diff --git a/src/testdir/test55.ok b/src/testdir/test55.ok
index 559cafa..438a9f2 100644
--- a/src/testdir/test55.ok
+++ b/src/testdir/test55.ok
@@ -76,3 +76,10 @@
 ['-0', 'A11', 'foo', 'foo6', 'x8', 'xaaa', 2, 4, [0, 1, 2]]
 [[0, 1, 2], 4, 2, 'xaaa', 'x8', 'foo6', 'foo', 'A11', '-0']
 ['-0', 'A11', 'foo', 'foo6', 'x8', 'xaaa', 2, 4, [0, 1, 2]]
+['aa', 'bb']
+['aa', 'bb']
+['', 'aa', 'bb', '']
+['', '', 'aa', '', 'bb', '', '']
+['aa', '', 'bb']
+['', 'aa', '', 'bb', '']
+['aa', '', 'bb', 'cc', '']