base/string_piece_unittest.cc

   1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6
   7 #include "base/string_piece.h"
   8
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 using namespace base;
  12
  13 TEST(StringPieceTest, CheckComparisonOperators) {
  14 #define CMP_Y(op, x, y)                                               \
  15   ASSERT_TRUE( (StringPiece((x)) op StringPiece((y))));               \
  16   ASSERT_TRUE( (StringPiece((x)).compare(StringPiece((y))) op 0))
  17
  18 #define CMP_N(op, x, y)                                          \
  19   ASSERT_FALSE(StringPiece((x)) op StringPiece((y)));               \
  20   ASSERT_FALSE(StringPiece((x)).compare(StringPiece((y))) op 0)
  21
  22   CMP_Y(==, "",   "");
  23   CMP_Y(==, "a",  "a");
  24   CMP_Y(==, "aa", "aa");
  25   CMP_N(==, "a",  "");
  26   CMP_N(==, "",   "a");
  27   CMP_N(==, "a",  "b");
  28   CMP_N(==, "a",  "aa");
  29   CMP_N(==, "aa", "a");
  30
  31   CMP_N(!=, "",   "");
  32   CMP_N(!=, "a",  "a");
  33   CMP_N(!=, "aa", "aa");
  34   CMP_Y(!=, "a",  "");
  35   CMP_Y(!=, "",   "a");
  36   CMP_Y(!=, "a",  "b");
  37   CMP_Y(!=, "a",  "aa");
  38   CMP_Y(!=, "aa", "a");
  39
  40   CMP_Y(<, "a",  "b");
  41   CMP_Y(<, "a",  "aa");
  42   CMP_Y(<, "aa", "b");
  43   CMP_Y(<, "aa", "bb");
  44   CMP_N(<, "a",  "a");
  45   CMP_N(<, "b",  "a");
  46   CMP_N(<, "aa", "a");
  47   CMP_N(<, "b",  "aa");
  48   CMP_N(<, "bb", "aa");
  49
  50   CMP_Y(<=, "a",  "a");
  51   CMP_Y(<=, "a",  "b");
  52   CMP_Y(<=, "a",  "aa");
  53   CMP_Y(<=, "aa", "b");
  54   CMP_Y(<=, "aa", "bb");
  55   CMP_N(<=, "b",  "a");
  56   CMP_N(<=, "aa", "a");
  57   CMP_N(<=, "b",  "aa");
  58   CMP_N(<=, "bb", "aa");
  59
  60   CMP_N(>=, "a",  "b");
  61   CMP_N(>=, "a",  "aa");
  62   CMP_N(>=, "aa", "b");
  63   CMP_N(>=, "aa", "bb");
  64   CMP_Y(>=, "a",  "a");
  65   CMP_Y(>=, "b",  "a");
  66   CMP_Y(>=, "aa", "a");
  67   CMP_Y(>=, "b",  "aa");
  68   CMP_Y(>=, "bb", "aa");
  69
  70   CMP_N(>, "a",  "a");
  71   CMP_N(>, "a",  "b");
  72   CMP_N(>, "a",  "aa");
  73   CMP_N(>, "aa", "b");
  74   CMP_N(>, "aa", "bb");
  75   CMP_Y(>, "b",  "a");
  76   CMP_Y(>, "aa", "a");
  77   CMP_Y(>, "b",  "aa");
  78   CMP_Y(>, "bb", "aa");
  79
  80   std::string x;
  81   for (int i = 0; i < 256; i++) {
  82     x += 'a';
  83     std::string y = x;
  84     CMP_Y(==, x, y);
  85     for (int j = 0; j < i; j++) {
  86       std::string z = x;
  87       z[j] = 'b';       // Differs in position 'j'
  88       CMP_N(==, x, z);
