TST: Added numpy.object_ dtype to valid pandas_dtype list

Author: analyticalmonk

pandas/tests/dtypes/test_common.py

@@ -22,7 +22,7 @@ def test_invalid_dtype_error(self):
             with tm.assertRaisesRegexp(TypeError, msg):
                 pandas_dtype(dtype)
 
-        valid_list = [object, 'float64',
+        valid_list = [object, 'float64', np.object_,
                       np.float64, float, np.dtype('float64')]
         for dtype in valid_list:
             pandas_dtype(dtype)