unittests/ADT/StringRefTest.cpp

   1 //===- llvm/unittest/ADT/StringRefTest.cpp - StringRef unit tests ---------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/ADT/StringRef.h"
  11 #include "llvm/ADT/StringExtras.h"
  12 #include "llvm/ADT/Hashing.h"
  13 #include "llvm/ADT/SmallVector.h"
  14 #include "llvm/Support/raw_ostream.h"
  15 #include "gtest/gtest.h"
  16 using namespace llvm;
  17
  18 namespace llvm {
  19
  20 std::ostream &operator<<(std::ostream &OS, const StringRef &S) {
  21   OS << S.str();
  22   return OS;
  23 }
  24
  25 std::ostream &operator<<(std::ostream &OS,
  26                          const std::pair<StringRef, StringRef> &P) {
  27   OS << "(" << P.first << ", " << P.second << ")";
  28   return OS;
  29 }
  30
  31 }
  32
  33 namespace {
  34 TEST(StringRefTest, Construction) {
  35   EXPECT_EQ("", StringRef());
  36   EXPECT_EQ("hello", StringRef("hello"));
  37   EXPECT_EQ("hello", StringRef("hello world", 5));
  38   EXPECT_EQ("hello", StringRef(std::string("hello")));
  39 }
  40
  41 TEST(StringRefTest, Iteration) {
  42   StringRef S("hello");
  43   const char *p = "hello";
  44   for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
  45     EXPECT_EQ(*it, *p);
  46 }
  47
  48 TEST(StringRefTest, StringOps) {
  49   const char *p = "hello";
  50   EXPECT_EQ(p, StringRef(p, 0).data());
  51   EXPECT_TRUE(StringRef().empty());
  52   EXPECT_EQ((size_t) 5, StringRef("hello").size());
  53   EXPECT_EQ(-1, StringRef("aab").compare("aad"));
  54   EXPECT_EQ( 0, StringRef("aab").compare("aab"));
  55   EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
  56   EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
  57   EXPECT_EQ( 1, StringRef("aab").compare("aa"));
  58   EXPECT_EQ( 1, StringRef("\xFF").compare("\1"));
  59
  60   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aAd"));
  61   EXPECT_EQ( 0, StringRef("AaB").compare_lower("aab"));
  62   EXPECT_EQ( 1, StringRef("AaB").compare_lower("AAA"));
  63   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aaBb"));
  64   EXPECT_EQ( 1, StringRef("AaB").compare_lower("aA"));
  65   EXPECT_EQ( 1, StringRef("\xFF").compare_lower("\1"));
  66
  67   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aad"));
  68   EXPECT_EQ( 0, StringRef("aab").compare_numeric("aab"));
  69   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aaa"));
  70   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aabb"));
  71   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aa"));
  72   EXPECT_EQ(-1, StringRef("1").compare_numeric("10"));
  73   EXPECT_EQ( 0, StringRef("10").compare_numeric("10"));
  74   EXPECT_EQ( 0, StringRef("10a").compare_numeric("10a"));
  75   EXPECT_EQ( 1, StringRef("2").compare_numeric("1"));
  76   EXPECT_EQ( 0, StringRef("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
  77   EXPECT_EQ( 1, StringRef("\xFF").compare_numeric("\1"));
  78   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V1_q0"));
  79   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V16"));
  80   EXPECT_EQ(-1, StringRef("V8_q0").compare_numeric("V16"));
  81   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V8_q0"));
  82   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V8_q0"));
  83   EXPECT_EQ( 1, StringRef("V8_q0").compare_numeric("V1_q0"));
  84 }
  85
  86 TEST(StringRefTest, Operators) {
  87   EXPECT_EQ("", StringRef());
  88   EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
  89   EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
  90   EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
  91   EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
  92   EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
  93   EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
  94   EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