  89     }
  90   }
  91
  92 #undef CMP_Y
  93 #undef CMP_N
  94 }
  95
  96 TEST(StringPieceTest, CheckSTL) {
  97   StringPiece a("abcdefghijklmnopqrstuvwxyz");
  98   StringPiece b("abc");
  99   StringPiece c("xyz");
 100   StringPiece d("foobar");
 101   StringPiece e;
 102   std::string temp("123");
 103   temp += '\0';
 104   temp += "456";
 105   StringPiece f(temp);
 106
 107   ASSERT_EQ(a[6], 'g');
 108   ASSERT_EQ(b[0], 'a');
 109   ASSERT_EQ(c[2], 'z');
 110   ASSERT_EQ(f[3], '\0');
 111   ASSERT_EQ(f[5], '5');
 112
 113   ASSERT_EQ(*d.data(), 'f');
 114   ASSERT_EQ(d.data()[5], 'r');
 115   ASSERT_TRUE(e.data() == NULL);
 116
 117   ASSERT_EQ(*a.begin(), 'a');
 118   ASSERT_EQ(*(b.begin() + 2), 'c');
 119   ASSERT_EQ(*(c.end() - 1), 'z');
 120
 121   ASSERT_EQ(*a.rbegin(), 'z');
 122   ASSERT_EQ(*(b.rbegin() + 2), 'a');
 123   ASSERT_EQ(*(c.rend() - 1), 'x');
 124   ASSERT_TRUE(a.rbegin() + 26 == a.rend());
 125
 126   ASSERT_EQ(a.size(), 26U);
 127   ASSERT_EQ(b.size(), 3U);
 128   ASSERT_EQ(c.size(), 3U);
 129   ASSERT_EQ(d.size(), 6U);
 130   ASSERT_EQ(e.size(), 0U);
 131   ASSERT_EQ(f.size(), 7U);
 132
 133   ASSERT_TRUE(!d.empty());
 134   ASSERT_TRUE(d.begin() != d.end());
 135   ASSERT_TRUE(d.begin() + 6 == d.end());
 136
 137   ASSERT_TRUE(e.empty());
 138   ASSERT_TRUE(e.begin() == e.end());
 139
 140   d.clear();
 141   ASSERT_EQ(d.size(), 0U);
 142   ASSERT_TRUE(d.empty());
 143   ASSERT_TRUE(d.data() == NULL);
 144   ASSERT_TRUE(d.begin() == d.end());
 145
 146   ASSERT_GE(a.max_size(), a.capacity());
 147   ASSERT_GE(a.capacity(), a.size());
 148
 149   char buf[4] = { '%', '%', '%', '%' };
 150   ASSERT_EQ(a.copy(buf, 4), 4U);
 151   ASSERT_EQ(buf[0], a[0]);
 152   ASSERT_EQ(buf[1], a[1]);
 153   ASSERT_EQ(buf[2], a[2]);
 154   ASSERT_EQ(buf[3], a[3]);
 155   ASSERT_EQ(a.copy(buf, 3, 7), 3U);
 156   ASSERT_EQ(buf[0], a[7]);
 157   ASSERT_EQ(buf[1], a[8]);
 158   ASSERT_EQ(buf[2], a[9]);
 159   ASSERT_EQ(buf[3], a[3]);
 160   ASSERT_EQ(c.copy(buf, 99), 3U);
 161   ASSERT_EQ(buf[0], c[0]);
 162   ASSERT_EQ(buf[1], c[1]);
 163   ASSERT_EQ(buf[2], c[2]);
 164   ASSERT_EQ(buf[3], a[3]);
 165
 166   ASSERT_EQ(StringPiece::npos, std::string::npos);
 167
 168   ASSERT_EQ(a.find(b), 0U);
 169   ASSERT_EQ(a.find(b, 1), StringPiece::npos);
 170   ASSERT_EQ(a.find(c), 23U);
 171   ASSERT_EQ(a.find(c, 9), 23U);
 172   ASSERT_EQ(a.find(c, StringPiece::npos), StringPiece::npos);
 173   ASSERT_EQ(b.find(c), StringPiece::npos);
 174   ASSERT_EQ(b.find(c, StringPiece::npos), StringPiece::npos);
