n < WXSIZEOF(containsData); n++ )
575 {
576 const ContainsData& cd = containsData[n];
577 CPPUNIT_ASSERT_EQUAL( cd.contains, wxString(cd.hay).Contains(cd.needle) );
578 }
579 }
580
581 // flags used in ToLongData.flags
582 enum
583 {
584 Number_Ok = 0,
585 Number_Invalid = 1,
586 Number_Unsigned = 2, // if not specified, works for signed conversion
587 Number_Signed = 4, // if not specified, works for unsigned
588 Number_LongLong = 8, // only for long long tests
589 Number_Long = 16 // only for long tests
590 };
591
592 #ifdef wxLongLong_t
593 typedef wxLongLong_t TestValue_t;
594 #else
595 typedef long TestValue_t;
596 #endif
597
598 static const struct ToLongData
599 {
600 const wxChar *str;
601 TestValue_t value;
602 int flags;
603 int base;
604
LValueToLongData605 long LValue() const { return value; }
ULValueToLongData606 unsigned long ULValue() const { return value; }
607 #ifdef wxLongLong_t
LLValueToLongData608 wxLongLong_t LLValue() const { return value; }
ULLValueToLongData609 wxULongLong_t ULLValue() const { return (wxULongLong_t)value; }
610 #endif // wxLongLong_t
611
IsOkToLongData612 bool IsOk() const { return !(flags & Number_Invalid); }
613 } longData[] =
614 {
615 { wxT("1"), 1, Number_Ok },
616 { wxT("0"), 0, Number_Ok },
617 { wxT("a"), 0, Number_Invalid },
618 { wxT("12345"), 12345, Number_Ok },
619 { wxT("--1"), 0, Number_Invalid },
620
621 { wxT("-1"), -1, Number_Signed | Number_Long },
622 // this is surprising but consistent with strtoul() behaviour
623 { wxT("-1"), (TestValue_t)ULONG_MAX, Number_Unsigned | Number_Long },
624
625 // this must overflow, even with 64 bit long
626 { wxT("922337203685477580711"), 0, Number_Invalid },
627
628 #ifdef wxLongLong_t
629 { wxT("2147483648"), wxLL(2147483648), Number_LongLong },
630 { wxT("-2147483648"), wxLL(-2147483648), Number_LongLong | Number_Signed },
631 { wxT("9223372036854775808"),
632 TestValue_t(wxULL(9223372036854775808)),
633 Number_LongLong | Number_Unsigned },
634 #endif // wxLongLong_t
635
636 // Base tests.
637 { wxT("010"), 10, Number_Ok, 10 },
638 { wxT("010"), 8, Number_Ok, 0 },
639 { wxT("010"), 8, Number_Ok, 8 },
640 { wxT("010"), 16, Number_Ok, 16 },
641
642 { wxT("0010"), 10, Number_Ok, 10 },
643 { wxT("0010"), 8, Number_Ok, 0 },
644 { wxT("0010"), 8, Number_Ok, 8 },
645 { wxT("0010"), 16, Number_Ok, 16 },
646
647 { wxT("0x11"), 0, Number_Invalid, 10 },
648 { wxT("0x11"), 17, Number_Ok, 0 },
649 { wxT("0x11"), 0, Number_Invalid, 8 },
650 { wxT("0x11"), 17, Number_Ok, 16 },
651 };
652
ToLong()653 void StringTestCase::ToLong()
654 {
655 long l;
656 for ( size_t n = 0; n < WXSIZEOF(longData); n++ )
657 {
658 const ToLongData& ld = longData[n];
659
660 if ( ld.flags & (Number_LongLong | Number_Unsigned) )
661 continue;
662
663 // NOTE: unless you're using some exotic locale, ToCLong and ToLong
664 // should behave the same for our test data set:
665
666 CPPUNIT_ASSERT_EQUAL( ld.IsOk(),
667 wxString(ld.str).ToCLong(&l, ld.base) );
668 if ( ld.IsOk() )
669 CPPUNIT_ASSERT_EQUAL( ld.LValue(), l );
670
671 CPPUNIT_ASSERT_EQUAL( ld.IsOk(),
672 wxString(ld.str).ToLong(&l, ld.base) );
673 if ( ld.IsOk() )
674 CPPUNIT_ASSERT_EQUAL( ld.LValue(), l );
