From 0aa5a6d59744727f8f486f35f1501aab87e4c529 Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Mon, 14 Dec 2015 20:38:58 +0100
Subject: Add test function for prolog.clp_fd.puzzle_beth

---
 prolog/problems/clp_fd/puzzle_beth_1/common.py | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/prolog/problems/clp_fd/puzzle_beth_1/common.py b/prolog/problems/clp_fd/puzzle_beth_1/common.py
index bf81396..8a975ee 100644
--- a/prolog/problems/clp_fd/puzzle_beth_1/common.py
+++ b/prolog/problems/clp_fd/puzzle_beth_1/common.py
@@ -1,5 +1,9 @@
 # coding=utf-8
 
+from operator import itemgetter
+import prolog.engine
+import server.problems
+
 id = 155
 number = 56
 visible = True
@@ -8,3 +12,35 @@ facts = None
 solution = '''\
 puzzle_beth(X) :-
   X + 2 #= 2*(X-5).'''
+
+test_cases = [
+    ('puzzle_beth(X)',
+        [{'X': '12'}]),
+    ('setof(A, puzzle_beth(A), X)',
+        [{'X': '[12]'}]),
+]
+
+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 []
-- 
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