[pango/test-attr-list-equal: 2/2] Add more pango_attr_list_equal tests

[Matthias Clasen <matthiasc src gnome org>]

commit 6e9f21001600a25810d8da7eca784662aaadbd22
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jun 11 08:32:37 2020 -0400

    Add more pango_attr_list_equal tests
    
    Check with NULL and empty lists.

 tests/testattributes.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/tests/testattributes.c b/tests/testattributes.c
index 450857d1..d6c8c87c 100644
--- a/tests/testattributes.c
+++ b/tests/testattributes.c
@@ -627,6 +627,12 @@ test_list_equal (void)
   list1 = pango_attr_list_new ();
   list2 = pango_attr_list_new ();
 
+  g_assert_true (pango_attr_list_equal (NULL, NULL));
+  g_assert_false (pango_attr_list_equal (list1, NULL));
+  g_assert_false (pango_attr_list_equal (NULL, list1));
+  g_assert_true (pango_attr_list_equal (list1, list1));
+  g_assert_true (pango_attr_list_equal (list1, list2));
+
   attr = pango_attr_size_new (10 * PANGO_SCALE);
   attr->start_index = 0;
   attr->end_index = 7;