diff --git a/tests/test_comments.cpp b/tests/test_comments.cpp
index 23d4a68..a5765dc 100644
--- a/tests/test_comments.cpp
+++ b/tests/test_comments.cpp
@@ -1,9 +1,5 @@
 #define BOOST_TEST_MODULE "test_comments"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
 
 #include <toml.hpp>
 
diff --git a/tests/test_datetime.cpp b/tests/test_datetime.cpp
index 31bdcf7..1759c34 100644
--- a/tests/test_datetime.cpp
+++ b/tests/test_datetime.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_datetime"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/datetime.hpp>
 
 BOOST_AUTO_TEST_CASE(test_local_date)
diff --git a/tests/test_error_detection.cpp b/tests/test_error_detection.cpp
index fbefcd4..3364d16 100644
--- a/tests/test_error_detection.cpp
+++ b/tests/test_error_detection.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_error_detection"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <iostream>
 #include <fstream>
diff --git a/tests/test_expect.cpp b/tests/test_expect.cpp
index d376ef1..131c1cc 100644
--- a/tests/test_expect.cpp
+++ b/tests/test_expect.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_expect"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 #include <unordered_map>
diff --git a/tests/test_extended_conversions.cpp b/tests/test_extended_conversions.cpp
index e84f013..28974d7 100644
--- a/tests/test_extended_conversions.cpp
+++ b/tests/test_extended_conversions.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_extended_conversions"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <deque>
 #include <map>
diff --git a/tests/test_find.cpp b/tests/test_find.cpp
index cf58017..682ce87 100644
--- a/tests/test_find.cpp
+++ b/tests/test_find.cpp
@@ -1,10 +1,5 @@
 #define BOOST_TEST_MODULE "test_find"
-
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
 
 #include <toml.hpp>
 #include <map>
diff --git a/tests/test_find_or.cpp b/tests/test_find_or.cpp
index ed36e3a..8f1eb73 100644
--- a/tests/test_find_or.cpp
+++ b/tests/test_find_or.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_find_or"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 #include <unordered_map>
diff --git a/tests/test_find_or_recursive.cpp b/tests/test_find_or_recursive.cpp
index d31e8b6..22fcfb5 100644
--- a/tests/test_find_or_recursive.cpp
+++ b/tests/test_find_or_recursive.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_find_or_recursive"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 #include <unordered_map>
diff --git a/tests/test_format_error.cpp b/tests/test_format_error.cpp
index 1ae8db6..d347d85 100644
--- a/tests/test_format_error.cpp
+++ b/tests/test_format_error.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_format_error"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <iostream>
 
diff --git a/tests/test_get.cpp b/tests/test_get.cpp
index 090eb07..eaae50e 100644
--- a/tests/test_get.cpp
+++ b/tests/test_get.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_get"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 #include <unordered_map>
diff --git a/tests/test_get_or.cpp b/tests/test_get_or.cpp
index 7aad273..68c4884 100644
--- a/tests/test_get_or.cpp
+++ b/tests/test_get_or.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_get_or"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 #include <unordered_map>
diff --git a/tests/test_lex_boolean.cpp b/tests/test_lex_boolean.cpp
index 933ab9d..b9f830c 100644
--- a/tests/test_lex_boolean.cpp
+++ b/tests/test_lex_boolean.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_lex_boolean"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/lexer.hpp>
 #include "test_lex_aux.hpp"
 
diff --git a/tests/test_lex_datetime.cpp b/tests/test_lex_datetime.cpp
index 25e24bf..75e1c05 100644
--- a/tests/test_lex_datetime.cpp
+++ b/tests/test_lex_datetime.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_lex_datetime"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/lexer.hpp>
 #include "test_lex_aux.hpp"
 
diff --git a/tests/test_lex_floating.cpp b/tests/test_lex_floating.cpp
index e14bdb3..1654874 100644
--- a/tests/test_lex_floating.cpp
+++ b/tests/test_lex_floating.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_lex_floating"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/lexer.hpp>
 #include <limits>
 #include "test_lex_aux.hpp"
diff --git a/tests/test_lex_integer.cpp b/tests/test_lex_integer.cpp
index 1e8a31b..c3171c7 100644
--- a/tests/test_lex_integer.cpp
+++ b/tests/test_lex_integer.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_lex_integer"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/lexer.hpp>
 #include "test_lex_aux.hpp"
 