 175   ASSERT_EQ(a.find(d), 0U);
 176   ASSERT_EQ(a.find(e), 0U);
 177   ASSERT_EQ(a.find(d, 12), 12U);
 178   ASSERT_EQ(a.find(e, 17), 17U);
 179   StringPiece g("xx not found bb");
 180   ASSERT_EQ(a.find(g), StringPiece::npos);
 181   // empty string nonsense
 182   ASSERT_EQ(d.find(b), StringPiece::npos);
 183   ASSERT_EQ(e.find(b), StringPiece::npos);
 184   ASSERT_EQ(d.find(b, 4), StringPiece::npos);
 185   ASSERT_EQ(e.find(b, 7), StringPiece::npos);
 186
 187   size_t empty_search_pos = std::string().find(std::string());
 188   ASSERT_EQ(d.find(d), empty_search_pos);
 189   ASSERT_EQ(d.find(e), empty_search_pos);
 190   ASSERT_EQ(e.find(d), empty_search_pos);
 191   ASSERT_EQ(e.find(e), empty_search_pos);
 192   ASSERT_EQ(d.find(d, 4), std::string().find(std::string(), 4));
 193   ASSERT_EQ(d.find(e, 4), std::string().find(std::string(), 4));
 194   ASSERT_EQ(e.find(d, 4), std::string().find(std::string(), 4));
 195   ASSERT_EQ(e.find(e, 4), std::string().find(std::string(), 4));
 196
 197   ASSERT_EQ(a.find('a'), 0U);
 198   ASSERT_EQ(a.find('c'), 2U);
 199   ASSERT_EQ(a.find('z'), 25U);
 200   ASSERT_EQ(a.find('$'), StringPiece::npos);
 201   ASSERT_EQ(a.find('\0'), StringPiece::npos);
 202   ASSERT_EQ(f.find('\0'), 3U);
 203   ASSERT_EQ(f.find('3'), 2U);
 204   ASSERT_EQ(f.find('5'), 5U);
 205   ASSERT_EQ(g.find('o'), 4U);
 206   ASSERT_EQ(g.find('o', 4), 4U);
 207   ASSERT_EQ(g.find('o', 5), 8U);
 208   ASSERT_EQ(a.find('b', 5), StringPiece::npos);
 209   // empty string nonsense
 210   ASSERT_EQ(d.find('\0'), StringPiece::npos);
 211   ASSERT_EQ(e.find('\0'), StringPiece::npos);
 212   ASSERT_EQ(d.find('\0', 4), StringPiece::npos);
 213   ASSERT_EQ(e.find('\0', 7), StringPiece::npos);
 214   ASSERT_EQ(d.find('x'), StringPiece::npos);
 215   ASSERT_EQ(e.find('x'), StringPiece::npos);
 216   ASSERT_EQ(d.find('x', 4), StringPiece::npos);
 217   ASSERT_EQ(e.find('x', 7), StringPiece::npos);
 218
 219   ASSERT_EQ(a.rfind(b), 0U);
 220   ASSERT_EQ(a.rfind(b, 1), 0U);
 221   ASSERT_EQ(a.rfind(c), 23U);
 222   ASSERT_EQ(a.rfind(c, 22U), StringPiece::npos);
 223   ASSERT_EQ(a.rfind(c, 1U), StringPiece::npos);
 224   ASSERT_EQ(a.rfind(c, 0U), StringPiece::npos);
 225   ASSERT_EQ(b.rfind(c), StringPiece::npos);
 226   ASSERT_EQ(b.rfind(c, 0U), StringPiece::npos);
 227   ASSERT_EQ(a.rfind(d), (size_t) a.as_string().rfind(std::string()));
 228   ASSERT_EQ(a.rfind(e), a.as_string().rfind(std::string()));
 229   ASSERT_EQ(a.rfind(d, 12), 12U);
 230   ASSERT_EQ(a.rfind(e, 17), 17U);
