diff --git a/python/gtsam/tests/test_DiscreteBayesTree.py b/python/gtsam/tests/test_DiscreteBayesTree.py
index b1ed4fe69..e1754ca64 100644
--- a/python/gtsam/tests/test_DiscreteBayesTree.py
+++ b/python/gtsam/tests/test_DiscreteBayesTree.py
@@ -13,10 +13,17 @@ Author: Frank Dellaert
 
 import unittest
 
-from gtsam import (DiscreteBayesNet, DiscreteBayesTreeClique,
-                   DiscreteConditional, DiscreteFactorGraph, Ordering)
 from gtsam.utils.test_case import GtsamTestCase
 
+from gtsam import (
+    DiscreteBayesNet,
+    DiscreteBayesTreeClique,
+    DiscreteConditional,
+    DiscreteFactorGraph,
+    DiscreteValues,
+    Ordering,
+)
+
 
 class TestDiscreteBayesNet(GtsamTestCase):
     """Tests for Discrete Bayes Nets."""
@@ -65,15 +72,34 @@ class TestDiscreteBayesNet(GtsamTestCase):
         #     bayesTree[key].printSignature()
         # bayesTree.saveGraph("test_DiscreteBayesTree.dot")
 
-        self.assertFalse(bayesTree.empty())
-        self.assertEqual(12, bayesTree.size())
-
         # The root is P( 8 12 14), we can retrieve it by key:
         root = bayesTree[8]
         self.assertIsInstance(root, DiscreteBayesTreeClique)
         self.assertTrue(root.isRoot())
         self.assertIsInstance(root.conditional(), DiscreteConditional)
 
+        # Test all methods in DiscreteBayesTree
+        self.gtsamAssertEquals(bayesTree, bayesTree)
+
+        # Check value at 0
+        zero_values = DiscreteValues()
+        for j in range(15):
+            zero_values[j] = 0
+        value_at_zeros = bayesTree.evaluate(zero_values)
+        self.assertAlmostEqual(value_at_zeros, 0.0)
+
+        # Check value at max
+        values_star = factorGraph.optimize()
+        max_value = bayesTree.evaluate(values_star)
+        self.assertAlmostEqual(max_value, 0.002548)
+
+        # Check operator sugar
+        max_value = bayesTree(values_star)
+        self.assertAlmostEqual(max_value, 0.002548)
+
+        self.assertFalse(bayesTree.empty())
+        self.assertEqual(12, bayesTree.size())
+
 
 if __name__ == "__main__":
     unittest.main()