added more test-cases for pandas_dtype() test

Author: analyticalmonk

pandas/tests/dtypes/test_common.py

@@ -17,10 +17,15 @@ class TestPandasDtype(tm.TestCase):
     # Passing invalid dtype, both as a string or object, must raise TypeError
     def test_invalid_dtype_error(self):
         msg = 'not understood'
-        for dtype in [pd.Timestamp, 'time']:
+        invalid_list = [pd.Timestamp, 'pd.Timestamp']
+        for dtype in invalid_list:
             with tm.assertRaisesRegexp(TypeError, msg):
                 pandas_dtype(dtype)
 
+        valid_list = [object, 'float64', np.float64, float, np.dtype('float64')]
+        for dtype in valid_list:
+            pandas_dtype(dtype)
+
     def test_numpy_dtype(self):
         for dtype in ['M8[ns]', 'm8[ns]', 'object', 'float64', 'int64']:
             self.assertEqual(pandas_dtype(dtype), np.dtype(dtype))