Use pytest instead

Author: jtratner

pandas/tests/io/parser/test_parsers.py

@@ -2,7 +2,8 @@
 
 import os
 import tempfile
-import unittest
+
+import pytest
 
 import pandas.util.testing as tm
 
@@ -103,11 +104,12 @@ def read_table(self, *args, **kwds):
         return read_table(*args, **kwds)
 
 
-class TestParameterValidation(unittest.TestCase):
+class TestParameterValidation(object):
     def test_unknown_engine(self):
         with tempfile.NamedTemporaryFile() as fp:
             df = tm.makeDataFrame()
             df.to_csv(fp.name)
             fp.flush()
-            with self.assertRaisesRegex(ValueError, 'Unknown engine'):
+            with pytest.raises(ValueError) as exc_info:
                 read_csv(fp.name, engine='pyt')
+            exc_info.matches('Unknown engine')