Fixing test of assertion of closed parameter in fixed windows

Style corrections

Author: carlosdanielcsantos

doc/source/computation.rst

@@ -490,7 +490,7 @@ from present information back to past information. This allows the rolling windo
    df["right"] = df.rolling('2s', closed='right').x.sum() # default
    df["both"] = df.rolling('2s', closed='both').x.sum()
    df["left"] = df.rolling('2s', closed='left').x.sum()
-   df["open"] = df.rolling('2s', closed='neither').x.sum()
+   df["neither"] = df.rolling('2s', closed='neither').x.sum()
 
    df
 

pandas/core/window.py

@@ -1057,7 +1057,7 @@ def validate(self):
 
         if not self.is_datetimelike and self.closed is not None:
             raise ValueError("closed only implemented for datetimelike "
-                                         "and offset based windows")
+                             "and offset based windows")
 
     def _validate_monotonic(self):
         """ validate on is monotonic """

pandas/tests/test_window.py

@@ -431,6 +431,12 @@ def test_numpy_compat(self):
             tm.assertRaisesRegexp(UnsupportedFunctionCall, msg,
                                   getattr(r, func), dtype=np.float64)
 
+    def test_closed(self):
+        df = DataFrame({'A': [0, 1, 2, 3, 4]})
+        # closed only allowed for datetimelike
+        with self.assertRaises(ValueError):
+             df.rolling(window=3, closed='both')
+
 
 class TestExpanding(Base):
 
@@ -3367,10 +3373,6 @@ def test_closed(self):
                               pd.Timestamp('20130101 09:00:04'),
                               pd.Timestamp('20130101 09:00:06')])
 
-        # closed only allowed for datetimelike
-        with self.assertRaises(ValueError):
-             self.regular.rolling(window=3, closed='both')
-
         # closed must be 'right', 'left', 'both', 'neither'
         with self.assertRaises(ValueError):
             self.regular.rolling(window='2s', closed="blabla")