675 }
676
677 // special case: check that the output is not modified if the parsing
678 // failed completely
679 l = 17;
680 CPPUNIT_ASSERT( !wxString("foo").ToLong(&l) );
681 CPPUNIT_ASSERT_EQUAL( 17, l );
682
683 // also check that it is modified if we did parse something successfully in
684 // the beginning of the string
685 CPPUNIT_ASSERT( !wxString("9 cats").ToLong(&l) );
686 CPPUNIT_ASSERT_EQUAL( 9, l );
687 }
688
ToULong()689 void StringTestCase::ToULong()
690 {
691 unsigned long ul;
692 for ( size_t n = 0; n < WXSIZEOF(longData); n++ )
693 {
694 const ToLongData& ld = longData[n];
695
696 if ( ld.flags & (Number_LongLong | Number_Signed) )
697 continue;
698
699 // NOTE: unless you're using some exotic locale, ToCLong and ToLong
700 // should behave the same for our test data set:
701
702 CPPUNIT_ASSERT_EQUAL( ld.IsOk(),
703 wxString(ld.str).ToCULong(&ul, ld.base) );
704 if ( ld.IsOk() )
705 CPPUNIT_ASSERT_EQUAL( ld.ULValue(), ul );
706
707 CPPUNIT_ASSERT_EQUAL( ld.IsOk(),
708 wxString(ld.str).ToULong(&ul, ld.base) );
709 if ( ld.IsOk() )
710 CPPUNIT_ASSERT_EQUAL( ld.ULValue(), ul );
711 }
712 }
713
714 #ifdef wxLongLong_t
715
ToLongLong()716 void StringTestCase::ToLongLong()
717 {
718 wxLongLong_t l;
719 for ( size_t n = 0; n < WXSIZEOF(longData); n++ )
720 {
721 const ToLongData& ld = longData[n];
722
723 if ( ld.flags & (Number_Long | Number_Unsigned) )
724 continue;
725
726 CPPUNIT_ASSERT_EQUAL( ld.IsOk(),
727 wxString(ld.str).ToLongLong(&l, ld.base) );
728 if ( ld.IsOk() )
729 CPPUNIT_ASSERT_EQUAL( ld.LLValue(), l );
730 }
731 }
732
ToULongLong()733 void StringTestCase::ToULongLong()
734 {
735 wxULongLong_t ul;
736 for ( size_t n = 0; n < WXSIZEOF(longData); n++ )
737 {
738 const ToLongData& ld = longData[n];
739
740 if ( ld.flags & (Number_Long | Number_Signed) )
741 continue;
742
743 CPPUNIT_ASSERT_EQUAL( ld.IsOk(),
744 wxString(ld.str).ToULongLong(&ul, ld.base) );
745 if ( ld.IsOk() )
746 CPPUNIT_ASSERT_EQUAL( ld.ULLValue(), ul );
747 }
748 }
749
750 #endif // wxLongLong_t
751
ToDouble()752 void StringTestCase::ToDouble()
753 {
754 double d;
755 static const struct ToDoubleData
756 {
757 const wxChar *str;
758 double value;
759 bool ok;
760 } doubleData[] =
761 {
762 { wxT("1"), 1, true },
763 { wxT("1.23"), 1.23, true },
764 { wxT(".1"), .1, true },
765 { wxT("1."), 1, true },
766 { wxT("1.."), 0, false },
767 { wxT("0"), 0, true },
768 { wxT("a"), 0, false },
769 { wxT("12345"), 12345, true },
770 { wxT("-1"), -1, true },
771 { wxT("--1"), 0, false },
772 { wxT("-3E-5"), -3E-5, true },
773 { wxT("-3E-abcde5"), 0, false },
774 };
775
776 // test ToCDouble() first:
777
778 size_t n;
779 for ( n = 0; n < WXSIZEOF(doubleData); n++ )
780 {
781 const ToDoubleData& ld = doubleData[n];
782 CPPUNIT_ASSERT_EQUAL( ld.ok, wxString(ld.str).ToCDouble(&d) );
783 if ( ld.ok )
784 CPPUNIT_ASSERT_EQUAL( ld.value, d );
785 }
786
787
788 // test ToDouble() now:
789 // NOTE: for the test to be reliable, we need to set the locale explicitly
790 // so that we know the decimal point character to use
791
792 if (!wxLocale::IsAvailable(wxLANGUAGE_FRENCH))
793 return; // you should have french support installed to continue this test!
