diff --git a/test/db_test_base.py b/test/db_test_base.py
index 29534deb..1fec2229 100644
--- a/test/db_test_base.py
+++ b/test/db_test_base.py
@@ -2015,6 +2015,8 @@ def testFilteringLinkExpression(self):
             ae(filt(None, {a: ['1','-1']}), ['1','3','4'])
             ae(filt(None, {a: ['1','-1']}, ('+',a)), ['3','4','1'])
             ae(filt(None, {a: ['2','-1']}, ('+',a)), ['3','4','2'])
+            ae(filt(None, {a: ['2','-1','-4']}, ('+',a)), ['3','4','2'])
+            ae(filt(None, {a: ['2','-1','-4','-2']}, ('+',a)), ['1'])
             ae(filt(None, {a: ['1','-2']}), ['2','3','4'])
             ae(filt(None, {a: ['1','-2']}, ('+',a)), ['3','4','2'])
             ae(filt(None, {a: ['-1','-2']}, ('+',a)), ['1','2'])