  95   EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
  96   EXPECT_EQ(StringRef("aab"), StringRef("aab"));
  97   EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
  98   EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
  99   EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
 100   EXPECT_EQ('a', StringRef("aab")[1]);
 101 }
 102
 103 TEST(StringRefTest, Substr) {
 104   StringRef Str("hello");
 105   EXPECT_EQ("lo", Str.substr(3));
 106   EXPECT_EQ("", Str.substr(100));
 107   EXPECT_EQ("hello", Str.substr(0, 100));
 108   EXPECT_EQ("o", Str.substr(4, 10));
 109 }
 110
 111 TEST(StringRefTest, Slice) {
 112   StringRef Str("hello");
 113   EXPECT_EQ("l", Str.slice(2, 3));
 114   EXPECT_EQ("ell", Str.slice(1, 4));
 115   EXPECT_EQ("llo", Str.slice(2, 100));
 116   EXPECT_EQ("", Str.slice(2, 1));
 117   EXPECT_EQ("", Str.slice(10, 20));
 118 }
 119
 120 TEST(StringRefTest, Split) {
 121   StringRef Str("hello");
 122   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 123             Str.split('X'));
 124   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
 125             Str.split('e'));
 126   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 127             Str.split('h'));
 128   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("lo")),
 129             Str.split('l'));
 130   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 131             Str.split('o'));
 132
 133   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 134             Str.rsplit('X'));
 135   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
 136             Str.rsplit('e'));
 137   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 138             Str.rsplit('h'));
 139   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
 140             Str.rsplit('l'));
 141   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 142             Str.rsplit('o'));
 143 }
 144
 145 TEST(StringRefTest, Split2) {
 146   SmallVector<StringRef, 5> parts;
 147   SmallVector<StringRef, 5> expected;
 148
 149   expected.push_back("ab"); expected.push_back("c");
 150   StringRef(",ab,,c,").split(parts, ",", -1, false);
 151   EXPECT_TRUE(parts == expected);
 152
 153   expected.clear(); parts.clear();
 154   expected.push_back(""); expected.push_back("ab"); expected.push_back("");
 155   expected.push_back("c"); expected.push_back("");
 156   StringRef(",ab,,c,").split(parts, ",", -1, true);
 157   EXPECT_TRUE(parts == expected);
 158
 159   expected.clear(); parts.clear();
 160   expected.push_back("");
 161   StringRef("").split(parts, ",", -1, true);
 162   EXPECT_TRUE(parts == expected);
 163
 164   expected.clear(); parts.clear();
 165   StringRef("").split(parts, ",", -1, false);
 166   EXPECT_TRUE(parts == expected);
 167
 168   expected.clear(); parts.clear();
 169   StringRef(",").split(parts, ",", -1, false);
 170   EXPECT_TRUE(parts == expected);
 171
 172   expected.clear(); parts.clear();
 173   expected.push_back(""); expected.push_back("");
 174   StringRef(",").split(parts, ",", -1, true);
 175   EXPECT_TRUE(parts == expected);
 176
 177   expected.clear(); parts.clear();
 178   expected.push_back("a"); expected.push_back("b");
 179   StringRef("a,b").split(parts, ",", -1, true);
 180   EXPECT_TRUE(parts == expected);
 181
 182   // Test MaxSplit
 183   expected.clear(); parts.clear();
 184   expected.push_back("a,,b,c");
 185   StringRef("a,,b,c").split(parts, ",", 0, true);
 186   EXPECT_TRUE(parts == expected);
 187
 188   expected.clear(); parts.clear();
 189   expected.push_back("a,,b,c");
 190   StringRef("a,,b,c").split(parts, ",", 0, false);
 191   EXPECT_TRUE(parts == expected);
 192
 193   expected.clear(); parts.clear();
 194   expected.push_back("a"); expected.push_back(",b,c");