794
795 wxLocale locale;
796
797 // don't load default catalog, it may be unavailable:
798 CPPUNIT_ASSERT( locale.Init(wxLANGUAGE_FRENCH, wxLOCALE_DONT_LOAD_DEFAULT) );
799
800 static const struct ToDoubleData doubleData2[] =
801 {
802 { wxT("1"), 1, true },
803 { wxT("1,23"), 1.23, true },
804 { wxT(",1"), .1, true },
805 { wxT("1,"), 1, true },
806 { wxT("1,,"), 0, false },
807 { wxT("0"), 0, true },
808 { wxT("a"), 0, false },
809 { wxT("12345"), 12345, true },
810 { wxT("-1"), -1, true },
811 { wxT("--1"), 0, false },
812 { wxT("-3E-5"), -3E-5, true },
813 { wxT("-3E-abcde5"), 0, false },
814 };
815
816 for ( n = 0; n < WXSIZEOF(doubleData2); n++ )
817 {
818 const ToDoubleData& ld = doubleData2[n];
819 CPPUNIT_ASSERT_EQUAL( ld.ok, wxString(ld.str).ToDouble(&d) );
820 if ( ld.ok )
821 CPPUNIT_ASSERT_EQUAL( ld.value, d );
822 }
823 }
824
FromDouble()825 void StringTestCase::FromDouble()
826 {
827 static const struct FromDoubleTestData
828 {
829 double value;
830 int prec;
831 const char *str;
832 } testData[] =
833 {
834 { 1.23, -1, "1.23" },
835 // All MSVC versions until MSVC 14 used 3 digits for the exponent
836 // unnecessarily, account for this non-standard behaviour.
837 #if defined(wxUSING_VC_CRT_IO) && !wxCHECK_VISUALC_VERSION(14)
838 { -3e-10, -1, "-3e-010" },
839 #else
840 { -3e-10, -1, "-3e-10" },
841 #endif
842 { -0.45678, -1, "-0.45678" },
843 { 1.2345678, 0, "1" },
844 { 1.2345678, 1, "1.2" },
845 { 1.2345678, 2, "1.23" },
846 { 1.2345678, 3, "1.235" },
847 };
848
849 for ( unsigned n = 0; n < WXSIZEOF(testData); n++ )
850 {
851 const FromDoubleTestData& td = testData[n];
852 CPPUNIT_ASSERT_EQUAL( td.str, wxString::FromCDouble(td.value, td.prec) );
853 }
854
855 if ( !wxLocale::IsAvailable(wxLANGUAGE_FRENCH) )
856 return;
857
858 wxLocale locale;
859 CPPUNIT_ASSERT( locale.Init(wxLANGUAGE_FRENCH, wxLOCALE_DONT_LOAD_DEFAULT) );
860
861 for ( unsigned m = 0; m < WXSIZEOF(testData); m++ )
862 {
863 const FromDoubleTestData& td = testData[m];
864
865 wxString str(td.str);
866 str.Replace(".", ",");
867 CPPUNIT_ASSERT_EQUAL( str, wxString::FromDouble(td.value, td.prec) );
868 }
869 }
870
StringBuf()871 void StringTestCase::StringBuf()
872 {
873 // check that buffer can be used to write into the string
874 wxString s;
875 wxStrcpy(wxStringBuffer(s, 10), wxT("foo"));
876
877 CPPUNIT_ASSERT_EQUAL(3, s.length());
878 CPPUNIT_ASSERT(wxT('f') == s[0u]);
879 CPPUNIT_ASSERT(wxT('o') == s[1]);
880 CPPUNIT_ASSERT(wxT('o') == s[2]);
881
882 {
883 // also check that the buffer initially contains the original string
884 // contents
885 wxStringBuffer buf(s, 10);
886 CPPUNIT_ASSERT_EQUAL( wxT('f'), buf[0] );
887 CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[1] );
888 CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[2] );
889 CPPUNIT_ASSERT_EQUAL( wxT('\0'), buf[3] );
890 }
891
892 {
