fix a unit test

Author: sadavis1

pyomo/contrib/solver/tests/unit/test_base.py

@@ -140,6 +140,7 @@ def test_context_manager(self):
 class TestLegacySolverWrapper(unittest.TestCase):
     def test_class_method_list(self):
         expected_list = [
+            'api_version',
             'available',
             'config_block',
             'default_variable_value',