diff --git a/gtsam/hybrid/tests/testSerializationHybrid.cpp b/gtsam/hybrid/tests/testSerializationHybrid.cpp
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+++ b/gtsam/hybrid/tests/testSerializationHybrid.cpp
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+/* ----------------------------------------------------------------------------
+
+ * GTSAM Copyright 2010, Georgia Tech Research Corporation,
+ * Atlanta, Georgia 30332-0415
+ * All Rights Reserved
+ * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
+
+ * See LICENSE for the license information
+
+ * -------------------------------------------------------------------------- */
+
+/**
+ * @file    testSerializationHybrid.cpp
+ * @brief   Unit tests for hybrid serialization
+ * @author  Varun Agrawal
+ * @date    January 2023
+ */
+
+#include <gtsam/base/serializationTestHelpers.h>
+#include <gtsam/hybrid/GaussianMixtureFactor.h>
+#include <gtsam/hybrid/HybridDiscreteFactor.h>
+#include <gtsam/hybrid/HybridGaussianFactor.h>
+#include <gtsam/inference/Symbol.h>
+
+// Include for test suite
+#include <CppUnitLite/TestHarness.h>
+
+using namespace std;
+using namespace gtsam;
+using symbol_shorthand::M;
+using symbol_shorthand::X;
+
+using namespace serializationTestHelpers;
+
+BOOST_CLASS_EXPORT_GUID(HybridFactor, "gtsam_HybridFactor");
+BOOST_CLASS_EXPORT_GUID(JacobianFactor, "gtsam_JacobianFactor");
+
+BOOST_CLASS_EXPORT_GUID(DecisionTreeFactor, "gtsam_DecisionTreeFactor");
+using ADT = AlgebraicDecisionTree<Key>;
+BOOST_CLASS_EXPORT_GUID(ADT, "gtsam_AlgebraicDecisionTree");
+BOOST_CLASS_EXPORT_GUID(ADT::Leaf, "gtsam_DecisionTree_Leaf")
+BOOST_CLASS_EXPORT_GUID(ADT::Choice, "gtsam_DecisionTree_Choice")
+
+BOOST_CLASS_EXPORT_GUID(gtsam::GaussianMixtureFactor, "gtsam_GaussianMixtureFactor")
+BOOST_CLASS_EXPORT_GUID(gtsam::GaussianMixtureFactor::Factors, "gtsam_GaussianMixtureFactor_Factors")
+BOOST_CLASS_EXPORT_GUID(gtsam::GaussianMixtureFactor::Factors::Leaf, "gtsam_GaussianMixtureFactor_Factors_Leaf")
+BOOST_CLASS_EXPORT_GUID(gtsam::GaussianMixtureFactor::Factors::Choice, "gtsam_GaussianMixtureFactor_Factors_Choice")
+
+// BOOST_CLASS_EXPORT_GUID(gtsam::GaussianMixture, "gtsam_GaussianMixture")
+// BOOST_CLASS_EXPORT_GUID(gtsam::GaussianMixture::Conditionals,
+//                         "gtsam_GaussianMixture_Conditionals")
+
+/* ****************************************************************************/
+// Test HybridGaussianFactor serialization.
+TEST(HybridSerialization, HybridGaussianFactor) {
+  const HybridGaussianFactor factor(JacobianFactor(X(0), I_3x3, Z_3x1));
+
+  EXPECT(equalsObj<HybridGaussianFactor>(factor));
+  EXPECT(equalsXML<HybridGaussianFactor>(factor));
+  EXPECT(equalsBinary<HybridGaussianFactor>(factor));
+}
+
+/* ****************************************************************************/
+// Test HybridDiscreteFactor serialization.
+TEST(HybridSerialization, HybridDiscreteFactor) {
+  DiscreteKeys discreteKeys{{M(0), 2}};
+  const HybridDiscreteFactor factor(
+      DecisionTreeFactor(discreteKeys, std::vector<double>{0.4, 0.6}));
+
+  EXPECT(equalsObj<HybridDiscreteFactor>(factor));
+  EXPECT(equalsXML<HybridDiscreteFactor>(factor));
+  EXPECT(equalsBinary<HybridDiscreteFactor>(factor));
+}
+
+/* ****************************************************************************/
+// Test GaussianMixtureFactor serialization.
+TEST(HybridSerialization, GaussianMixtureFactor) {
+  KeyVector continuousKeys{X(0)};
+  DiscreteKeys discreteKeys{{M(0), 2}};
+
+  auto A = Matrix::Zero(2, 1);
+  auto b0 = Matrix::Zero(2, 1);
+  auto b1 = Matrix::Ones(2, 1);
+  auto f0 = boost::make_shared<JacobianFactor>(X(0), A, b0);
+  auto f1 = boost::make_shared<JacobianFactor>(X(0), A, b1);
+  std::vector<GaussianFactor::shared_ptr> factors{f0, f1};
+
+  const GaussianMixtureFactor factor(continuousKeys, discreteKeys, factors);
+
+  EXPECT(equalsObj<GaussianMixtureFactor>(factor));
+  EXPECT(equalsXML<GaussianMixtureFactor>(factor));
+  EXPECT(equalsBinary<GaussianMixtureFactor>(factor));
+}
+
+/* ************************************************************************* */
+int main() {
+  TestResult tr;
+  return TestRegistry::runAllTests(tr);
+}
+/* ************************************************************************* */