Add some calendar tests

Check that the getters and setters work as documented.

This tests the fix in 1f8985e476.

testsuite/gtk/calendar.c

@@ -0,0 +1,64 @@
+#include <gtk/gtk.h>
+
+static void
+test_calendar_set_day (void)
+{
+  GtkWidget *cal;
+  GTimeZone *tz;
+  GDateTime *dt;
+  GDateTime *dt2;
+
+  cal = gtk_calendar_new ();
+
+#if GLIB_CHECK_VERSION(2,68,0)
+  tz = g_time_zone_new_identifier ("MET");
+#else
+  tz = g_time_zone_new ("MET");
+#endif
+  g_assert_nonnull (tz);
+  dt = g_date_time_new (tz, 1970, 3, 1, 0, 0, 0);
+  g_assert_nonnull (dt);
+
+  gtk_calendar_select_day (GTK_CALENDAR (cal), dt);
+
+  dt2 = gtk_calendar_get_date (GTK_CALENDAR (cal));
+  g_assert_true (g_date_time_equal (dt, dt2));
+
+  g_date_time_unref (dt);
+  g_date_time_unref (dt2);
+  g_time_zone_unref (tz);
+}
+
+static void
+test_calendar_properties (void)
+{
+  GtkWidget *cal;
+  GDateTime *dt2;
+
+  cal = gtk_calendar_new ();
+
+  g_object_set (cal,
+                "year", 1970,
+                "month", 2, /* March */
+                "day", 1,
+                NULL);
+
+  dt2 = gtk_calendar_get_date (GTK_CALENDAR (cal));
+  g_assert_cmpint (g_date_time_get_year (dt2), ==, 1970);
+  g_assert_cmpint (g_date_time_get_month (dt2), ==, 3);
+  g_assert_cmpint (g_date_time_get_day_of_month (dt2), ==, 1);
+
+  g_date_time_unref (dt2);
+}
+
+int
+main (int argc, char *argv[])
+{
+  gtk_init ();
+  (g_test_init) (&argc, &argv, NULL);
+
+  g_test_add_func ("/calendar/set_day", test_calendar_set_day);
+  g_test_add_func ("/calendar/properties", test_calendar_properties);
+
+  return g_test_run ();
+}

testsuite/gtk/meson.build

@@ -31,6 +31,7 @@ tests = [
     'link_args': gtk_tests_export_dynamic_ldflag,
   },
   { 'name': 'builderparser' },
+  { 'name': 'calendar' },
   { 'name': 'cellarea' },
   { 'name': 'check-icon-names' },
   { 'name': 'cssprovider' },