diff --git a/glib/tests/logging.c b/glib/tests/logging.c
index 89005a8f8..f90dc74af 100644
--- a/glib/tests/logging.c
+++ b/glib/tests/logging.c
@@ -5,9 +5,6 @@
 static void
 test_warnings (void)
 {
-  if (!g_test_undefined ())
-    return;
-
   if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
     {
       g_warn_if_reached ();
@@ -65,32 +62,29 @@ test_set_handler (void)
 static void
 test_default_handler (void)
 {
-  if (g_test_undefined ())
+  if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
     {
-      if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
-        {
-          g_error ("message1");
-          exit (0);
-        }
-      g_test_trap_assert_failed ();
-      g_test_trap_assert_stderr ("*ERROR*message1*");
-
-      if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
-        {
-          g_critical ("message2");
-          exit (0);
-        }
-      g_test_trap_assert_failed ();
-      g_test_trap_assert_stderr ("*CRITICAL*message2*");
-
-      if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
-        {
-          g_warning ("message3");
-          exit (0);
-        }
-      g_test_trap_assert_failed ();
-      g_test_trap_assert_stderr ("*WARNING*message3*");
+      g_error ("message1");
+      exit (0);
     }
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr ("*ERROR*message1*");
+
+  if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
+    {
+      g_critical ("message2");
+      exit (0);
+    }
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr ("*CRITICAL*message2*");
+
+  if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
+    {
+      g_warning ("message3");
+      exit (0);
+    }
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr ("*WARNING*message3*");
 
   if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
     {
@@ -152,9 +146,6 @@ test_fatal_log_mask (void)
 {
   GLogLevelFlags flags;
 
-  if (!g_test_undefined ())
-    return;
-
   flags = g_log_set_fatal_mask ("bu", G_LOG_LEVEL_INFO);
   if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDOUT))
     g_log ("bu", G_LOG_LEVEL_INFO, "fatal");
@@ -242,9 +233,6 @@ test_handler (const gchar    *log_domain,
 static void
 bug653052 (void)
 {
-  if (!g_test_undefined ())
-    return;
-
   g_test_bug ("653052");
 
   g_test_log_set_fatal_handler (good_failure_handler, fail_str);
diff --git a/glib/tests/testing.c b/glib/tests/testing.c
index d6e39baf8..2b257f258 100644
--- a/glib/tests/testing.c
+++ b/glib/tests/testing.c
@@ -46,22 +46,19 @@ test_assertions (void)
   g_assert_cmpstr ("fzz", >, "faa");
   g_assert_cmpstr ("fzz", ==, "fzz");
 
-  if (g_test_undefined ())
+  if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
     {
-      if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
-        {
-          g_assert_cmpstr ("fzz", !=, "fzz");
-        }
-      g_test_trap_assert_failed ();
-      g_test_trap_assert_stderr ("*assertion failed*");
-
-      if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
-        {
-          g_assert_cmpint (4, !=, 4);
-        }
-      g_test_trap_assert_failed ();
-      g_test_trap_assert_stderr ("*assertion failed*");
+      g_assert_cmpstr ("fzz", !=, "fzz");
     }
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr ("*assertion failed*");
+
+  if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
+    {
+      g_assert_cmpint (4, !=, 4);
+    }
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr ("*assertion failed*");
 }
 
 /* test g_test_timer* API */
@@ -83,9 +80,6 @@ test_timer (void)
 static void
 test_fork_fail (void)
 {
-  if (!g_test_undefined ())
-    return;
-
   if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
     {
       g_assert_not_reached();
@@ -113,9 +107,6 @@ test_fork_patterns (void)
 static void
 test_fork_timeout (void)
 {
-  if (!g_test_undefined ())
-    return;
-
   /* allow child to run for only a fraction of a second */
   if (g_test_trap_fork (0.11 * 1000000, 0))
     {
@@ -226,9 +217,6 @@ fatal_handler (const gchar    *log_domain,
 static void
 test_fatal_log_handler (void)
 {
-  if (!g_test_undefined ())
-    return;
-
   g_test_log_set_fatal_handler (fatal_handler, NULL);
   if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR))
     {