diff --git a/shared/nm-utils/nm-test-utils.h b/shared/nm-utils/nm-test-utils.h
index 51c6c5cfa1..1ed30a05d5 100644
--- a/shared/nm-utils/nm-test-utils.h
+++ b/shared/nm-utils/nm-test-utils.h
@@ -983,6 +983,26 @@ nmtst_rand_perm_gslist (GRand *rand, GSList *list)
 
 /*****************************************************************************/
 
+static inline gboolean
+nmtst_g_source_assert_not_called (gpointer user_data)
+{
+	g_assert_not_reached ();
+	return G_SOURCE_CONTINUE;
+}
+
+static inline gboolean
+nmtst_g_source_set_boolean_true (gpointer user_data)
+{
+	gboolean *ptr = user_data;
+
+	g_assert (ptr);
+	g_assert (!*ptr);
+	*ptr = TRUE;
+	return G_SOURCE_CONTINUE;
+}
+
+/*****************************************************************************/
+
 static inline gboolean
 _nmtst_main_loop_run_timeout (gpointer user_data)
 {