added more permutations

Author: jreback

pandas/tests/frame/test_analytics.py

@@ -1923,12 +1923,22 @@ class TestNLargestNSmallest(object):
     @pytest.mark.parametrize(
         'n, order',
         product(range(1, 11),
-                [['a', 'b', 'c'],
-                 ['c', 'b', 'a'],
-                 ['a'],
+                [['a'],
                  ['c'],
                  ['a', 'b'],
-                 ['c', 'b']]))
+                 ['a', 'c'],
+                 ['b', 'a'],
+                 ['b', 'c'],
+                 ['a', 'b', 'c'],
+                 ['c', 'a', 'b'],
+                 ['c', 'b', 'a'],
+                 ['b', 'c', 'a'],
+                 ['b', 'a', 'c'],
+
+                 # dups!
+                 ['b', 'c', 'c'],
+
+                 ]))
     def test_n(self, df_strings, n, order):
         # GH10393
         df = df_strings