From 6bda47fb45788f7464b7846bc58d7b90cc65240f Mon Sep 17 00:00:00 2001
From: Aleksander Sadikov <aleksander.sadikov@fri.uni-lj.si>
Date: Fri, 2 Oct 2015 22:27:57 +0200
Subject: Figures, hints and test cases added/updated for father, grandparent,
 brother, and sister problems.

---
 prolog/problems/family_relations/brother_2/common.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'prolog/problems/family_relations/brother_2/common.py')

diff --git a/prolog/problems/family_relations/brother_2/common.py b/prolog/problems/family_relations/brother_2/common.py
index 327e746..3fb685f 100644
--- a/prolog/problems/family_relations/brother_2/common.py
+++ b/prolog/problems/family_relations/brother_2/common.py
@@ -34,6 +34,8 @@ test_cases = [
          {'X': 'kramer'}, {'X': 'michael'}, {'X': 'william'}]),
     ('brother(andrew, X)',
         [{'X': 'melanie'}]),
+    ('brother(X, sally)',
+        [{'X': 'jeffrey'}, {'X': 'william'}]),
 ]
 
 def test(program, solved_problems):
@@ -101,4 +103,4 @@ def hint(program, solved_problems):
         if engine_id:
             prolog.engine.destroy(engine_id)
 
-    return None
+    return []
-- 
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