adding series nan test

Author: Andrew Archer

pandas/tests/frame/test_analytics.py

@@ -2077,12 +2077,12 @@ def test_n_duplicate_index(self, df_duplicates, n, order):
     def test_series_broadcasting(self):
         # smoke test for numpy warnings
         # GH 16378, GH 16306
-        df = DataFrame({'A': [np.nan, 2.0, np.nan]})
+        df = DataFrame([1.0, 1.0, 1.0])
+        df_nan = DataFrame({'A': [np.nan, 2.0, np.nan]})
         s = Series([1, 1, 1])
+        s_nan = Series([np.nan, np.nan, 1])
 
         with tm.assert_produces_warning(None):
-            df.clip_lower(s, axis=0)
-            df.gt(s, axis=0)
-            df.lt(s, axis=0)
-            df.le(s, axis=0)
-            df.ge(s, axis=0)
+            df_nan.clip_lower(s, axis=0)
+            for op in ['lt', 'le', 'gt', 'ge', 'eq', 'ne']:
+                getattr(df, op)(s_nan, axis=0)