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-rw-r--r--prolog/problems/lists/len_2/common.py42
1 files changed, 42 insertions, 0 deletions
diff --git a/prolog/problems/lists/len_2/common.py b/prolog/problems/lists/len_2/common.py
index 7dbdc62..6737f33 100644
--- a/prolog/problems/lists/len_2/common.py
+++ b/prolog/problems/lists/len_2/common.py
@@ -1,5 +1,9 @@
# coding=utf-8
+from operator import itemgetter
+import prolog.engine
+import server.problems
+
id = 119
number = 26
visible = True
@@ -11,3 +15,41 @@ len([_|T], Len) :-
len(T, LenT),
Len is LenT + 1.
'''
+
+test_cases = [
+ ('len([8,3,5,1], X)',
+ [{'X': '4'}]),
+ ('len([2,-3,5,0,3], X)',
+ [{'X': '5'}]),
+ ('len([], X)',
+ [{'X': '0'}]),
+]
+
+def test(program, solved_problems):
+ code = (program + '\n' +
+ server.problems.solutions_for_problems('prolog', solved_problems))
+
+ engine_id = None
+ try:
+ engine_id, output = prolog.engine.create(code=code, timeout=1.0)
+ if not engine_id or 'error' in map(itemgetter(0), output):
+ # Engine creation failed, or syntax error in code.
+ return 0, len(test_cases)
+
+ n_correct = 0
+ 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 []