diff --git a/tests/test_lex_key_comment.cpp b/tests/test_lex_key_comment.cpp
index 1aad90b..2315d86 100644
--- a/tests/test_lex_key_comment.cpp
+++ b/tests/test_lex_key_comment.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "lex_key_comment_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/lexer.hpp>
 #include "test_lex_aux.hpp"
 
diff --git a/tests/test_lex_string.cpp b/tests/test_lex_string.cpp
index 880ee92..fb42ee3 100644
--- a/tests/test_lex_string.cpp
+++ b/tests/test_lex_string.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_lex_string"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/lexer.hpp>
 #include "test_lex_aux.hpp"
 
diff --git a/tests/test_literals.cpp b/tests/test_literals.cpp
index 9d8ebea..e550845 100644
--- a/tests/test_literals.cpp
+++ b/tests/test_literals.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_literals"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 
diff --git a/tests/test_parse_array.cpp b/tests/test_parse_array.cpp
index ee6a9ae..9943a98 100644
--- a/tests/test_parse_array.cpp
+++ b/tests/test_parse_array.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_array<toml::value>_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_boolean.cpp b/tests/test_parse_boolean.cpp
index 92c0042..f6cb26f 100644
--- a/tests/test_parse_boolean.cpp
+++ b/tests/test_parse_boolean.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_parse_boolean"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_datetime.cpp b/tests/test_parse_datetime.cpp
index 5e86108..e4b2d23 100644
--- a/tests/test_parse_datetime.cpp
+++ b/tests/test_parse_datetime.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_datetime_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_file.cpp b/tests/test_parse_file.cpp
index 144168b..0bce6b7 100644
--- a/tests/test_parse_file.cpp
+++ b/tests/test_parse_file.cpp
@@ -1,26 +1,11 @@
 #define BOOST_TEST_MODULE "test_parse_file"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <iostream>
 #include <fstream>
 #include <map>
 #include <deque>
-#include <cstdlib>
-
-static auto testinput(const std::string& basename) -> std::string
-{
-    const auto this_or_that = [](const char *const s, const char *const t) { return s ? s : t; };
-    std::string directory = this_or_that(std::getenv("TOMLDIR"), "toml");
-    if (!directory.empty() && directory.back() != '/')
-    {
-        directory.push_back('/');
-    }
-    return directory.append("tests/").append(basename);
-}
 
 BOOST_AUTO_TEST_CASE(test_example)
 {
diff --git a/tests/test_parse_floating.cpp b/tests/test_parse_floating.cpp
index 3fa2d03..dbe012d 100644
--- a/tests/test_parse_floating.cpp
+++ b/tests/test_parse_floating.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_floating_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include <cmath>
 #include "test_parse_aux.hpp"
diff --git a/tests/test_parse_inline_table.cpp b/tests/test_parse_inline_table.cpp
index 9b3460a..dad3257 100644
--- a/tests/test_parse_inline_table.cpp
+++ b/tests/test_parse_inline_table.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_inline_table_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_integer.cpp b/tests/test_parse_integer.cpp
index ea203af..2d8e97f 100644
--- a/tests/test_parse_integer.cpp
+++ b/tests/test_parse_integer.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_integer_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_key.cpp b/tests/test_parse_key.cpp
index f7448a6..24e8f02 100644
--- a/tests/test_parse_key.cpp
+++ b/tests/test_parse_key.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_key_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_string.cpp b/tests/test_parse_string.cpp
index 4837460..63e734e 100644
--- a/tests/test_parse_string.cpp
+++ b/tests/test_parse_string.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_string_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_table.cpp b/tests/test_parse_table.cpp
index b6c9dd0..f5b8856 100644
--- a/tests/test_parse_table.cpp
+++ b/tests/test_parse_table.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_table_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include <toml/get.hpp>
 #include "test_parse_aux.hpp"
diff --git a/tests/test_parse_table_key.cpp b/tests/test_parse_table_key.cpp
index 1a7466b..18ba2ea 100644
--- a/tests/test_parse_table_key.cpp
+++ b/tests/test_parse_table_key.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "parse_table_key_test"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/parser.hpp>
 #include "test_parse_aux.hpp"
 
diff --git a/tests/test_parse_unicode.cpp b/tests/test_parse_unicode.cpp
index 7f07cb4..0f891e9 100644
--- a/tests/test_parse_unicode.cpp
+++ b/tests/test_parse_unicode.cpp
@@ -1,24 +1,9 @@
 #define BOOST_TEST_MODULE "test_parse_unicode"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <iostream>
 #include <fstream>
-#include <cstdlib>
-
-static auto testinput(const std::string& basename) -> std::string
-{
-    const auto this_or_that = [](const char *const s, const char *const t) { return s ? s : t; };
-    std::string directory = this_or_that(std::getenv("TOMLDIR"), "toml");
-    if (!directory.empty() && directory.back() != '/')
-    {
-        directory.push_back('/');
-    }
-    return directory.append("tests/").append(basename);
-}
 