 231   ASSERT_EQ(a.rfind(g), StringPiece::npos);
 232   ASSERT_EQ(d.rfind(b), StringPiece::npos);
 233   ASSERT_EQ(e.rfind(b), StringPiece::npos);
 234   ASSERT_EQ(d.rfind(b, 4), StringPiece::npos);
 235   ASSERT_EQ(e.rfind(b, 7), StringPiece::npos);
 236   // empty string nonsense
 237   ASSERT_EQ(d.rfind(d, 4), std::string().rfind(std::string()));
 238   ASSERT_EQ(e.rfind(d, 7), std::string().rfind(std::string()));
 239   ASSERT_EQ(d.rfind(e, 4), std::string().rfind(std::string()));
 240   ASSERT_EQ(e.rfind(e, 7), std::string().rfind(std::string()));
 241   ASSERT_EQ(d.rfind(d), std::string().rfind(std::string()));
 242   ASSERT_EQ(e.rfind(d), std::string().rfind(std::string()));
 243   ASSERT_EQ(d.rfind(e), std::string().rfind(std::string()));
 244   ASSERT_EQ(e.rfind(e), std::string().rfind(std::string()));
 245
 246   ASSERT_EQ(g.rfind('o'), 8U);
 247   ASSERT_EQ(g.rfind('q'), StringPiece::npos);
 248   ASSERT_EQ(g.rfind('o', 8), 8U);
 249   ASSERT_EQ(g.rfind('o', 7), 4U);
 250   ASSERT_EQ(g.rfind('o', 3), StringPiece::npos);
 251   ASSERT_EQ(f.rfind('\0'), 3U);
 252   ASSERT_EQ(f.rfind('\0', 12), 3U);
 253   ASSERT_EQ(f.rfind('3'), 2U);
 254   ASSERT_EQ(f.rfind('5'), 5U);
 255   // empty string nonsense
 256   ASSERT_EQ(d.rfind('o'), StringPiece::npos);
 257   ASSERT_EQ(e.rfind('o'), StringPiece::npos);
 258   ASSERT_EQ(d.rfind('o', 4), StringPiece::npos);
 259   ASSERT_EQ(e.rfind('o', 7), StringPiece::npos);
 260
 261   ASSERT_EQ(a.find_first_of(b), 0U);
 262   ASSERT_EQ(a.find_first_of(b, 0), 0U);
 263   ASSERT_EQ(a.find_first_of(b, 1), 1U);
 264   ASSERT_EQ(a.find_first_of(b, 2), 2U);
 265   ASSERT_EQ(a.find_first_of(b, 3), StringPiece::npos);
 266   ASSERT_EQ(a.find_first_of(c), 23U);
 267   ASSERT_EQ(a.find_first_of(c, 23), 23U);
 268   ASSERT_EQ(a.find_first_of(c, 24), 24U);
 269   ASSERT_EQ(a.find_first_of(c, 25), 25U);
 270   ASSERT_EQ(a.find_first_of(c, 26), StringPiece::npos);
 271   ASSERT_EQ(g.find_first_of(b), 13U);
 272   ASSERT_EQ(g.find_first_of(c), 0U);
 273   ASSERT_EQ(a.find_first_of(f), StringPiece::npos);
 274   ASSERT_EQ(f.find_first_of(a), StringPiece::npos);
 275   // empty string nonsense
 276   ASSERT_EQ(a.find_first_of(d), StringPiece::npos);
 277   ASSERT_EQ(a.find_first_of(e), StringPiece::npos);
 278   ASSERT_EQ(d.find_first_of(b), StringPiece::npos);
 279   ASSERT_EQ(e.find_first_of(b), StringPiece::npos);
 280   ASSERT_EQ(d.find_first_of(d), StringPiece::npos);
 281   ASSERT_EQ(e.find_first_of(d), StringPiece::npos);
