--- a/tests/test_utils.py	Mon Jul 18 15:29:51 2016 +0800
+++ b/tests/test_utils.py	Mon Jul 18 16:04:12 2016 +0800
@@ -1,9 +1,21 @@
+from argparse import Namespace
 from datetime import datetime
 
-from candolint.utils import parse_timestamp, timestamp
+from candolint.utils import parse_timestamp, timestamp, lookup_option
 
 
 def test_timestamp_and_parse():
     result = parse_timestamp(timestamp())
     assert isinstance(result, datetime)
     assert result.utcoffset() is None
+
+
+def test_lookup_option():
+    lo = lookup_option
+
+    assert lo('foo', Namespace(), {}, default='maybe') == 'maybe'
+    assert lo('foo', Namespace(foo='yes'), {}, default='maybe') == 'yes'
+    assert lo('foo', Namespace(foo='yes'), {'foo': 'no'}) == 'yes'
+    assert lo('foo', Namespace(), {'foo': 'no'}, default='maybe') == 'no'
+
+    assert lo('a-b-c', Namespace(a_b_c=1), {'a-b-c': 2}, default=3) == 1