tests/utils: Add test_client_quit() helper

https://bugzilla.gnome.org/show_bug.cgi?id=730551

src/tests/test-runner.c

@@ -365,10 +365,7 @@ test_case_do (TestCase *test,
       if (!client)
         return FALSE;
 
-      if (!test_client_do (client, error, "destroy_all", NULL))
-        return FALSE;
-
-      if (!test_client_wait (client, error))
+      if (!test_client_quit (client, error))
         return FALSE;
 
       g_hash_table_remove (test->clients, test_client_get_id (client));

src/tests/test-utils.c

@@ -396,6 +396,19 @@ test_client_new (const char          *id,
   return client;
 }
 
+gboolean
+test_client_quit (TestClient *client,
+                  GError    **error)
+{
+  if (!test_client_do (client, error, "destroy_all", NULL))
+    return FALSE;
+
+  if (!test_client_wait (client, error))
+    return FALSE;
+
+  return TRUE;
+}
+
 void
 test_client_destroy (TestClient *client)
 {

src/tests/test-utils.h

@@ -70,6 +70,9 @@ MetaWindow * test_client_find_window (TestClient *client,
                                       const char *window_id,
                                       GError    **error);
 
+gboolean test_client_quit (TestClient *client,
+                           GError    **error);
+
 TestClient * test_client_new (const char          *id,
                               MetaWindowClientType type,
                               GError             **error);