893 wxStringBufferLength buf(s, 10);
894 CPPUNIT_ASSERT_EQUAL( wxT('f'), buf[0] );
895 CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[1] );
896 CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[2] );
897 CPPUNIT_ASSERT_EQUAL( wxT('\0'), buf[3] );
898
899 // and check that it can be used to write only the specified number of
900 // characters to the string
901 wxStrcpy(buf, wxT("barrbaz"));
902 buf.SetLength(4);
903 }
904
905 CPPUNIT_ASSERT_EQUAL(4, s.length());
906 CPPUNIT_ASSERT(wxT('b') == s[0u]);
907 CPPUNIT_ASSERT(wxT('a') == s[1]);
908 CPPUNIT_ASSERT(wxT('r') == s[2]);
909 CPPUNIT_ASSERT(wxT('r') == s[3]);
910
911 // check that creating buffer of length smaller than string works, i.e. at
912 // least doesn't crash (it would if we naively copied the entire original
913 // string contents in the buffer)
914 *wxStringBuffer(s, 1) = '!';
915 }
916
UTF8Buf()917 void StringTestCase::UTF8Buf()
918 {
919 #if wxUSE_UNICODE
920 // "czech" in Czech ("cestina"):
921 static const char *textUTF8 = "\304\215e\305\241tina";
922 static const wchar_t textUTF16[] = {0x10D, 0x65, 0x161, 0x74, 0x69, 0x6E, 0x61, 0};
923
924 wxString s;
925 wxStrcpy(wxUTF8StringBuffer(s, 9), textUTF8);
926 CPPUNIT_ASSERT(s == textUTF16);
927
928 {
929 wxUTF8StringBufferLength buf(s, 20);
930 wxStrcpy(buf, textUTF8);
931 buf.SetLength(5);
932 }
933 CPPUNIT_ASSERT(s == wxString(textUTF16, 0, 3));
934 #endif // wxUSE_UNICODE
935 }
936
937
938
CStrDataTernaryOperator()939 void StringTestCase::CStrDataTernaryOperator()
940 {
941 DoCStrDataTernaryOperator(true);
942 DoCStrDataTernaryOperator(false);
943 }
944
CheckStr(const wxString & expected,T s)945 template<typename T> bool CheckStr(const wxString& expected, T s)
946 {
947 return expected == wxString(s);
948 }
949
DoCStrDataTernaryOperator(bool cond)950 void StringTestCase::DoCStrDataTernaryOperator(bool cond)
951 {
952 // test compilation of wxCStrData when used with operator?: (the asserts
953 // are not very important, we're testing if the code compiles at all):
954
955 wxString s("foo");
956
957 const wchar_t *wcStr = L"foo";
958 CPPUNIT_ASSERT( CheckStr(s, (cond ? s.c_str() : wcStr)) );
959 CPPUNIT_ASSERT( CheckStr(s, (cond ? s.c_str() : L"foo")) );
960 CPPUNIT_ASSERT( CheckStr(s, (cond ? wcStr : s.c_str())) );
961 CPPUNIT_ASSERT( CheckStr(s, (cond ? L"foo" : s.c_str())) );
962
963 const char *mbStr = "foo";
964 CPPUNIT_ASSERT( CheckStr(s, (cond ? s.c_str() : mbStr)) );
965 CPPUNIT_ASSERT( CheckStr(s, (cond ? s.c_str() : "foo")) );
966 CPPUNIT_ASSERT( CheckStr(s, (cond ? mbStr : s.c_str())) );
967 CPPUNIT_ASSERT( CheckStr(s, (cond ? "foo" : s.c_str())) );
968
969 wxString empty("");
970 CPPUNIT_ASSERT( CheckStr(empty, (cond ? empty.c_str() : wxEmptyString)) );
971 CPPUNIT_ASSERT( CheckStr(empty, (cond ? wxEmptyString : empty.c_str())) );
972 }
973
