1 files changed, 605 insertions, 0 deletions

diff --git a/xbmc/utils/test/TestStringUtils.cpp b/xbmc/utils/test/TestStringUtils.cpp
new file mode 100644
index 0000000..0a063cc
--- /dev/null
+++ b/xbmc/utils/test/TestStringUtils.cpp
@@ -0,0 +1,605 @@
+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#include "utils/StringUtils.h"
+
+#include <algorithm>
+
+#include <gtest/gtest.h>
+enum class ECG
+{
+  A,
+  B
+};
+
+enum EG
+{
+  C,
+  D
+};
+
+namespace test_enum
+{
+enum class ECN
+{
+  A = 1,
+  B
+};
+enum EN
+{
+  C = 1,
+  D
+};
+}
+TEST(TestStringUtils, Format)
+{
+  std::string refstr = "test 25 2.7 ff FF";
+
+  std::string varstr =
+      StringUtils::Format("%s %d %.1f %x %02X", "test", 25, 2.743f, 0x00ff, 0x00ff);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  varstr = StringUtils::Format("", "test", 25, 2.743f, 0x00ff, 0x00ff);
+  EXPECT_STREQ("", varstr.c_str());
+}
+
+TEST(TestStringUtils, FormatEnum)
+{
+  const char* zero = "0";
+  const char* one = "1";
+
+  std::string varstr = StringUtils::Format("{}", ECG::A);
+  EXPECT_STREQ(zero, varstr.c_str());
+
+  varstr = StringUtils::Format("{}", EG::C);
+  EXPECT_STREQ(zero, varstr.c_str());
+
+  varstr = StringUtils::Format("{}", test_enum::ECN::A);
+  EXPECT_STREQ(one, varstr.c_str());
+
+  varstr = StringUtils::Format("{}", test_enum::EN::C);
+  EXPECT_STREQ(one, varstr.c_str());
+}
+
+TEST(TestStringUtils, FormatEnumWidth)
+{
+  const char* one = "01";
+
+  std::string varstr = StringUtils::Format("{:02d}", ECG::B);
+  EXPECT_STREQ(one, varstr.c_str());
+
+  varstr = StringUtils::Format("%02d", EG::D);
+  EXPECT_STREQ(one, varstr.c_str());
+}
+
+TEST(TestStringUtils, ToUpper)
+{
+  std::string refstr = "TEST";
+
+  std::string varstr = "TeSt";
+  StringUtils::ToUpper(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, ToLower)
+{
+  std::string refstr = "test";
+
+  std::string varstr = "TeSt";
+  StringUtils::ToLower(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, ToCapitalize)
+{
+  std::string refstr = "Test";
+  std::string varstr = "test";
+  StringUtils::ToCapitalize(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "Just A Test";
+  varstr = "just a test";
+  StringUtils::ToCapitalize(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "Test -1;2:3, String For Case";
+  varstr = "test -1;2:3, string for Case";
+  StringUtils::ToCapitalize(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "  JuST Another\t\tTEst:\nWoRKs ";
+  varstr = "  juST another\t\ttEst:\nwoRKs ";
+  StringUtils::ToCapitalize(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "N.Y.P.D";
+  varstr = "n.y.p.d";
+  StringUtils::ToCapitalize(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "N-Y-P-D";
+  varstr = "n-y-p-d";
+  StringUtils::ToCapitalize(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, EqualsNoCase)
+{
+  std::string refstr = "TeSt";
+
+  EXPECT_TRUE(StringUtils::EqualsNoCase(refstr, "TeSt"));
+  EXPECT_TRUE(StringUtils::EqualsNoCase(refstr, "tEsT"));
+}
+
+TEST(TestStringUtils, Left)
+{
+  std::string refstr, varstr;
+  std::string origstr = "test";
+
+  refstr = "";
+  varstr = StringUtils::Left(origstr, 0);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "te";
+  varstr = StringUtils::Left(origstr, 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "test";
+  varstr = StringUtils::Left(origstr, 10);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, Mid)
+{
+  std::string refstr, varstr;
