TST: test behavior of passing None to Series constructor

Author: wesm

pandas/tests/test_series.py

@@ -222,6 +222,13 @@ def test_constructor_corner(self):
         s = Series(objs, index=[0, 1])
         self.assert_(isinstance(s, Series))
 
+    def test_constructor_pass_none(self):
+        s = Series(None, index=range(5))
+        self.assert_(s.dtype == np.float64)
+
+        s = Series(None, index=range(5), dtype=object)
+        self.assert_(s.dtype == np.object_)
+
     def test_constructor_cast(self):
         self.assertRaises(ValueError, Series, ['a', 'b', 'c'], dtype=float)