 282   ASSERT_EQ(d.find_first_of(e), StringPiece::npos);
 283   ASSERT_EQ(e.find_first_of(e), StringPiece::npos);
 284
 285   ASSERT_EQ(a.find_first_not_of(b), 3U);
 286   ASSERT_EQ(a.find_first_not_of(c), 0U);
 287   ASSERT_EQ(b.find_first_not_of(a), StringPiece::npos);
 288   ASSERT_EQ(c.find_first_not_of(a), StringPiece::npos);
 289   ASSERT_EQ(f.find_first_not_of(a), 0U);
 290   ASSERT_EQ(a.find_first_not_of(f), 0U);
 291   ASSERT_EQ(a.find_first_not_of(d), 0U);
 292   ASSERT_EQ(a.find_first_not_of(e), 0U);
 293   // empty string nonsense
 294   ASSERT_EQ(d.find_first_not_of(a), StringPiece::npos);
 295   ASSERT_EQ(e.find_first_not_of(a), StringPiece::npos);
 296   ASSERT_EQ(d.find_first_not_of(d), StringPiece::npos);
 297   ASSERT_EQ(e.find_first_not_of(d), StringPiece::npos);
 298   ASSERT_EQ(d.find_first_not_of(e), StringPiece::npos);
 299   ASSERT_EQ(e.find_first_not_of(e), StringPiece::npos);
 300
 301   StringPiece h("====");
 302   ASSERT_EQ(h.find_first_not_of('='), StringPiece::npos);
 303   ASSERT_EQ(h.find_first_not_of('=', 3), StringPiece::npos);
 304   ASSERT_EQ(h.find_first_not_of('\0'), 0U);
 305   ASSERT_EQ(g.find_first_not_of('x'), 2U);
 306   ASSERT_EQ(f.find_first_not_of('\0'), 0U);
 307   ASSERT_EQ(f.find_first_not_of('\0', 3), 4U);
 308   ASSERT_EQ(f.find_first_not_of('\0', 2), 2U);
 309   // empty string nonsense
 310   ASSERT_EQ(d.find_first_not_of('x'), StringPiece::npos);
 311   ASSERT_EQ(e.find_first_not_of('x'), StringPiece::npos);
 312   ASSERT_EQ(d.find_first_not_of('\0'), StringPiece::npos);
 313   ASSERT_EQ(e.find_first_not_of('\0'), StringPiece::npos);
 314
 315   //  StringPiece g("xx not found bb");
 316   StringPiece i("56");
 317   ASSERT_EQ(h.find_last_of(a), StringPiece::npos);
 318   ASSERT_EQ(g.find_last_of(a), g.size()-1);
 319   ASSERT_EQ(a.find_last_of(b), 2U);
 320   ASSERT_EQ(a.find_last_of(c), a.size()-1);
 321   ASSERT_EQ(f.find_last_of(i), 6U);
 322   ASSERT_EQ(a.find_last_of('a'), 0U);
 323   ASSERT_EQ(a.find_last_of('b'), 1U);
 324   ASSERT_EQ(a.find_last_of('z'), 25U);
 325   ASSERT_EQ(a.find_last_of('a', 5), 0U);
 326   ASSERT_EQ(a.find_last_of('b', 5), 1U);
 327   ASSERT_EQ(a.find_last_of('b', 0), StringPiece::npos);
 328   ASSERT_EQ(a.find_last_of('z', 25), 25U);
 329   ASSERT_EQ(a.find_last_of('z', 24), StringPiece::npos);
 330   ASSERT_EQ(f.find_last_of(i, 5), 5U);
 331   ASSERT_EQ(f.find_last_of(i, 6), 6U);
 332   ASSERT_EQ(f.find_last_of(a, 4), StringPiece::npos);
 333   // empty string nonsense
 334   ASSERT_EQ(f.find_last_of(d), StringPiece::npos);