+  std::string origstr = "test";
+
+  refstr = "";
+  varstr = StringUtils::Mid(origstr, 0, 0);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "te";
+  varstr = StringUtils::Mid(origstr, 0, 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "test";
+  varstr = StringUtils::Mid(origstr, 0, 10);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "st";
+  varstr = StringUtils::Mid(origstr, 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "st";
+  varstr = StringUtils::Mid(origstr, 2, 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "es";
+  varstr = StringUtils::Mid(origstr, 1, 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, Right)
+{
+  std::string refstr, varstr;
+  std::string origstr = "test";
+
+  refstr = "";
+  varstr = StringUtils::Right(origstr, 0);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "st";
+  varstr = StringUtils::Right(origstr, 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  refstr = "test";
+  varstr = StringUtils::Right(origstr, 10);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, Trim)
+{
+  std::string refstr = "test test";
+
+  std::string varstr = " test test   ";
+  StringUtils::Trim(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, TrimLeft)
+{
+  std::string refstr = "test test   ";
+
+  std::string varstr = " test test   ";
+  StringUtils::TrimLeft(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, TrimRight)
+{
+  std::string refstr = " test test";
+
+  std::string varstr = " test test   ";
+  StringUtils::TrimRight(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, Replace)
+{
+  std::string refstr = "text text";
+
+  std::string varstr = "test test";
+  EXPECT_EQ(StringUtils::Replace(varstr, 's', 'x'), 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  EXPECT_EQ(StringUtils::Replace(varstr, 's', 'x'), 0);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  varstr = "test test";
+  EXPECT_EQ(StringUtils::Replace(varstr, "s", "x"), 2);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+
+  EXPECT_EQ(StringUtils::Replace(varstr, "s", "x"), 0);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, StartsWith)
+{
+  std::string refstr = "test";
+
+  EXPECT_FALSE(StringUtils::StartsWithNoCase(refstr, "x"));
+
+  EXPECT_TRUE(StringUtils::StartsWith(refstr, "te"));
+  EXPECT_TRUE(StringUtils::StartsWith(refstr, "test"));
+  EXPECT_FALSE(StringUtils::StartsWith(refstr, "Te"));
+
+  EXPECT_TRUE(StringUtils::StartsWithNoCase(refstr, "Te"));
+  EXPECT_TRUE(StringUtils::StartsWithNoCase(refstr, "TesT"));
+}
+
+TEST(TestStringUtils, EndsWith)
+{
+  std::string refstr = "test";
+
+  EXPECT_FALSE(StringUtils::EndsWithNoCase(refstr, "x"));
+
+  EXPECT_TRUE(StringUtils::EndsWith(refstr, "st"));
+  EXPECT_TRUE(StringUtils::EndsWith(refstr, "test"));
+  EXPECT_FALSE(StringUtils::EndsWith(refstr, "sT"));
+
+  EXPECT_TRUE(StringUtils::EndsWithNoCase(refstr, "sT"));
+  EXPECT_TRUE(StringUtils::EndsWithNoCase(refstr, "TesT"));
+}
+
+TEST(TestStringUtils, Join)
+{
+  std::string refstr, varstr;
+  std::vector<std::string> strarray;
+
+  strarray.emplace_back("a");
+  strarray.emplace_back("b");
+  strarray.emplace_back("c");
+  strarray.emplace_back("de");
+  strarray.emplace_back(",");
+  strarray.emplace_back("fg");
+  strarray.emplace_back(",");
+  refstr = "a,b,c,de,,,fg,,";
+  varstr = StringUtils::Join(strarray, ",");
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, Split)
+{
+  std::vector<std::string> varresults;
+
