[mutter] tests/clutter: Port timeline-interpolate to current test suite

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 73da901cd3d6b1f421f92948c4b8955b0b02410d
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Mar 25 16:31:41 2020 +0100

    tests/clutter: Port timeline-interpolate to current test suite
    
    The error tolerance is increased dramatically to make the test less
    flaky when running in CI.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1289

 src/tests/clutter/conform/meson.build            |  1 +
 src/tests/clutter/conform/timeline-interpolate.c | 27 +++++++++++++-----------
 2 files changed, 16 insertions(+), 12 deletions(-)
---
diff --git a/src/tests/clutter/conform/meson.build b/src/tests/clutter/conform/meson.build
index 82ce922f77..fbaa46bd37 100644
--- a/src/tests/clutter/conform/meson.build
+++ b/src/tests/clutter/conform/meson.build
@@ -34,6 +34,7 @@ clutter_conform_tests_general_tests = [
   'interval',
   'script-parser',
   'timeline',
+  'timeline-interpolate',
   'units',
 ]
 
diff --git a/src/tests/clutter/conform/timeline-interpolate.c 
b/src/tests/clutter/conform/timeline-interpolate.c
index 3988c038dd..e60f72b2ef 100644
--- a/src/tests/clutter/conform/timeline-interpolate.c
+++ b/src/tests/clutter/conform/timeline-interpolate.c
@@ -1,8 +1,9 @@
+#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
 #include <stdlib.h>
 #include <glib.h>
 #include <clutter/clutter.h>
 
-#include "test-conform-common.h"
+#include "tests/clutter-test-utils.h"
 
 /* We ask for 1 frame per millisecond.
  * Whenever this rate can't be achieved then the timeline
@@ -12,8 +13,12 @@
 #define TEST_TIMELINE_DURATION 5000
 
 /* We are at the mercy of the system scheduler so this
- * may not be a very reliable tolerance. */
-#define TEST_ERROR_TOLERANCE 20
+ * may not be a very reliable tolerance.
+ *
+ * It's set as very tolerable as otherwise CI, which are
+ * very prone to not get CPU time scheduled, tend to often fail.
+ */
+#define TEST_ERROR_TOLERANCE 150
 
 typedef struct _TestState
 {
@@ -118,19 +123,13 @@ completed_cb (ClutterTimeline *timeline,
   if (state->completion_count == 2)
     {
       if (state->passed)
-       {
-         g_test_message ("Passed\n");
-         clutter_main_quit ();
-       }
+        clutter_main_quit ();
       else
-       {
-         g_test_message ("Failed\n");
-         exit (EXIT_FAILURE);
-       }
+        g_assert_not_reached ();
     }
 }
 
-void
+static void
 timeline_interpolation (void)
 {
   TestState state;
@@ -159,3 +158,7 @@ timeline_interpolation (void)
 
   g_object_unref (state.timeline);
 }
+
+CLUTTER_TEST_SUITE (
+  CLUTTER_TEST_UNIT ("/timeline/interpolate", timeline_interpolation)
+)