Improve copyright tests

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

tests/cluecode/data/copyrights/regents_license-LICENSE.yml

@@ -7,12 +7,16 @@ copyrights:
   - Copyright 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the
     University of California
   - copyright C 1988 by the Institute of Electrical and Electronics Engineers, Inc.
+  - copyright of UC Berkeley's Berkeley Software
 holders:
   - The Regents of the University of California
   - The Regents of the University of California
   - the Institute of Electrical and Electronics Engineers, Inc.
+  - UC Berkeley's Berkeley Software
 holders_summary:
   - value: The Regents of the University of California
     count: 2
+  - value: UC Berkeley's Berkeley Software
+    count: 1
   - value: the Institute of Electrical and Electronics Engineers, Inc.
     count: 1