diff --git a/test_drivers/regression_tests/reg_tests_driver.cpp b/test_drivers/regression_tests/reg_tests_driver.cpp
index 0a3013b..8f18478 100644
--- a/test_drivers/regression_tests/reg_tests_driver.cpp
+++ b/test_drivers/regression_tests/reg_tests_driver.cpp
@@ -22,8 +22,6 @@ 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()
 {
@@ -48,7 +46,4 @@ int main()
     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
deleted file mode 100644
index e628328..0000000
--- a/v2_0/test_drivers/regression_tests/r2_3_1/basic_functionality.h
+++ /dev/null
@@ -1,38 +0,0 @@
-#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);
-}
-