[mutter] tests/monitor-transform: Also test invert()

[Jonas Ådahl <jadahl src gnome org>]

commit dec97a65410c92b2048c6ca782655abeb49d2a8c
Author: Robert Mader <robert mader posteo de>
Date:   Sat May 9 02:12:30 2020 +0200

    tests/monitor-transform: Also test invert()
    
    Commit e06daa58c335b7 changed the tested values to use corresponding valid
    enum values instead of negative ones. Unfortunately that made one value
    become a duplicate of an existing one and also in part defeated the original
    intention of checking the implementation of
    `meta_output_crtc_to_logical_transform`.
    
    Use `meta_monitor_transform_invert` to fix both shortcomings.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1242

 src/backends/meta-monitor-transform.h | 1 +
 src/tests/monitor-transform-tests.c   | 9 +++++----
 2 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/src/backends/meta-monitor-transform.h b/src/backends/meta-monitor-transform.h
index e5757e869..c49e29e81 100644
--- a/src/backends/meta-monitor-transform.h
+++ b/src/backends/meta-monitor-transform.h
@@ -52,6 +52,7 @@ meta_monitor_transform_is_flipped (MetaMonitorTransform transform)
   return (transform >= META_MONITOR_TRANSFORM_FLIPPED);
 }
 
+META_EXPORT_TEST
 MetaMonitorTransform meta_monitor_transform_invert (MetaMonitorTransform transform);
 
 META_EXPORT_TEST
diff --git a/src/tests/monitor-transform-tests.c b/src/tests/monitor-transform-tests.c
index fb505d00c..871a06b10 100644
--- a/src/tests/monitor-transform-tests.c
+++ b/src/tests/monitor-transform-tests.c
@@ -62,22 +62,23 @@ test_transform (void)
     },
     {
       .transform = META_MONITOR_TRANSFORM_NORMAL,
-      .other = META_MONITOR_TRANSFORM_270,
+      .other = meta_monitor_transform_invert (META_MONITOR_TRANSFORM_90),
       .expect = META_MONITOR_TRANSFORM_270,
     },
     {
       .transform = META_MONITOR_TRANSFORM_FLIPPED,
-      .other = META_MONITOR_TRANSFORM_270,
+      .other = meta_monitor_transform_invert (META_MONITOR_TRANSFORM_90),
       .expect = META_MONITOR_TRANSFORM_FLIPPED_270,
     },
     {
       .transform = META_MONITOR_TRANSFORM_FLIPPED_180,
-      .other = META_MONITOR_TRANSFORM_90,
+      .other = meta_monitor_transform_invert (META_MONITOR_TRANSFORM_270),
       .expect = META_MONITOR_TRANSFORM_FLIPPED_270,
     },
     {
       .transform = META_MONITOR_TRANSFORM_FLIPPED_180,
-      .other = META_MONITOR_TRANSFORM_FLIPPED_180,
+      .other =
+        meta_monitor_transform_invert (META_MONITOR_TRANSFORM_FLIPPED_180),
       .expect = META_MONITOR_TRANSFORM_NORMAL,
     },
   };