Update pyomo/contrib/doe/tests/test_doe_build.py

Co-authored-by: Bethany Nicholson <blnicho@users.noreply.github.com>

pyomo/contrib/doe/tests/test_doe_build.py

@@ -265,14 +265,14 @@ def test_reactor_fd_central_design_fixing(self):
                 continue
 
             con_name = con_name_base + str(ind)
-            assert hasattr(model, con_name)
+            self.assertTrue(hasattr(model, con_name))
 
             # Ensure that each set of constraints has all blocks pairs with scenario 0
             # i.e., (0, 1), (0, 2), ..., (0, N) --> N - 1 constraints
-            assert len(getattr(model, con_name)) == (len(model.scenarios) - 1)
+            self.assertEqual(len(getattr(model, con_name)), (len(model.scenarios) - 1))
 
         # Should not have any constraints sets beyond the length of design_vars - 1 (started with index 0)
-        assert not hasattr(model, con_name_base + str(len(design_vars)))
+        self.assertFalse(hasattr(model, con_name_base + str(len(design_vars))))
 
     def test_reactor_fd_backward_design_fixing(self):
         fd_method = "backward"