1 files changed, 44 insertions, 0 deletions
diff --git a/prolog/problems/sets/diff_3/common.py b/prolog/problems/sets/diff_3/common.py
index fee93b2..e2706cb 100644
--- a/prolog/problems/sets/diff_3/common.py
+++ b/prolog/problems/sets/diff_3/common.py
@@ -1,5 +1,9 @@
 # coding=utf-8
 
+from operator import itemgetter
+import prolog.engine
+import server.problems
+
 id = 130
 number = 37
 visible = True
@@ -18,3 +22,43 @@ diff([H|T], S2, D) :-
   memb130(H, S2),
   diff(T, S2, D).
 '''
+
+test_cases = [
+    ('diff([], [t, e, q], X)',
+        [{'X': '[]'}]),
+    ('diff([q, r, t], [], A), msort(A, X)',
+        [{'X': '[q, r, t]'}]),
+    ('diff([1, 2, 3, 8, 4, 6], [6, 0, 3, 4], A), msort(A, X)',
+        [{'X': '[1, 2, 8]'}]),
+    ('diff([1, 2, 3, 8, 7, 4, 6], [7, 8, 6], A), msort(A, X)',
+        [{'X': '[1, 2, 3, 4]'}]),
+    ('diff([1, 8, 2, 3, 7, 5], [7], A), msort(A, X)',
+        [{'X': '[1, 2, 3, 5, 8]'}]),
+    ('diff([t, w, q], [t, e, q, w, b], X)',
+        [{'X': '[]'}]),
+]
+
+def test(program, solved_problems):
+    code = (program + '\n' +
+            server.problems.solutions_for_problems('prolog', solved_problems))
+
+    n_correct = 0
+    engine_id = None
+    try:
+        engine_id, output = prolog.engine.create(code=code, timeout=1.0)
+        if engine_id is not None and 'error' not in map(itemgetter(0), output):
+            # Engine successfully created, and no syntax error in program.
+            for query, answers in test_cases:
+                if prolog.engine.check_answers(engine_id, query=query, answers=answers, timeout=1.0):
+                    n_correct += 1
+    finally:
+        if engine_id:
+            prolog.engine.destroy(engine_id)
+
+    passed = n_correct == len(test_cases)
+    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
+    return passed, hints
+
+def hint(program, solved_problems):
+    # TODO
+    return []