CStrDataOperators()974 void StringTestCase::CStrDataOperators()
975 {
976 wxString s("hello");
977
978 CPPUNIT_ASSERT( s.c_str()[0] == 'h' );
979 CPPUNIT_ASSERT( s.c_str()[1] == 'e' );
980
981 // IMPORTANT: at least with the CRT coming with MSVC++ 2008 trying to access
982 // the final character results in an assert failure (with debug CRT)
983 //CPPUNIT_ASSERT( s.c_str()[5] == '\0' );
984
985 CPPUNIT_ASSERT( *s.c_str() == 'h' );
986 CPPUNIT_ASSERT( *(s.c_str() + 2) == 'l' );
987 //CPPUNIT_ASSERT( *(s.c_str() + 5) == '\0' );
988 }
989
CheckStrChar(const wxString & expected,char * s)990 bool CheckStrChar(const wxString& expected, char *s)
991 { return CheckStr(expected, s); }
CheckStrWChar(const wxString & expected,wchar_t * s)992 bool CheckStrWChar(const wxString& expected, wchar_t *s)
993 { return CheckStr(expected, s); }
CheckStrConstChar(const wxString & expected,const char * s)994 bool CheckStrConstChar(const wxString& expected, const char *s)
995 { return CheckStr(expected, s); }
CheckStrConstWChar(const wxString & expected,const wchar_t * s)996 bool CheckStrConstWChar(const wxString& expected, const wchar_t *s)
997 { return CheckStr(expected, s); }
998
CStrDataImplicitConversion()999 void StringTestCase::CStrDataImplicitConversion()
1000 {
1001 wxString s("foo");
1002
1003 CPPUNIT_ASSERT( CheckStrConstWChar(s, s.c_str()) );
1004 CPPUNIT_ASSERT( CheckStrConstChar(s, s.c_str()) );
1005
1006 // implicit conversion of wxString is not available in STL build
1007 #if !wxUSE_STL
1008 CPPUNIT_ASSERT( CheckStrConstWChar(s, s) );
1009 CPPUNIT_ASSERT( CheckStrConstChar(s, s) );
1010 #endif
1011 }
1012
ExplicitConversion()1013 void StringTestCase::ExplicitConversion()
1014 {
1015 wxString s("foo");
1016
1017 CPPUNIT_ASSERT( CheckStr(s, s.mb_str()) );
1018 CPPUNIT_ASSERT( CheckStrConstChar(s, s.mb_str()) );
1019 CPPUNIT_ASSERT( CheckStrChar(s, s.char_str()) );
1020
1021 CPPUNIT_ASSERT( CheckStr(s, s.wc_str()) );
1022 CPPUNIT_ASSERT( CheckStrConstWChar(s, s.wc_str()) );
1023 CPPUNIT_ASSERT( CheckStrWChar(s, s.wchar_str()) );
1024 }
1025
IndexedAccess()1026 void StringTestCase::IndexedAccess()
1027 {
1028 wxString s("bar");
1029 CPPUNIT_ASSERT_EQUAL( 'r', (char)s[2] );
1030
1031 // this tests for a possible bug in UTF-8 based wxString implementation:
1032 // the 3rd character of the underlying byte string is going to change, but
1033 // the 3rd character of wxString should remain the same
1034 s[0] = L'\xe9';
1035 CPPUNIT_ASSERT_EQUAL( 'r', (char)s[2] );
1036 }
1037
BeforeAndAfter()1038 void StringTestCase::BeforeAndAfter()
1039 {
1040 // Construct a string with 2 equal signs in it by concatenating its three
1041 // parts: before the first "=", in between the two "="s and after the last
1042 // one. This allows to avoid duplicating the string contents (which has to
1043 // be different for Unicode and ANSI builds) in the tests below.