+  // test overload with string as delimiter
+  varresults = StringUtils::Split("g,h,ij,k,lm,,n", ",");
+  EXPECT_STREQ("g", varresults.at(0).c_str());
+  EXPECT_STREQ("h", varresults.at(1).c_str());
+  EXPECT_STREQ("ij", varresults.at(2).c_str());
+  EXPECT_STREQ("k", varresults.at(3).c_str());
+  EXPECT_STREQ("lm", varresults.at(4).c_str());
+  EXPECT_STREQ("", varresults.at(5).c_str());
+  EXPECT_STREQ("n", varresults.at(6).c_str());
+
+  EXPECT_TRUE(StringUtils::Split("", "|").empty());
+
+  EXPECT_EQ(4U, StringUtils::Split("a bc  d ef ghi ", " ", 4).size());
+  EXPECT_STREQ("d ef ghi ", StringUtils::Split("a bc  d ef ghi ", " ", 4).at(3).c_str()) << "Last part must include rest of the input string";
+  EXPECT_EQ(7U, StringUtils::Split("a bc  d ef ghi ", " ").size()) << "Result must be 7 strings including two empty strings";
+  EXPECT_STREQ("bc", StringUtils::Split("a bc  d ef ghi ", " ").at(1).c_str());
+  EXPECT_STREQ("", StringUtils::Split("a bc  d ef ghi ", " ").at(2).c_str());
+  EXPECT_STREQ("", StringUtils::Split("a bc  d ef ghi ", " ").at(6).c_str());
+
+  EXPECT_EQ(2U, StringUtils::Split("a bc  d ef ghi ", "  ").size());
+  EXPECT_EQ(2U, StringUtils::Split("a bc  d ef ghi ", "  ", 10).size());
+  EXPECT_STREQ("a bc", StringUtils::Split("a bc  d ef ghi ", "  ", 10).at(0).c_str());
+
+  EXPECT_EQ(1U, StringUtils::Split("a bc  d ef ghi ", " z").size());
+  EXPECT_STREQ("a bc  d ef ghi ", StringUtils::Split("a bc  d ef ghi ", " z").at(0).c_str());
+
+  EXPECT_EQ(1U, StringUtils::Split("a bc  d ef ghi ", "").size());
+  EXPECT_STREQ("a bc  d ef ghi ", StringUtils::Split("a bc  d ef ghi ", "").at(0).c_str());
+
+  // test overload with char as delimiter
+  EXPECT_EQ(4U, StringUtils::Split("a bc  d ef ghi ", ' ', 4).size());
+  EXPECT_STREQ("d ef ghi ", StringUtils::Split("a bc  d ef ghi ", ' ', 4).at(3).c_str());
+  EXPECT_EQ(7U, StringUtils::Split("a bc  d ef ghi ", ' ').size()) << "Result must be 7 strings including two empty strings";
+  EXPECT_STREQ("bc", StringUtils::Split("a bc  d ef ghi ", ' ').at(1).c_str());
+  EXPECT_STREQ("", StringUtils::Split("a bc  d ef ghi ", ' ').at(2).c_str());
+  EXPECT_STREQ("", StringUtils::Split("a bc  d ef ghi ", ' ').at(6).c_str());
+
+  EXPECT_EQ(1U, StringUtils::Split("a bc  d ef ghi ", 'z').size());
+  EXPECT_STREQ("a bc  d ef ghi ", StringUtils::Split("a bc  d ef ghi ", 'z').at(0).c_str());
+
+  EXPECT_EQ(1U, StringUtils::Split("a bc  d ef ghi ", "").size());
+  EXPECT_STREQ("a bc  d ef ghi ", StringUtils::Split("a bc  d ef ghi ", 'z').at(0).c_str());
+}
+
+TEST(TestStringUtils, FindNumber)
+{
+  EXPECT_EQ(3, StringUtils::FindNumber("aabcaadeaa", "aa"));
+  EXPECT_EQ(1, StringUtils::FindNumber("aabcaadeaa", "b"));
+}
+
+TEST(TestStringUtils, AlphaNumericCompare)
+{
+  int64_t ref, var;
+
+  ref = 0;
+  var = StringUtils::AlphaNumericCompare(L"123abc", L"abc123");
+  EXPECT_LT(var, ref);
+}
+
+TEST(TestStringUtils, TimeStringToSeconds)
+{
+  EXPECT_EQ(77455, StringUtils::TimeStringToSeconds("21:30:55"));
+  EXPECT_EQ(7*60, StringUtils::TimeStringToSeconds("7 min"));
+  EXPECT_EQ(7*60, StringUtils::TimeStringToSeconds("7 min\t"));
+  EXPECT_EQ(154*60, StringUtils::TimeStringToSeconds("   154 min"));
+  EXPECT_EQ(1*60+1, StringUtils::TimeStringToSeconds("1:01"));
+  EXPECT_EQ(4*60+3, StringUtils::TimeStringToSeconds("4:03"));
+  EXPECT_EQ(2*3600+4*60+3, StringUtils::TimeStringToSeconds("2:04:03"));
+  EXPECT_EQ(2*3600+4*60+3, StringUtils::TimeStringToSeconds("   2:4:3"));
