[glib/wip/rancell/iso8601-2] more tests

[Robert Ancell <rancell src gnome org>]

commit e48f208e3bdd65f702451795ecd46806ef7ea126
Author: Robert Ancell <robert ancell canonical com>
Date:   Sat Jun 24 20:22:18 2017 +1200

    more tests

 glib/tests/gdatetime.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/glib/tests/gdatetime.c b/glib/tests/gdatetime.c
index cbbf64b..efed217 100644
--- a/glib/tests/gdatetime.c
+++ b/glib/tests/gdatetime.c
@@ -604,10 +604,17 @@ test_GDateTime_new_from_iso8601 (void)
   dt = g_date_time_new_from_iso8601 ("2016-W00-1T22:10:42");
   g_assert (dt == NULL);
 
-  /* Largest week is 53 (but only for some years) */
+  /* Week one might be in the previous year */
+  dt = g_date_time_new_from_iso8601 ("2015-W01-1T22:10:42");
+  ASSERT_DATE (dt, 2014, 12, 29);
+  g_date_time_unref (dt);
+
+  /* Last week might be in next year */
   dt = g_date_time_new_from_iso8601 ("2015-W53-7T22:10:42");
   ASSERT_DATE (dt, 2016, 1, 3);
   g_date_time_unref (dt);
+
+  /* Week 53 doesn't always exist */
   dt = g_date_time_new_from_iso8601 ("2016-W53-1T22:10:42");
   g_assert (dt == NULL);