1044 #if wxUSE_UNICODE
1045 #define FIRST_PART L"letter"
1046 #define MIDDLE_PART L"\xe9;\xe7a"
1047 #define LAST_PART L"l\xe0"
1048 #else // !wxUSE_UNICODE
1049 #define FIRST_PART "letter"
1050 #define MIDDLE_PART "e;ca"
1051 #define LAST_PART "la"
1052 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
1053
1054 const wxString s(FIRST_PART wxT("=") MIDDLE_PART wxT("=") LAST_PART);
1055
1056 wxString r;
1057
1058 CPPUNIT_ASSERT_EQUAL( FIRST_PART, s.BeforeFirst('=', &r) );
1059 CPPUNIT_ASSERT_EQUAL( MIDDLE_PART wxT("=") LAST_PART, r );
1060
1061 CPPUNIT_ASSERT_EQUAL( s, s.BeforeFirst('!', &r) );
1062 CPPUNIT_ASSERT_EQUAL( "", r );
1063
1064
1065 CPPUNIT_ASSERT_EQUAL( FIRST_PART wxT("=") MIDDLE_PART, s.BeforeLast('=', &r) );
1066 CPPUNIT_ASSERT_EQUAL( LAST_PART, r );
1067
1068 CPPUNIT_ASSERT_EQUAL( "", s.BeforeLast('!', &r) );
1069 CPPUNIT_ASSERT_EQUAL( s, r );
1070
1071
1072 CPPUNIT_ASSERT_EQUAL( MIDDLE_PART wxT("=") LAST_PART, s.AfterFirst('=') );
1073 CPPUNIT_ASSERT_EQUAL( "", s.AfterFirst('!') );
1074
1075
1076 CPPUNIT_ASSERT_EQUAL( LAST_PART, s.AfterLast('=') );
1077 CPPUNIT_ASSERT_EQUAL( s, s.AfterLast('!') );
1078
1079 #undef LAST_PART
1080 #undef MIDDLE_PART
1081 #undef FIRST_PART
1082 }
1083
ScopedBuffers()1084 void StringTestCase::ScopedBuffers()
1085 {
1086 // wxString relies on efficient buffers, verify they work as they should
1087
1088 const char *literal = "Hello World!";
1089
1090 // non-owned buffer points to the string passed to it
1091 wxScopedCharBuffer sbuf = wxScopedCharBuffer::CreateNonOwned(literal);
1092 CPPUNIT_ASSERT( sbuf.data() == literal );
1093
1094 // a copy of scoped non-owned buffer still points to the same string
1095 wxScopedCharBuffer sbuf2(sbuf);
1096 CPPUNIT_ASSERT( sbuf.data() == sbuf2.data() );
1097
1098 // but assigning it to wxCharBuffer makes a full copy
1099 wxCharBuffer buf(sbuf);
1100 CPPUNIT_ASSERT( buf.data() != literal );
1101 CPPUNIT_ASSERT_EQUAL( literal, buf.data() );
1102
1103 wxCharBuffer buf2 = sbuf;
1104 CPPUNIT_ASSERT( buf2.data() != literal );
1105 CPPUNIT_ASSERT_EQUAL( literal, buf.data() );
1106
1107 // Check that extending the buffer keeps it NUL-terminated.
1108 size_t len = 10;
1109
1110 wxCharBuffer buf3(len);
1111 CPPUNIT_ASSERT_EQUAL('\0', buf3.data()[len]);
1112
1113 wxCharBuffer buf4;
1114 buf4.extend(len);
1115 CPPUNIT_ASSERT_EQUAL('\0', buf4.data()[len]);
1116
1117 wxCharBuffer buf5(5);
1118 buf5.extend(len);
1119 CPPUNIT_ASSERT_EQUAL('\0', buf5.data()[len]);
1120 }
1121