+  EXPECT_EQ(2*3600+4*60+3, StringUtils::TimeStringToSeconds("  \t\t 02:04:03 \n "));
+  EXPECT_EQ(1*3600+5*60+2, StringUtils::TimeStringToSeconds("01:05:02:04:03 \n "));
+  EXPECT_EQ(0, StringUtils::TimeStringToSeconds("blah"));
+  EXPECT_EQ(0, StringUtils::TimeStringToSeconds("ля-ля"));
+}
+
+TEST(TestStringUtils, RemoveCRLF)
+{
+  std::string refstr, varstr;
+
+  refstr = "test\r\nstring\nblah blah";
+  varstr = "test\r\nstring\nblah blah\n";
+  StringUtils::RemoveCRLF(varstr);
+  EXPECT_STREQ(refstr.c_str(), varstr.c_str());
+}
+
+TEST(TestStringUtils, utf8_strlen)
+{
+  size_t ref, var;
+
+  ref = 9;
+  var = StringUtils::utf8_strlen("ｔｅｓｔ＿ＵＴＦ８");
+  EXPECT_EQ(ref, var);
+}
+
+TEST(TestStringUtils, SecondsToTimeString)
+{
+  std::string ref, var;
+
+  ref = "21:30:55";
+  var = StringUtils::SecondsToTimeString(77455);
+  EXPECT_STREQ(ref.c_str(), var.c_str());
+}
+
+TEST(TestStringUtils, IsNaturalNumber)
+{
+  EXPECT_TRUE(StringUtils::IsNaturalNumber("10"));
+  EXPECT_TRUE(StringUtils::IsNaturalNumber(" 10"));
+  EXPECT_TRUE(StringUtils::IsNaturalNumber("0"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber(" 1 0"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber("1.0"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber("1.1"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber("0x1"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber("blah"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber("120 h"));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber(" "));
+  EXPECT_FALSE(StringUtils::IsNaturalNumber(""));
+}
+
+TEST(TestStringUtils, IsInteger)
+{
+  EXPECT_TRUE(StringUtils::IsInteger("10"));
+  EXPECT_TRUE(StringUtils::IsInteger(" -10"));
+  EXPECT_TRUE(StringUtils::IsInteger("0"));
+  EXPECT_FALSE(StringUtils::IsInteger(" 1 0"));
+  EXPECT_FALSE(StringUtils::IsInteger("1.0"));
+  EXPECT_FALSE(StringUtils::IsInteger("1.1"));
+  EXPECT_FALSE(StringUtils::IsInteger("0x1"));
+  EXPECT_FALSE(StringUtils::IsInteger("blah"));
+  EXPECT_FALSE(StringUtils::IsInteger("120 h"));
+  EXPECT_FALSE(StringUtils::IsInteger(" "));
+  EXPECT_FALSE(StringUtils::IsInteger(""));
+}
+
+TEST(TestStringUtils, SizeToString)
+{
+  std::string ref, var;
+
+  ref = "2.00 GB";
+  var = StringUtils::SizeToString(2147483647);
+  EXPECT_STREQ(ref.c_str(), var.c_str());
+}
+
+TEST(TestStringUtils, EmptyString)
+{
+  EXPECT_STREQ("", StringUtils::Empty.c_str());
+}
+
+TEST(TestStringUtils, FindWords)
+{
+  size_t ref, var;
+
+  ref = 5;
+  var = StringUtils::FindWords("test string", "string");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("12345string", "string");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("apple2012", "2012");
+  EXPECT_EQ(ref, var);
+  ref = -1;
+  var = StringUtils::FindWords("12345string", "ring");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("12345string", "345");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("apple2012", "e2012");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("apple2012", "12");
+  EXPECT_EQ(ref, var);
+}
+
+TEST(TestStringUtils, FindWords_NonAscii)
+{
+  size_t ref, var;
+
+  ref = 6;
+  var = StringUtils::FindWords("我的视频", "视频");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("我的视频", "视");
+  EXPECT_EQ(ref, var);
+  var = StringUtils::FindWords("Apple ple", "ple");
+  EXPECT_EQ(ref, var);
+  ref = 7;
+  var = StringUtils::FindWords("Äpfel.pfel", "pfel");
+  EXPECT_EQ(ref, var);
+}
+
