1 files changed, 40 insertions, 0 deletions
diff --git a/prolog/problems/lists/palindrome_1/common.py b/prolog/problems/lists/palindrome_1/common.py
index 5df4b87..ae82c9b 100644
--- a/prolog/problems/lists/palindrome_1/common.py
+++ b/prolog/problems/lists/palindrome_1/common.py
@@ -1,5 +1,9 @@
 # coding=utf-8
 
+from operator import itemgetter
+import prolog.engine
+import server.problems
+
 id = 112
 number = 19
 visible = True
@@ -16,3 +20,39 @@ rev112([H|T], R):-
 palindrome(L) :-
   rev112(L, L).
 '''
+
+test_cases = [
+    ('palindrome([])',
+        [{}]),
+    ('palindrome([a, b, e, A, B, C])',
+        [{'A': 'e', 'B': 'b', 'C': 'a'}]),
+    ('palindrome([b, e, X])',
+        [{'X': 'b'}]),
+]
+
+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:
+                # Limit inferences for each solution to curb unbounded recursion.
+                limited = 'call_with_inference_limit(({}), 100000, _)'.format(query)
+                if prolog.engine.check_answers(engine_id, query=limited, 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 []