diff --git a/test_drivers/regression_tests/reg_tests_driver.cpp b/test_drivers/regression_tests/reg_tests_driver.cpp
index 81d97eb..0a3013b 100644
--- a/test_drivers/regression_tests/reg_tests_driver.cpp
+++ b/test_drivers/regression_tests/reg_tests_driver.cpp
@@ -22,6 +22,9 @@ inline void check_impl (bool condition, const char* file, int line)
 // Release 2.2.2
 #include "r2_2_2/basic_functionality.h"
 
+// Release 2.3.1
+#include "r2_3_1/basic_functionality.h"
+
 int main()
 {
 // Release 1.0 Beta 1
@@ -44,4 +47,8 @@ int main()
 //r2_2_2/basic_functionality.h
     id_2852872();
     id_2857454();
+
+// Release 2.3.1
+// r2_3_1/basic_functionality.h
+    id_3414834();
 }
diff --git a/v2_0/test_drivers/regression_tests/r2_3_1/basic_functionality.h b/v2_0/test_drivers/regression_tests/r2_3_1/basic_functionality.h
new file mode 100644
index 0000000..e628328
--- /dev/null
+++ b/v2_0/test_drivers/regression_tests/r2_3_1/basic_functionality.h
@@ -0,0 +1,38 @@
+#include "../../../source/utf8.h"
+
+#include <sstream>
+#include <iterator>
+
+// [ 3414834 ] Testing unchecked::iterator< istreambuf_iterator< char > >
+void id_3414834()
+{
+	typedef std::istreambuf_iterator< char > char_iterator;
+	typedef utf8::unchecked::iterator< char_iterator > utf8_iterator;
+
+	std::string input = "The rain in Spain falls mainly on the plain.";
+	//std::cout << input << std::endl;
+	
+	std::string output;
+	{
+		std::vector< uint32_t > output_characters;
+		{
+			std::stringstream input_stream( input );
+			utf8_iterator const input_terminator;
+			for( 
+				utf8_iterator input_iterator( input_stream );
+				input_iterator != input_terminator;
+				++input_iterator
+			) {
+				output_characters.push_back( *input_iterator );
+			}
+		}
+		
+		utf8::utf32to8( output_characters.begin(), output_characters.end(),
+			std::back_inserter( output )
+		);
+	}
+	//std::cout << output << std::endl;
+
+	check(output == input);
+}
+