 195   StringRef("a,,b,c").split(parts, ",", 1, true);
 196   EXPECT_TRUE(parts == expected);
 197
 198   expected.clear(); parts.clear();
 199   expected.push_back("a"); expected.push_back(",b,c");
 200   StringRef("a,,b,c").split(parts, ",", 1, false);
 201   EXPECT_TRUE(parts == expected);
 202
 203   expected.clear(); parts.clear();
 204   expected.push_back("a"); expected.push_back(""); expected.push_back("b,c");
 205   StringRef("a,,b,c").split(parts, ",", 2, true);
 206   EXPECT_TRUE(parts == expected);
 207
 208   expected.clear(); parts.clear();
 209   expected.push_back("a"); expected.push_back("b,c");
 210   StringRef("a,,b,c").split(parts, ",", 2, false);
 211   EXPECT_TRUE(parts == expected);
 212
 213   expected.clear(); parts.clear();
 214   expected.push_back("a"); expected.push_back(""); expected.push_back("b");
 215   expected.push_back("c");
 216   StringRef("a,,b,c").split(parts, ",", 3, true);
 217   EXPECT_TRUE(parts == expected);
 218
 219   expected.clear(); parts.clear();
 220   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
 221   StringRef("a,,b,c").split(parts, ",", 3, false);
 222   EXPECT_TRUE(parts == expected);
 223 }
 224
 225 TEST(StringRefTest, Trim) {
 226   StringRef Str0("hello");
 227   StringRef Str1(" hello ");
 228   StringRef Str2("  hello  ");
 229
 230   EXPECT_EQ(StringRef("hello"), Str0.rtrim());
 231   EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
 232   EXPECT_EQ(StringRef("  hello"), Str2.rtrim());
 233   EXPECT_EQ(StringRef("hello"), Str0.ltrim());
 234   EXPECT_EQ(StringRef("hello "), Str1.ltrim());
 235   EXPECT_EQ(StringRef("hello  "), Str2.ltrim());
 236   EXPECT_EQ(StringRef("hello"), Str0.trim());
 237   EXPECT_EQ(StringRef("hello"), Str1.trim());
 238   EXPECT_EQ(StringRef("hello"), Str2.trim());
 239
 240   EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
 241
 242   EXPECT_EQ(StringRef(""), StringRef("").trim());
 243   EXPECT_EQ(StringRef(""), StringRef(" ").trim());
 244   EXPECT_EQ(StringRef("\0", 1), StringRef(" \0 ", 3).trim());
 245   EXPECT_EQ(StringRef("\0\0", 2), StringRef("\0\0", 2).trim());
 246   EXPECT_EQ(StringRef("x"), StringRef("\0\0x\0\0", 5).trim(StringRef("\0", 1)));
 247 }
 248
 249 TEST(StringRefTest, StartsWith) {
 250   StringRef Str("hello");
 251   EXPECT_TRUE(Str.startswith(""));
 252   EXPECT_TRUE(Str.startswith("he"));
 253   EXPECT_FALSE(Str.startswith("helloworld"));
 254   EXPECT_FALSE(Str.startswith("hi"));
 255 }
 256
 257 TEST(StringRefTest, EndsWith) {
 258   StringRef Str("hello");
 259   EXPECT_TRUE(Str.endswith(""));
 260   EXPECT_TRUE(Str.endswith("lo"));
 261   EXPECT_FALSE(Str.endswith("helloworld"));
 262   EXPECT_FALSE(Str.endswith("worldhello"));
 263   EXPECT_FALSE(Str.endswith("so"));
 264 }
 265
 266 TEST(StringRefTest, Find) {
 267   StringRef Str("hello");
 268   EXPECT_EQ(2U, Str.find('l'));
 269   EXPECT_EQ(StringRef::npos, Str.find('z'));
 270   EXPECT_EQ(StringRef::npos, Str.find("helloworld"));
 271   EXPECT_EQ(0U, Str.find("hello"));
 272   EXPECT_EQ(1U, Str.find("ello"));
 273   EXPECT_EQ(StringRef::npos, Str.find("zz"));
 274   EXPECT_EQ(2U, Str.find("ll", 2));
 275   EXPECT_EQ(StringRef::npos, Str.find("ll", 3));
 276   EXPECT_EQ(0U, Str.find(""));
 277   StringRef LongStr("hellx xello hell ello world foo bar hello");
 278   EXPECT_EQ(36U, LongStr.find("hello"));
 279   EXPECT_EQ(28U, LongStr.find("foo"));
 280   EXPECT_EQ(12U, LongStr.find("hell", 2));
 281   EXPECT_EQ(0U, LongStr.find(""));
 282
 283   EXPECT_EQ(3U, Str.rfind('l'));
 284   EXPECT_EQ(StringRef::npos, Str.rfind('z'));
 285   EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
 286   EXPECT_EQ(0U, Str.rfind("hello"));
 287   EXPECT_EQ(1U, Str.rfind("ello"));
 288   EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
 289
 290   EXPECT_EQ(2U, Str.find_first_of('l'));