 335   ASSERT_EQ(f.find_last_of(e), StringPiece::npos);
 336   ASSERT_EQ(f.find_last_of(d, 4), StringPiece::npos);
 337   ASSERT_EQ(f.find_last_of(e, 4), StringPiece::npos);
 338   ASSERT_EQ(d.find_last_of(d), StringPiece::npos);
 339   ASSERT_EQ(d.find_last_of(e), StringPiece::npos);
 340   ASSERT_EQ(e.find_last_of(d), StringPiece::npos);
 341   ASSERT_EQ(e.find_last_of(e), StringPiece::npos);
 342   ASSERT_EQ(d.find_last_of(f), StringPiece::npos);
 343   ASSERT_EQ(e.find_last_of(f), StringPiece::npos);
 344   ASSERT_EQ(d.find_last_of(d, 4), StringPiece::npos);
 345   ASSERT_EQ(d.find_last_of(e, 4), StringPiece::npos);
 346   ASSERT_EQ(e.find_last_of(d, 4), StringPiece::npos);
 347   ASSERT_EQ(e.find_last_of(e, 4), StringPiece::npos);
 348   ASSERT_EQ(d.find_last_of(f, 4), StringPiece::npos);
 349   ASSERT_EQ(e.find_last_of(f, 4), StringPiece::npos);
 350
 351   ASSERT_EQ(a.find_last_not_of(b), a.size()-1);
 352   ASSERT_EQ(a.find_last_not_of(c), 22U);
 353   ASSERT_EQ(b.find_last_not_of(a), StringPiece::npos);
 354   ASSERT_EQ(b.find_last_not_of(b), StringPiece::npos);
 355   ASSERT_EQ(f.find_last_not_of(i), 4U);
 356   ASSERT_EQ(a.find_last_not_of(c, 24), 22U);
 357   ASSERT_EQ(a.find_last_not_of(b, 3), 3U);
 358   ASSERT_EQ(a.find_last_not_of(b, 2), StringPiece::npos);
 359   // empty string nonsense
 360   ASSERT_EQ(f.find_last_not_of(d), f.size()-1);
 361   ASSERT_EQ(f.find_last_not_of(e), f.size()-1);
 362   ASSERT_EQ(f.find_last_not_of(d, 4), 4U);
 363   ASSERT_EQ(f.find_last_not_of(e, 4), 4U);
 364   ASSERT_EQ(d.find_last_not_of(d), StringPiece::npos);
 365   ASSERT_EQ(d.find_last_not_of(e), StringPiece::npos);
 366   ASSERT_EQ(e.find_last_not_of(d), StringPiece::npos);
 367   ASSERT_EQ(e.find_last_not_of(e), StringPiece::npos);
 368   ASSERT_EQ(d.find_last_not_of(f), StringPiece::npos);
 369   ASSERT_EQ(e.find_last_not_of(f), StringPiece::npos);
 370   ASSERT_EQ(d.find_last_not_of(d, 4), StringPiece::npos);
 371   ASSERT_EQ(d.find_last_not_of(e, 4), StringPiece::npos);
 372   ASSERT_EQ(e.find_last_not_of(d, 4), StringPiece::npos);
 373   ASSERT_EQ(e.find_last_not_of(e, 4), StringPiece::npos);
 374   ASSERT_EQ(d.find_last_not_of(f, 4), StringPiece::npos);
 375   ASSERT_EQ(e.find_last_not_of(f, 4), StringPiece::npos);
 376
 377   ASSERT_EQ(h.find_last_not_of('x'), h.size() - 1);
 378   ASSERT_EQ(h.find_last_not_of('='), StringPiece::npos);
 379   ASSERT_EQ(b.find_last_not_of('c'), 1U);
 380   ASSERT_EQ(h.find_last_not_of('x', 2), 2U);
 381   ASSERT_EQ(h.find_last_not_of('=', 2), StringPiece::npos);
