diff --git a/libs/cstring/test/cstring.cpp b/libs/cstring/test/cstring.cpp
new file mode 100644
index 00000000..e3d82194
--- /dev/null
+++ b/libs/cstring/test/cstring.cpp
@@ -0,0 +1,48 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_CSTRING_CPP
+#define SPROUT_LIBS_CSTRING_TEST_CSTRING_CPP
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_CPP_INCLUDE_DISABLE_SPROUT_LIBS_CSTRING_TEST_CSTRING_CPP
+#	define TESTSPR_CPP_INCLUDE
+#endif
+
+#include "./memcmp.cpp"
+#include "./strcmp.cpp"
+#include "./strcoll.cpp"
+#include "./strncmp.cpp"
+#include "./memchr.cpp"
+#include "./strchr.cpp"
+#include "./strcspn.cpp"
+#include "./strpbrk.cpp"
+#include "./strrchr.cpp"
+#include "./strspn.cpp"
+#include "./strstr.cpp"
+#include "./strlen.cpp"
+
+#ifdef TESTSPR_CPP_INCLUDE_DISABLE_SPROUT_LIBS_CSTRING_TEST_CSTRING_CPP
+#	undef TESTSPR_CPP_INCLUDE
+#endif
+
+namespace testspr {
+	static void cstring_test() {
+		testspr::cstring_memcmp_test();
+		testspr::cstring_strcmp_test();
+		testspr::cstring_strcoll_test();
+		testspr::cstring_strncmp_test();
+		testspr::cstring_memchr_test();
+		testspr::cstring_strchr_test();
+		testspr::cstring_strcspn_test();
+		testspr::cstring_strpbrk_test();
+		testspr::cstring_strrchr_test();
+		testspr::cstring_strspn_test();
+		testspr::cstring_strstr_test();
+		testspr::cstring_strlen_test();
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_CSTRING_CPP
diff --git a/libs/cstring/test/memchr.cpp b/libs/cstring/test/memchr.cpp
new file mode 100644
index 00000000..0eca7887
--- /dev/null
+++ b/libs/cstring/test/memchr.cpp
@@ -0,0 +1,28 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_MEMCHR_CPP
+#define SPROUT_LIBS_CSTRING_TEST_MEMCHR_CPP
+
+#include <sprout/cstring/memchr.hpp>
+#include <sprout/iterator.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_memchr_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR unsigned char buf[] = "abcdef\0ghij";
+			SPROUT_STATIC_CONSTEXPR unsigned char b = 'h';
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::memchr(buf, b, 12);
+				TESTSPR_BOTH_ASSERT(sprout::distance(buf, reinterpret_cast<unsigned char const*>(found)) == 8);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_memchr_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_MEMCHR_CPP
diff --git a/libs/cstring/test/memcmp.cpp b/libs/cstring/test/memcmp.cpp
new file mode 100644
index 00000000..aa0c5f9d
--- /dev/null
+++ b/libs/cstring/test/memcmp.cpp
@@ -0,0 +1,32 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_MEMCMP_CPP
+#define SPROUT_LIBS_CSTRING_TEST_MEMCMP_CPP
+
+#include <sprout/cstring/memcmp.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_memcmp_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR unsigned char buf[] = "\0abc\0de";
+			SPROUT_STATIC_CONSTEXPR unsigned char buf2[] = "\0abc\0de";
+			SPROUT_STATIC_CONSTEXPR unsigned char buf3[] = "\0abcdef";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::memcmp(buf, buf2, 7);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::memcmp(buf, buf3, 7);
+				TESTSPR_BOTH_ASSERT(result < 0);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_memcmp_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_MEMCMP_CPP
diff --git a/libs/cstring/test/strchr.cpp b/libs/cstring/test/strchr.cpp
new file mode 100644
index 00000000..fb6e583f
--- /dev/null
+++ b/libs/cstring/test/strchr.cpp
@@ -0,0 +1,28 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRCHR_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRCHR_CPP
+
+#include <sprout/cstring/strchr.hpp>
+#include <sprout/iterator.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strchr_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "abcdefghijklmnabcdefghijklmn";
+			SPROUT_STATIC_CONSTEXPR char c = 'd';
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strchr(str, c);
+				TESTSPR_BOTH_ASSERT(sprout::distance(str, found) == 3);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strchr_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRCHR_CPP
diff --git a/libs/cstring/test/strcmp.cpp b/libs/cstring/test/strcmp.cpp
new file mode 100644
index 00000000..a10d6305
--- /dev/null
+++ b/libs/cstring/test/strcmp.cpp
@@ -0,0 +1,42 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRCMP_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRCMP_CPP
+
+#include <sprout/cstring/strcmp.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strcmp_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "ABC";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "ABC";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "ABD";
+			SPROUT_STATIC_CONSTEXPR char str3[] = "B";
+			SPROUT_STATIC_CONSTEXPR char str4[] = "AAAA";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcmp(str, str1);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcmp(str, str2);