 291   EXPECT_EQ(1U, Str.find_first_of("el"));
 292   EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
 293
 294   EXPECT_EQ(1U, Str.find_first_not_of('h'));
 295   EXPECT_EQ(4U, Str.find_first_not_of("hel"));
 296   EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
 297
 298   EXPECT_EQ(3U, Str.find_last_not_of('o'));
 299   EXPECT_EQ(1U, Str.find_last_not_of("lo"));
 300   EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
 301 }
 302
 303 TEST(StringRefTest, Count) {
 304   StringRef Str("hello");
 305   EXPECT_EQ(2U, Str.count('l'));
 306   EXPECT_EQ(1U, Str.count('o'));
 307   EXPECT_EQ(0U, Str.count('z'));
 308   EXPECT_EQ(0U, Str.count("helloworld"));
 309   EXPECT_EQ(1U, Str.count("hello"));
 310   EXPECT_EQ(1U, Str.count("ello"));
 311   EXPECT_EQ(0U, Str.count("zz"));
 312 }
 313
 314 TEST(StringRefTest, EditDistance) {
 315   StringRef Str("hello");
 316   EXPECT_EQ(2U, Str.edit_distance("hill"));
 317 }
 318
 319 TEST(StringRefTest, Misc) {
 320   std::string Storage;
 321   raw_string_ostream OS(Storage);
 322   OS << StringRef("hello");
 323   EXPECT_EQ("hello", OS.str());
 324 }
 325
 326 TEST(StringRefTest, Hashing) {
 327   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
 328   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
 329   std::string S = "hello world";
 330   hash_code H = hash_value(S);
 331   EXPECT_EQ(H, hash_value(StringRef("hello world")));
 332   EXPECT_EQ(H, hash_value(StringRef(S)));
 333   EXPECT_NE(H, hash_value(StringRef("hello worl")));
 334   EXPECT_EQ(hash_value(std::string("hello worl")),
 335             hash_value(StringRef("hello worl")));
 336   EXPECT_NE(H, hash_value(StringRef("hello world ")));
 337   EXPECT_EQ(hash_value(std::string("hello world ")),
 338             hash_value(StringRef("hello world ")));
 339   EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
 340   EXPECT_NE(hash_value(std::string("ello worl")),
 341             hash_value(StringRef("hello world").slice(1, -1)));
 342 }
 343
 344 struct UnsignedPair {
 345   const char *Str;
 346   uint64_t Expected;
 347 } Unsigned[] =
 348   { {"0", 0}
 349   , {"255", 255}
 350   , {"256", 256}
 351   , {"65535", 65535}
 352   , {"65536", 65536}
 353   , {"4294967295", 4294967295ULL}
 354   , {"4294967296", 4294967296ULL}
 355   , {"18446744073709551615", 18446744073709551615ULL}
 356   , {"042", 34}
 357   , {"0x42", 66}
 358   , {"0b101010", 42}
 359   };
 360
 361 struct SignedPair {
 362   const char *Str;
 363   int64_t Expected;
 364 } Signed[] =
 365   { {"0", 0}
 366   , {"-0", 0}
 367   , {"127", 127}
 368   , {"128", 128}
 369   , {"-128", -128}
 370   , {"-129", -129}
 371   , {"32767", 32767}
 372   , {"32768", 32768}
 373   , {"-32768", -32768}
 374   , {"-32769", -32769}
 375   , {"2147483647", 2147483647LL}
 376   , {"2147483648", 2147483648LL}
 377   , {"-2147483648", -2147483648LL}
 378   , {"-2147483649", -2147483649LL}
 379   , {"-9223372036854775808", -(9223372036854775807LL) - 1}
 380   , {"042", 34}
 381   , {"0x42", 66}
 382   , {"0b101010", 42}
 383   , {"-042", -34}
 384   , {"-0x42", -66}
 385   , {"-0b101010", -42}
 386   };
 387
 388 TEST(StringRefTest, getAsInteger) {
 389   uint8_t U8;
 390   uint16_t U16;
 391   uint32_t U32;
 392   uint64_t U64;
 393
 394   for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
 395     bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
 396     if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 397       ASSERT_FALSE(U8Success);
 398       EXPECT_EQ(U8, Unsigned[i].Expected);
 399     } else {
 400       ASSERT_TRUE(U8Success);
 401     }
 402     bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
 403     if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 404       ASSERT_FALSE(U16Success);
 405       EXPECT_EQ(U16, Unsigned[i].Expected);