 382   ASSERT_EQ(b.find_last_not_of('b', 1), 0U);
 383   // empty string nonsense
 384   ASSERT_EQ(d.find_last_not_of('x'), StringPiece::npos);
 385   ASSERT_EQ(e.find_last_not_of('x'), StringPiece::npos);
 386   ASSERT_EQ(d.find_last_not_of('\0'), StringPiece::npos);
 387   ASSERT_EQ(e.find_last_not_of('\0'), StringPiece::npos);
 388
 389   ASSERT_EQ(a.substr(0, 3), b);
 390   ASSERT_EQ(a.substr(23), c);
 391   ASSERT_EQ(a.substr(23, 3), c);
 392   ASSERT_EQ(a.substr(23, 99), c);
 393   ASSERT_EQ(a.substr(0), a);
 394   ASSERT_EQ(a.substr(3, 2), "de");
 395   // empty string nonsense
 396   ASSERT_EQ(a.substr(99, 2), e);
 397   ASSERT_EQ(d.substr(99), e);
 398   ASSERT_EQ(d.substr(0, 99), e);
 399   ASSERT_EQ(d.substr(99, 99), e);
 400 }
 401
 402 TEST(StringPieceTest, CheckCustom) {
 403   StringPiece a("foobar");
 404   std::string s1("123");
 405   s1 += '\0';
 406   s1 += "456";
 407   StringPiece b(s1);
 408   StringPiece e;
 409   std::string s2;
 410
 411   // CopyToString
 412   a.CopyToString(&s2);
 413   ASSERT_EQ(s2.size(), 6U);
 414   ASSERT_EQ(s2, "foobar");
 415   b.CopyToString(&s2);
 416   ASSERT_EQ(s2.size(), 7U);
 417   ASSERT_EQ(s1, s2);
 418   e.CopyToString(&s2);
 419   ASSERT_TRUE(s2.empty());
 420
 421   // AppendToString
 422   s2.erase();
 423   a.AppendToString(&s2);
 424   ASSERT_EQ(s2.size(), 6U);
 425   ASSERT_EQ(s2, "foobar");
 426   a.AppendToString(&s2);
 427   ASSERT_EQ(s2.size(), 12U);
 428   ASSERT_EQ(s2, "foobarfoobar");
 429
 430   // starts_with
 431   ASSERT_TRUE(a.starts_with(a));
 432   ASSERT_TRUE(a.starts_with("foo"));
 433   ASSERT_TRUE(a.starts_with(e));
 434   ASSERT_TRUE(b.starts_with(s1));
 435   ASSERT_TRUE(b.starts_with(b));
 436   ASSERT_TRUE(b.starts_with(e));
 437   ASSERT_TRUE(e.starts_with(""));
 438   ASSERT_TRUE(!a.starts_with(b));
 439   ASSERT_TRUE(!b.starts_with(a));
 440   ASSERT_TRUE(!e.starts_with(a));
 441
 442   // ends with
 443   ASSERT_TRUE(a.ends_with(a));
 444   ASSERT_TRUE(a.ends_with("bar"));
 445   ASSERT_TRUE(a.ends_with(e));
 446   ASSERT_TRUE(b.ends_with(s1));
 447   ASSERT_TRUE(b.ends_with(b));
 448   ASSERT_TRUE(b.ends_with(e));
 449   ASSERT_TRUE(e.ends_with(""));
 450   ASSERT_TRUE(!a.ends_with(b));
 451   ASSERT_TRUE(!b.ends_with(a));
 452   ASSERT_TRUE(!e.ends_with(a));
 453
 454   // remove_prefix
 455   StringPiece c(a);
 456   c.remove_prefix(3);
 457   ASSERT_EQ(c, "bar");
 458   c = a;
 459   c.remove_prefix(0);
 460   ASSERT_EQ(c, a);
 461   c.remove_prefix(c.size());
 462   ASSERT_EQ(c, e);
 463
 464   // remove_suffix
 465   c = a;
 466   c.remove_suffix(3);
 467   ASSERT_EQ(c, "foo");
 468   c = a;
 469   c.remove_suffix(0);
 470   ASSERT_EQ(c, a);
 471   c.remove_suffix(c.size());
 472   ASSERT_EQ(c, e);
 473
 474   // set
 475   c.set("foobar", 6);
 476   ASSERT_EQ(c, a);
 477   c.set("foobar", 0);
 478   ASSERT_EQ(c, e);
 479   c.set("foobar", 7);
 480   ASSERT_NE(c, a);
 481
 482   c.set("foobar");
 483   ASSERT_EQ(c, a);
 484
 485   c.set(static_cast<const void*>("foobar"), 6);
 486   ASSERT_EQ(c, a);
 487   c.set(static_cast<const void*>("foobar"), 0);
 488   ASSERT_EQ(c, e);
 489   c.set(static_cast<const void*>("foobar"), 7);
 490   ASSERT_NE(c, a);
 491
 492   // as_string
 493   std::string s3(a.as_string().c_str(), 7);
 494   ASSERT_EQ(c, s3);
 495   std::string s4(e.as_string());
 496   ASSERT_TRUE(s4.empty());
 497 }
 498
 499 TEST(StringPieceTest, CheckNULL) {
 500   // we used to crash here, but now we don't.
 501   StringPiece s(NULL);
 502   ASSERT_EQ(s.data(), (const char*)NULL);
 503   ASSERT_EQ(s.size(), 0U);
 504
 505   s.set(NULL);
 506   ASSERT_EQ(s.data(), (const char*)NULL);
 507   ASSERT_EQ(s.size(), 0U);
 508 }
 509
 510 TEST(StringPieceTest, CheckComparisons2) {
 511   StringPiece abc("abcdefghijklmnopqrstuvwxyz");
 512
 513   // check comparison operations on strings longer than 4 bytes.
 514   ASSERT_TRUE(abc == StringPiece("abcdefghijklmnopqrstuvwxyz"));
 515   ASSERT_TRUE(abc.compare(StringPiece("abcdefghijklmnopqrstuvwxyz")) == 0);
 516
 517   ASSERT_TRUE(abc < StringPiece("abcdefghijklmnopqrstuvwxzz"));
 518   ASSERT_TRUE(abc.compare(StringPiece("abcdefghijklmnopqrstuvwxzz")) < 0);
 519
 520   ASSERT_TRUE(abc > StringPiece("abcdefghijklmnopqrstuvwxyy"));
 521   ASSERT_TRUE(abc.compare(StringPiece("abcdefghijklmnopqrstuvwxyy")) > 0);
 522
 523   // starts_with
 524   ASSERT_TRUE(abc.starts_with(abc));
 525   ASSERT_TRUE(abc.starts_with("abcdefghijklm"));
 526   ASSERT_TRUE(!abc.starts_with("abcdefguvwxyz"));
 527
 528   // ends_with
 529   ASSERT_TRUE(abc.ends_with(abc));
 530   ASSERT_TRUE(!abc.ends_with("abcdefguvwxyz"));
 531   ASSERT_TRUE(abc.ends_with("nopqrstuvwxyz"));
 532 }
 533
 534 TEST(StringPieceTest, StringCompareNotAmbiguous) {
 535   ASSERT_TRUE("hello" == std::string("hello"));
 536   ASSERT_TRUE("hello" < std::string("world"));
 537 }
 538
 539 TEST(StringPieceTest, HeterogenousStringPieceEquals) {
 540   ASSERT_TRUE(StringPiece("hello") == std::string("hello"));
 541   ASSERT_TRUE("hello" == StringPiece("hello"));
 542 }