[mutter] tests/monitor-config: Improve debugging output

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

commit 180e62519b4697ef263a28aa6a3db746627c0a4d
Author: Thomas Mühlbacher <tmuehlbacher posteo net>
Date:   Thu Jan 28 16:03:10 2021 +0100

    tests/monitor-config: Improve debugging output
    
    Make it easier to find out what went wrong with `migrated_data` by
    having it included in the debug logs.
    
    Closes: <https://gitlab.gnome.org/GNOME/mutter/-/issues/1011>
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1685>

 src/tests/monitor-config-migration-unit-tests.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/tests/monitor-config-migration-unit-tests.c b/src/tests/monitor-config-migration-unit-tests.c
index 461035d630..bb2ac62ccd 100644
--- a/src/tests/monitor-config-migration-unit-tests.c
+++ b/src/tests/monitor-config-migration-unit-tests.c
@@ -75,7 +75,7 @@ test_migration (const char *old_config,
   g_assert_nonnull (expected_data);
   g_assert_nonnull (migrated_data);
 
-  g_assert (strcmp (expected_data, migrated_data) == 0);
+  g_assert_cmpstr (expected_data, ==, migrated_data);
 
   migrated_file = g_file_new_for_path (migrated_path);
   if (!g_file_delete (migrated_file, NULL, &error))