TST: maintain list containing dtypes in TestPandasDtype

Author: analyticalmonk

pandas/tests/dtypes/test_common.py

@@ -17,11 +17,9 @@ 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'
-        with tm.assertRaisesRegexp(TypeError, msg):
-            pandas_dtype(pd.Timestamp)
-
-        with tm.assertRaisesRegexp(TypeError, msg):
-            pandas_dtype('time')
+        for dtype in [pd.Timestamp, 'time']:
+            with tm.assertRaisesRegexp(TypeError, msg):
+                pandas_dtype(dtype)
 
     def test_numpy_dtype(self):
         for dtype in ['M8[ns]', 'm8[ns]', 'object', 'float64', 'int64']: