diff --git a/glib/tests/gvariant.c b/glib/tests/gvariant.c
index 2aa80d6da..71011bd81 100644
--- a/glib/tests/gvariant.c
+++ b/glib/tests/gvariant.c
@@ -2886,6 +2886,15 @@ test_container (void)
   g_free (s1);
 }
 
+static void
+do_failed_test (const char *test,
+                const gchar *pattern)
+{
+  g_test_trap_subprocess (test, 1000000, G_TEST_SUBPROCESS_DEFAULT);
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr (pattern);
+}
+
 static void
 test_string (void)
 {
@@ -2937,6 +2946,35 @@ test_utf8 (void)
   g_variant_unref (value);
 }
 
+static void
+test_utf8_bad_new_string (void)
+{
+  g_variant_new_string ("hello\xffworld");
+
+  g_assert_not_reached ();
+}
+
+static void
+test_utf8_bad_new_take_string (void)
+{
+  g_variant_new_take_string (g_strdup ("hello\xffworld"));
+
+  g_assert_not_reached ();
+}
+
+static void
+test_utf8_new_strings (void)
+{
+  if (g_test_undefined ())
+    {
+      do_failed_test ("/gvariant/utf8/subprocess/bad-new-string",
+                      "*g_variant_new_string(): requires valid UTF-8*");
+
+      do_failed_test ("/gvariant/utf8/subprocess/bad-new-take-string",
+                      "*g_variant_new_take_string(): requires valid UTF-8*");
+    }
+}
+
 static void
 test_containers (void)
 {
@@ -2998,15 +3036,6 @@ test_format_strings (void)
   g_assert_null (type);
 }
 
-static void
-do_failed_test (const char *test,
-                const gchar *pattern)
-{
-  g_test_trap_subprocess (test, 1000000, G_TEST_SUBPROCESS_DEFAULT);
-  g_test_trap_assert_failed ();
-  g_test_trap_assert_stderr (pattern);
-}
-
 static void
 test_invalid_varargs (void)
 {
@@ -5863,6 +5892,9 @@ main (int argc, char **argv)
 
   g_test_add_func ("/gvariant/string", test_string);
   g_test_add_func ("/gvariant/utf8", test_utf8);
+  g_test_add_func ("/gvariant/utf8/subprocess/bad-new-string", test_utf8_bad_new_string);
+  g_test_add_func ("/gvariant/utf8/subprocess/bad-new-take-string", test_utf8_bad_new_take_string);
+  g_test_add_func ("/gvariant/utf8-new-strings", test_utf8_new_strings);
   g_test_add_func ("/gvariant/containers", test_containers);
   g_test_add_func ("/gvariant/format-strings", test_format_strings);
   g_test_add_func ("/gvariant/invalid-varargs", test_invalid_varargs);