 406     } else {
 407       ASSERT_TRUE(U16Success);
 408     }
 409     bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
 410     if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 411       ASSERT_FALSE(U32Success);
 412       EXPECT_EQ(U32, Unsigned[i].Expected);
 413     } else {
 414       ASSERT_TRUE(U32Success);
 415     }
 416     bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
 417     if (static_cast<uint64_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 418       ASSERT_FALSE(U64Success);
 419       EXPECT_EQ(U64, Unsigned[i].Expected);
 420     } else {
 421       ASSERT_TRUE(U64Success);
 422     }
 423   }
 424
 425   int8_t S8;
 426   int16_t S16;
 427   int32_t S32;
 428   int64_t S64;
 429
 430   for (size_t i = 0; i < array_lengthof(Signed); ++i) {
 431     bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
 432     if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
 433       ASSERT_FALSE(S8Success);
 434       EXPECT_EQ(S8, Signed[i].Expected);
 435     } else {
 436       ASSERT_TRUE(S8Success);
 437     }
 438     bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
 439     if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
 440       ASSERT_FALSE(S16Success);
 441       EXPECT_EQ(S16, Signed[i].Expected);
 442     } else {
 443       ASSERT_TRUE(S16Success);
 444     }
 445     bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
 446     if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
 447       ASSERT_FALSE(S32Success);
 448       EXPECT_EQ(S32, Signed[i].Expected);
 449     } else {
 450       ASSERT_TRUE(S32Success);
 451     }
 452     bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
 453     if (static_cast<int64_t>(Signed[i].Expected) == Signed[i].Expected) {
 454       ASSERT_FALSE(S64Success);
 455       EXPECT_EQ(S64, Signed[i].Expected);
 456     } else {
 457       ASSERT_TRUE(S64Success);
 458     }
 459   }
 460 }
 461
 462
 463 static const char* BadStrings[] = {
 464     "18446744073709551617"  // value just over max
 465   , "123456789012345678901" // value way too large
 466   , "4t23v"                 // illegal decimal characters
 467   , "0x123W56"              // illegal hex characters
 468   , "0b2"                   // illegal bin characters
 469   , "08"                    // illegal oct characters
 470   , "0o8"                   // illegal oct characters
 471   , "-123"                  // negative unsigned value
 472 };
 473
 474
 475 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
 476   unsigned long long U64;
 477   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
 478     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
 479     ASSERT_TRUE(IsBadNumber);
 480   }
 481 }
 482
 483 static const char *join_input[] = { "a", "b", "c" };
 484 static const char join_result1[] = "a";
 485 static const char join_result2[] = "a:b:c";
 486 static const char join_result3[] = "a::b::c";
 487
 488 TEST(StringRefTest, joinStrings) {
 489   std::vector<StringRef> v1;
 490   std::vector<std::string> v2;
 491   for (size_t i = 0; i < array_lengthof(join_input); ++i) {
 492     v1.push_back(join_input[i]);
 493     v2.push_back(join_input[i]);
 494   }
 495
 496   bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
 497   EXPECT_TRUE(v1_join1);
 498   bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
 499   EXPECT_TRUE(v1_join2);
 500   bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
 501   EXPECT_TRUE(v1_join3);
 502
 503   bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
 504   EXPECT_TRUE(v2_join1);
 505   bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
 506   EXPECT_TRUE(v2_join2);
 507   bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
 508   EXPECT_TRUE(v2_join3);
 509 }
 510
 511 } // end anonymous namespace