diff --git a/PHRQ_io_output.cpp b/PHRQ_io_output.cpp
index 46f66896..5eaeb5c1 100644
--- a/PHRQ_io_output.cpp
+++ b/PHRQ_io_output.cpp
@@ -201,7 +201,9 @@ void Phreeqc::
 screen_msg(const char *err_str)
 /* ---------------------------------------------------------------------- */
 {
+#ifndef TESTING
 	if (phrq_io) phrq_io->screen_msg(err_str);
+#endif
 }
 // ---------------------------------------------------------------------- */
 // dump file methods
diff --git a/class_main.cpp b/class_main.cpp
index ee43e385..2730fc9d 100644
--- a/class_main.cpp
+++ b/class_main.cpp
@@ -283,6 +283,9 @@ int Phreeqc::
 write_banner(void)
 /* ---------------------------------------------------------------------- */
 {
+#ifdef TESTING
+	return OK;
+#endif
 	char buffer[80];
 	int len, indent;
 	screen_msg(
diff --git a/transport.cpp b/transport.cpp
index 00fedd8a..e0715df5 100644
--- a/transport.cpp
+++ b/transport.cpp
@@ -501,7 +501,7 @@ transport(void)
 		else
 			sprintf(token, "\nCalculating transport: %d (mobile) cells, %d shifts, %d mixruns...\n\n",
 				count_cells, count_shifts - transport_start + 1, nmix);
-		screen_msg(token);
+		warning_msg(token);
 		max_iter = 0;
 		for (transport_step = transport_start; transport_step <= count_shifts;
 			transport_step++)
@@ -960,8 +960,7 @@ transport(void)
 		{
 			sprintf(token,
 				"\nFor balancing negative concentrations in MCD, added in total to the system:");
-			if (phrq_io)
-				phrq_io->warning_msg(token);
+			warning_msg(token);
 			for (i = 0; i < count_moles_added; i++)
 			{
 				if (!moles_added[i].moles)
@@ -969,8 +968,7 @@ transport(void)
 				sprintf(token,
 					"\t %.4e moles %s.",
 					(double)moles_added[i].moles, moles_added[i].name);
-				if (phrq_io)
-					phrq_io->warning_msg(token);
+				warning_msg(token);
 			}
 		}
 	}