 BOOST_AUTO_TEST_CASE(test_hard_example_unicode)
 {
diff --git a/tests/test_result.cpp b/tests/test_result.cpp
index 9a70041..47332d2 100644
--- a/tests/test_result.cpp
+++ b/tests/test_result.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_result"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <iostream>
 #include <toml/result.hpp>
 
diff --git a/tests/test_serialize_file.cpp b/tests/test_serialize_file.cpp
index 305ca0d..d26ce69 100644
--- a/tests/test_serialize_file.cpp
+++ b/tests/test_serialize_file.cpp
@@ -1,11 +1,7 @@
 #define BOOST_TEST_MODULE "test_serialize_file"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
-#include <cstdlib>
 #include <deque>
 #include <map>
 #include <iostream>
@@ -45,17 +41,6 @@ bool has_comment_inside(const toml::basic_value<Comment, Table, Array>& v)
     return true;
 }
 
-static auto testinput(const std::string& basename) -> std::string
-{
-    const auto this_or_that = [](const char *const s, const char *const t) { return s ? s : t; };
-    std::string directory = this_or_that(std::getenv("TOMLDIR"), "toml");
-    if (!directory.empty() && directory.back() != '/')
-    {
-        directory.push_back('/');
-    }
-    return directory.append("tests/").append(basename);
-}
-
 BOOST_AUTO_TEST_CASE(test_example)
 {
     const auto data = toml::parse(testinput("example.toml"));
diff --git a/tests/test_string.cpp b/tests/test_string.cpp
index a9fec2a..2ed2c17 100644
--- a/tests/test_string.cpp
+++ b/tests/test_string.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_string"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 
 BOOST_AUTO_TEST_CASE(test_basic_string)
diff --git a/tests/test_traits.cpp b/tests/test_traits.cpp
index f6f5bc1..ce73d3d 100644
--- a/tests/test_traits.cpp
+++ b/tests/test_traits.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_traits"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/types.hpp>
 
 #include <list>
diff --git a/tests/test_utility.cpp b/tests/test_utility.cpp
index 05981c2..37302cb 100644
--- a/tests/test_utility.cpp
+++ b/tests/test_utility.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_acceptor"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml/utility.hpp>
 #include <vector>
 #include <array>
diff --git a/tests/test_value.cpp b/tests/test_value.cpp
index b25731e..29781ad 100644
--- a/tests/test_value.cpp
+++ b/tests/test_value.cpp
@@ -1,9 +1,6 @@
 #define BOOST_TEST_MODULE "test_value"
-#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
-#include <boost/test/unit_test.hpp>
-#else
-#include <boost/test/included/unit_test.hpp>
-#endif
+#include "unit_test.hpp"
+
 #include <toml.hpp>
 #include <map>
 #include <list>
diff --git a/tests/unit_test.hpp b/tests/unit_test.hpp
new file mode 100644
index 0000000..5999f57
--- /dev/null
+++ b/tests/unit_test.hpp
@@ -0,0 +1,23 @@
+#ifndef BOOST_TEST_MODULE
+#    error "Please #define BOOST_TEST_MODULE before you #include <unit_test.hpp>"
+#endif
+
+#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
+#    include <boost/test/unit_test.hpp>
+#else
+#    include <boost/test/included/unit_test.hpp>
+#endif
+
+#include <cstdlib>
+#include <string>
+
+static inline auto testinput(const std::string& basename) -> std::string
+{
+    const auto this_or_that = [](const char *const s, const char *const t) { return s ? s : t; };
+    std::string directory = this_or_that(std::getenv("TOMLDIR"), "toml");
+    if (!directory.empty() && directory.back() != '/')
+    {
+        directory.push_back('/');
+    }
+    return directory.append("tests/").append(basename);
+}