+				TESTSPR_BOTH_ASSERT(result < 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcmp(str, str3);
+				TESTSPR_BOTH_ASSERT(result < 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcmp(str, str4);
+				TESTSPR_BOTH_ASSERT(result > 0);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strcmp_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRCMP_CPP
diff --git a/libs/cstring/test/strcoll.cpp b/libs/cstring/test/strcoll.cpp
new file mode 100644
index 00000000..5ecb3507
--- /dev/null
+++ b/libs/cstring/test/strcoll.cpp
@@ -0,0 +1,42 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRCOLL_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRCOLL_CPP
+
+#include <sprout/cstring/strcoll.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strcoll_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "ABC";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "ABC";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "ABD";
+			SPROUT_STATIC_CONSTEXPR char str3[] = "B";
+			SPROUT_STATIC_CONSTEXPR char str4[] = "AAAA";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcoll(str, str1);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcoll(str, str2);
+				TESTSPR_BOTH_ASSERT(result < 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcoll(str, str3);
+				TESTSPR_BOTH_ASSERT(result < 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcoll(str, str4);
+				TESTSPR_BOTH_ASSERT(result > 0);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strcoll_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRCOLL_CPP
diff --git a/libs/cstring/test/strcspn.cpp b/libs/cstring/test/strcspn.cpp
new file mode 100644
index 00000000..efe96ebd
--- /dev/null
+++ b/libs/cstring/test/strcspn.cpp
@@ -0,0 +1,32 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRCSPN_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRCSPN_CPP
+
+#include <sprout/cstring/strcspn.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strcspn_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "abcdefgabcdefghij";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "hj";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "ghj";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcspn(str, str1);
+				TESTSPR_BOTH_ASSERT(result == 14);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strcspn(str, str2);
+				TESTSPR_BOTH_ASSERT(result == 6);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strcspn_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRCSPN_CPP
diff --git a/libs/cstring/test/strlen.cpp b/libs/cstring/test/strlen.cpp
new file mode 100644
index 00000000..6b774805
--- /dev/null
+++ b/libs/cstring/test/strlen.cpp
@@ -0,0 +1,31 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRLEN_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRLEN_CPP
+
+#include <sprout/cstring/strlen.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strlen_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str1[] = "today";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "hello world";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strlen(str1);
+				TESTSPR_BOTH_ASSERT(result == 5);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strlen(str2);
+				TESTSPR_BOTH_ASSERT(result == 11);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strlen_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRLEN_CPP
diff --git a/libs/cstring/test/strncmp.cpp b/libs/cstring/test/strncmp.cpp
new file mode 100644
index 00000000..e8e343d1
--- /dev/null
+++ b/libs/cstring/test/strncmp.cpp
@@ -0,0 +1,57 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRNCMP_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRNCMP_CPP
+
+#include <sprout/cstring/strncmp.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strncmp_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "ABC";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "ABD";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "ABC";
+			SPROUT_STATIC_CONSTEXPR char str3[] = "AAA";
+			SPROUT_STATIC_CONSTEXPR char str4[] = "ABCD";
+			SPROUT_STATIC_CONSTEXPR char str5[] = "AB";
+			SPROUT_STATIC_CONSTEXPR char str6[] = "B";
+			SPROUT_STATIC_CONSTEXPR char str7[] = "A";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str1, 2);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str2, 2);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str3, 2);
+				TESTSPR_BOTH_ASSERT(result > 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str4, 2);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str5, 2);
+				TESTSPR_BOTH_ASSERT(result == 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str6, 2);
+				TESTSPR_BOTH_ASSERT(result < 0);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strncmp(str, str7, 2);
+				TESTSPR_BOTH_ASSERT(result > 0);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strncmp_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRNCMP_CPP