+TEST(TestStringUtils, FindEndBracket)
+{
+  int ref, var;
+
+  ref = 11;
+  var = StringUtils::FindEndBracket("atest testbb test", 'a', 'b');
+  EXPECT_EQ(ref, var);
+}
+
+TEST(TestStringUtils, DateStringToYYYYMMDD)
+{
+  int ref, var;
+
+  ref = 20120706;
+  var = StringUtils::DateStringToYYYYMMDD("2012-07-06");
+  EXPECT_EQ(ref, var);
+}
+
+TEST(TestStringUtils, WordToDigits)
+{
+  std::string ref, var;
+
+  ref = "8378 787464";
+  var = "test string";
+  StringUtils::WordToDigits(var);
+  EXPECT_STREQ(ref.c_str(), var.c_str());
+}
+
+TEST(TestStringUtils, CreateUUID)
+{
+  std::cout << "CreateUUID(): " << StringUtils::CreateUUID() << std::endl;
+}
+
+TEST(TestStringUtils, ValidateUUID)
+{
+  EXPECT_TRUE(StringUtils::ValidateUUID(StringUtils::CreateUUID()));
+}
+
+TEST(TestStringUtils, CompareFuzzy)
+{
+  double ref, var;
+
+  ref = 6.25f;
+  var = StringUtils::CompareFuzzy("test string", "string test");
+  EXPECT_EQ(ref, var);
+}
+
+TEST(TestStringUtils, FindBestMatch)
+{
+  double refdouble, vardouble;
+  int refint, varint;
+  std::vector<std::string> strarray;
+
+  refint = 3;
+  refdouble = 0.5625f;
+  strarray.emplace_back("");
+  strarray.emplace_back("a");
+  strarray.emplace_back("e");
+  strarray.emplace_back("es");
+  strarray.emplace_back("t");
+  varint = StringUtils::FindBestMatch("test", strarray, vardouble);
+  EXPECT_EQ(refint, varint);
+  EXPECT_EQ(refdouble, vardouble);
+}
+
+TEST(TestStringUtils, Paramify)
+{
+  const char *input = "some, very \\ odd \"string\"";
+  const char *ref   = "\"some, very \\\\ odd \\\"string\\\"\"";
+
+  std::string result = StringUtils::Paramify(input);
+  EXPECT_STREQ(ref, result.c_str());
+}
+
+TEST(TestStringUtils, sortstringbyname)
+{
+  std::vector<std::string> strarray;
+  strarray.emplace_back("B");
+  strarray.emplace_back("c");
+  strarray.emplace_back("a");
+  std::sort(strarray.begin(), strarray.end(), sortstringbyname());
+
+  EXPECT_STREQ("a", strarray[0].c_str());
+  EXPECT_STREQ("B", strarray[1].c_str());
+  EXPECT_STREQ("c", strarray[2].c_str());
+}
+
+TEST(TestStringUtils, FileSizeFormat)
+{
+  EXPECT_STREQ("0B", StringUtils::FormatFileSize(0).c_str());
+
+  EXPECT_STREQ("999B", StringUtils::FormatFileSize(999).c_str());
+  EXPECT_STREQ("0.98kB", StringUtils::FormatFileSize(1000).c_str());
+
+  EXPECT_STREQ("1.00kB", StringUtils::FormatFileSize(1024).c_str());
+  EXPECT_STREQ("9.99kB", StringUtils::FormatFileSize(10229).c_str());
+
+  EXPECT_STREQ("10.1kB", StringUtils::FormatFileSize(10387).c_str());
+  EXPECT_STREQ("99.9kB", StringUtils::FormatFileSize(102297).c_str());
+
+  EXPECT_STREQ("100kB", StringUtils::FormatFileSize(102400).c_str());
+  EXPECT_STREQ("999kB", StringUtils::FormatFileSize(1023431).c_str());
+
+  EXPECT_STREQ("0.98MB", StringUtils::FormatFileSize(1023897).c_str());
+  EXPECT_STREQ("0.98MB", StringUtils::FormatFileSize(1024000).c_str());
+
+  //Last unit should overflow the 3 digit limit
+  EXPECT_STREQ("5432PB", StringUtils::FormatFileSize(6115888293969133568).c_str());
+}
+
+TEST(TestStringUtils, ToHexadecimal)
+{
+  EXPECT_STREQ("", StringUtils::ToHexadecimal("").c_str());
+  EXPECT_STREQ("616263", StringUtils::ToHexadecimal("abc").c_str());
+  std::string a{"a\0b\n", 4};
+  EXPECT_STREQ("6100620a", StringUtils::ToHexadecimal(a).c_str());
+  std::string nul{"\0", 1};
+  EXPECT_STREQ("00", StringUtils::ToHexadecimal(nul).c_str());
+  std::string ff{"\xFF", 1};
+  EXPECT_STREQ("ff", StringUtils::ToHexadecimal(ff).c_str());
+}