[mutter] tests/wayland-unit: Move out sync point wait helper

[Marge Bot <marge-bot src gnome org>]

commit 41f488a65ca67ee7e83a952c02af2fae60cc7583
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Sep 14 23:12:00 2022 +0200

    tests/wayland-unit: Move out sync point wait helper
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2624>

 src/tests/meta-wayland-test-driver.c | 25 +++++++++++++++++++++++++
 src/tests/meta-wayland-test-driver.h |  3 +++
 src/tests/wayland-unit-tests.c       | 20 +-------------------
 3 files changed, 29 insertions(+), 19 deletions(-)
---
diff --git a/src/tests/meta-wayland-test-driver.c b/src/tests/meta-wayland-test-driver.c
index d418fa14f3..a9bb251234 100644
--- a/src/tests/meta-wayland-test-driver.c
+++ b/src/tests/meta-wayland-test-driver.c
@@ -331,3 +331,28 @@ meta_wayland_test_driver_set_property (MetaWaylandTestDriver *test_driver,
                         g_strdup (name),
                         g_strdup (value));
 }
+
+static void
+on_sync_point (MetaWaylandTestDriver *test_driver,
+               unsigned int           sequence,
+               struct wl_resource    *surface_resource,
+               struct wl_client      *wl_client,
+               unsigned int          *latest_sequence)
+{
+  *latest_sequence = sequence;
+}
+
+void
+meta_wayland_test_driver_wait_for_sync_point (MetaWaylandTestDriver *test_driver,
+                                              unsigned int           sync_point)
+{
+  gulong handler_id;
+  unsigned int latest_sequence = sync_point - 1;
+
+  handler_id = g_signal_connect (test_driver, "sync-point",
+                                 G_CALLBACK (on_sync_point),
+                                 &latest_sequence);
+  while (latest_sequence != sync_point)
+    g_main_context_iteration (NULL, TRUE);
+  g_signal_handler_disconnect (test_driver, handler_id);
+}
diff --git a/src/tests/meta-wayland-test-driver.h b/src/tests/meta-wayland-test-driver.h
index b20af74496..dbd6ab82ba 100644
--- a/src/tests/meta-wayland-test-driver.h
+++ b/src/tests/meta-wayland-test-driver.h
@@ -34,4 +34,7 @@ void meta_wayland_test_driver_set_property (MetaWaylandTestDriver *test_driver,
                                             const char            *name,
                                             const char            *value);
 
+void meta_wayland_test_driver_wait_for_sync_point (MetaWaylandTestDriver *test_driver,
+                                                   unsigned int           sync_point);
+
 #endif /* META_WAYLAND_TEST_DRIVER_H */
diff --git a/src/tests/wayland-unit-tests.c b/src/tests/wayland-unit-tests.c
index 12dc6d8d36..2dc2f43815 100644
--- a/src/tests/wayland-unit-tests.c
+++ b/src/tests/wayland-unit-tests.c
@@ -385,28 +385,10 @@ toplevel_activation (void)
   meta_wayland_test_client_finish (data.wayland_test_client);
 }
 
-static void
-on_sync_point (MetaWaylandTestDriver *test_driver,
-               unsigned int           sequence,
-               struct wl_resource    *surface_resource,
-               struct wl_client      *wl_client,
-               unsigned int          *latest_sequence)
-{
-  *latest_sequence = sequence;
-}
-
 static void
 wait_for_sync_point (unsigned int sync_point)
 {
-  gulong handler_id;
-  unsigned int latest_sequence = 0;
-
-  handler_id = g_signal_connect (test_driver, "sync-point",
-                                 G_CALLBACK (on_sync_point),
-                                 &latest_sequence);
-  while (latest_sequence != sync_point)
-    g_main_context_iteration (NULL, TRUE);
-  g_signal_handler_disconnect (test_driver, handler_id);
+  meta_wayland_test_driver_wait_for_sync_point (test_driver, sync_point);
 }
 
 static gboolean