diff --git a/libs/cstring/test/strpbrk.cpp b/libs/cstring/test/strpbrk.cpp
new file mode 100644
index 00000000..e0b33cb6
--- /dev/null
+++ b/libs/cstring/test/strpbrk.cpp
@@ -0,0 +1,33 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRPBRK_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRPBRK_CPP
+
+#include <sprout/cstring/strpbrk.hpp>
+#include <sprout/iterator.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strpbrk_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "abcdefgabcdefghij";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "ghsp";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "sp";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strpbrk(str, str1);
+				TESTSPR_BOTH_ASSERT(sprout::distance(str, found) == 6);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strpbrk(str, str2);
+				TESTSPR_BOTH_ASSERT(!found);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strpbrk_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRPBRK_CPP
diff --git a/libs/cstring/test/strrchr.cpp b/libs/cstring/test/strrchr.cpp
new file mode 100644
index 00000000..97dbcdbf
--- /dev/null
+++ b/libs/cstring/test/strrchr.cpp
@@ -0,0 +1,28 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRRCHR_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRRCHR_CPP
+
+#include <sprout/cstring/strrchr.hpp>
+#include <sprout/iterator.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strrchr_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "abcdefghijklmnabcdefghijklmn";
+			SPROUT_STATIC_CONSTEXPR char c = 'd';
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strrchr(str, c);
+				TESTSPR_BOTH_ASSERT(sprout::distance(str, found) == 17);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strrchr_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRRCHR_CPP
diff --git a/libs/cstring/test/strspn.cpp b/libs/cstring/test/strspn.cpp
new file mode 100644
index 00000000..97587f10
--- /dev/null
+++ b/libs/cstring/test/strspn.cpp
@@ -0,0 +1,32 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRSPN_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRSPN_CPP
+
+#include <sprout/cstring/strspn.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strspn_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "abcdefgabcdefghij";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "abcfg";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "gfedcba";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strspn(str, str1);
+				TESTSPR_BOTH_ASSERT(result == 3);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto result = sprout::strspn(str, str2);
+				TESTSPR_BOTH_ASSERT(result == 14);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strspn_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRSPN_CPP
diff --git a/libs/cstring/test/strstr.cpp b/libs/cstring/test/strstr.cpp
new file mode 100644
index 00000000..28dbb40b
--- /dev/null
+++ b/libs/cstring/test/strstr.cpp
@@ -0,0 +1,43 @@
+#ifndef SPROUT_LIBS_CSTRING_TEST_STRSTR_CPP
+#define SPROUT_LIBS_CSTRING_TEST_STRSTR_CPP
+
+#include <sprout/cstring/strstr.hpp>
+#include <sprout/iterator.hpp>
+#include <testspr/tools.hpp>
+
+namespace testspr {
+	static void cstring_strstr_test() {
+		using namespace sprout;
+		{
+			SPROUT_STATIC_CONSTEXPR char str[] = "abcdefghijklmn";
+			SPROUT_STATIC_CONSTEXPR char str1[] = "defgh";
+			SPROUT_STATIC_CONSTEXPR char str2[] = "xyz";
+			SPROUT_STATIC_CONSTEXPR char str3[] = "abcdefghijklmnopqr";
+			SPROUT_STATIC_CONSTEXPR char str4[] = "";
+
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strstr(str, str1);
+				TESTSPR_BOTH_ASSERT(sprout::distance(str, found) == 3);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strstr(str, str2);
+				TESTSPR_BOTH_ASSERT(!found);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strstr(str, str3);
+				TESTSPR_BOTH_ASSERT(!found);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto found = sprout::strstr(str, str4);
+				TESTSPR_BOTH_ASSERT(sprout::distance(str, found) == 0);
+			}
+		}
+	}
+}	// namespace testspr
+
+#ifndef TESTSPR_CPP_INCLUDE
+#	define TESTSPR_TEST_FUNCTION testspr::cstring_strstr_test
+#	include <testspr/include_main.hpp>
+#endif
+
+#endif	// #ifndef SPROUT_LIBS_CSTRING_TEST_STRSTR_CPP
diff --git a/testspr/sprout.cpp b/testspr/sprout.cpp
index 1e4d839a..4caf18a2 100644
--- a/testspr/sprout.cpp
+++ b/testspr/sprout.cpp
@@ -14,6 +14,7 @@
 #include "../libs/variant/test/variant.cpp"
 #include "../libs/algorithm/test/algorithm.cpp"
 #include "../libs/random/test/random.cpp"
+#include "../libs/cstring/test/cstring.cpp"
 
 #ifdef TESTSPR_CPP_INCLUDE_DISABLE_TESTSPR_SPROUT_HPP
 #	undef TESTSPR_CPP_INCLUDE
@@ -29,6 +30,7 @@ namespace testspr {
 		testspr::variant_test();
 		testspr::algorithm_test();
 		testspr::random_test();
+		testspr::cstring_test();
 	}
 }	// namespace testspr