[mutter] unit-tests: Print error when configuring context

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

commit a1d5c96e86f672c2252b95d1e4765f2931f582b6
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Sep 7 10:32:08 2021 +0200

    unit-tests: Print error when configuring context
    
    More helpful than an assert.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1993>

 src/tests/unit-tests.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/tests/unit-tests.c b/src/tests/unit-tests.c
index 0dba16535c..dfad2bdc70 100644
--- a/src/tests/unit-tests.c
+++ b/src/tests/unit-tests.c
@@ -239,10 +239,12 @@ int
 main (int argc, char *argv[])
 {
   g_autoptr (MetaContext) context = NULL;
+  g_autoptr (GError) error = NULL;
 
   context = meta_create_test_context (META_CONTEXT_TEST_TYPE_NESTED,
                                       META_CONTEXT_TEST_FLAG_TEST_CLIENT);
-  g_assert (meta_context_configure (context, &argc, &argv, NULL));
+  if (!meta_context_configure (context, &argc, &argv, &error))
+    g_error ("Failed to configure test context: %s", error->message);
 
   test_context = context;