diff --git a/tests/test_hwm.cpp b/tests/test_hwm.cpp
index 4f6f8c61..eff06faa 100644
--- a/tests/test_hwm.cpp
+++ b/tests/test_hwm.cpp
@@ -21,11 +21,14 @@
 
 
 #include <assert.h>
+#include <stdio.h>
 
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_hwm running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_invalid_rep.cpp b/tests/test_invalid_rep.cpp
index f158b053..2cab713f 100644
--- a/tests/test_invalid_rep.cpp
+++ b/tests/test_invalid_rep.cpp
@@ -22,9 +22,12 @@
 
 #include "../include/zmq.h"
 #include <assert.h>
+#include <stdio.h>
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_pair_inproc running...\n");
+
     //  Create REQ/XREP wiring.
     void *ctx = zmq_init (1);
     assert (ctx);
diff --git a/tests/test_pair_inproc.cpp b/tests/test_pair_inproc.cpp
index 8323fe83..8b54f68c 100644
--- a/tests/test_pair_inproc.cpp
+++ b/tests/test_pair_inproc.cpp
@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_pair_inproc running...\n");
+
     void *ctx = zmq_init (0);
     assert (ctx);
 
diff --git a/tests/test_pair_ipc.cpp b/tests/test_pair_ipc.cpp
index b8361947..f0be1c66 100644
--- a/tests/test_pair_ipc.cpp
+++ b/tests/test_pair_ipc.cpp
@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_pair_ipc running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_pair_tcp.cpp b/tests/test_pair_tcp.cpp
index 82596c95..abd7b56c 100644
--- a/tests/test_pair_tcp.cpp
+++ b/tests/test_pair_tcp.cpp
@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_pair_tcp running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_reqrep_device.cpp b/tests/test_reqrep_device.cpp
index 4ee7cf24..8e8eef44 100644
--- a/tests/test_reqrep_device.cpp
+++ b/tests/test_reqrep_device.cpp
@@ -22,11 +22,14 @@
 
 #include <assert.h>
 #include <string.h>
+#include <stdio.h>
 
 #include "../include/zmq.h"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_reqrep_device running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_reqrep_inproc.cpp b/tests/test_reqrep_inproc.cpp
index d47f3f2c..bc60381e 100644
--- a/tests/test_reqrep_inproc.cpp
+++ b/tests/test_reqrep_inproc.cpp
@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_reqrep_inproc running...\n");
+
     void *ctx = zmq_init (0);
     assert (ctx);
 
diff --git a/tests/test_reqrep_ipc.cpp b/tests/test_reqrep_ipc.cpp
index 96cff697..9644dd12 100644
--- a/tests/test_reqrep_ipc.cpp
+++ b/tests/test_reqrep_ipc.cpp
@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_reqrep_ipc running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_reqrep_tcp.cpp b/tests/test_reqrep_tcp.cpp
index 8331c221..9f1724ed 100644
--- a/tests/test_reqrep_tcp.cpp
+++ b/tests/test_reqrep_tcp.cpp
@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_reqrep_tcp running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_shutdown_stress.cpp b/tests/test_shutdown_stress.cpp
index 65c5a041..a96c7f64 100644
--- a/tests/test_shutdown_stress.cpp
+++ b/tests/test_shutdown_stress.cpp
@@ -23,6 +23,7 @@
 #include <assert.h>
 #include <pthread.h>
 #include <stddef.h>
+#include <stdio.h>
 
 #define THREAD_COUNT 100
 
@@ -53,6 +54,8 @@ int main (int argc, char *argv [])
     int rc;
     pthread_t threads [THREAD_COUNT];
 
+    fprintf (stderr, "test_shutdown_stress running...\n");
+
     for (j = 0; j != 10; j++) {
 
         //  Check the shutdown with many parallel I/O threads.
diff --git a/tests/test_sub_forward.cpp b/tests/test_sub_forward.cpp
index 7ed6aa78..1a3741c6 100644
--- a/tests/test_sub_forward.cpp
+++ b/tests/test_sub_forward.cpp
@@ -20,12 +20,15 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 
 #include "../include/zmq.h"
 #include "../include/zmq_utils.h"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_sub_forward running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);
 
diff --git a/tests/test_timeo.cpp b/tests/test_timeo.cpp
index 83d62cc6..f17314e6 100644
--- a/tests/test_timeo.cpp
+++ b/tests/test_timeo.cpp
@@ -22,6 +22,7 @@
 #include <assert.h>
 #include <string.h>
 #include <pthread.h>
+#include <stdio.h>
 
 #include "../include/zmq.h"
 #include "../include/zmq_utils.h"
@@ -46,6 +47,8 @@ extern "C"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_timeo...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);