diff --git a/cpp/FactorGraph-inl.h b/cpp/FactorGraph-inl.h
index 2b30b983e..d59af0168 100644
--- a/cpp/FactorGraph-inl.h
+++ b/cpp/FactorGraph-inl.h
@@ -12,6 +12,7 @@
 
 #include <list>
 #include <sstream>
+#include <stdexcept>
 #include <boost/foreach.hpp>
 #include <boost/tuple/tuple.hpp>
 #include <colamd/colamd.h>
diff --git a/cpp/Makefile.am b/cpp/Makefile.am
index 63d3e291b..101a6834c 100644
--- a/cpp/Makefile.am
+++ b/cpp/Makefile.am
@@ -64,13 +64,15 @@ example = smallExample.cpp
 headers += inference.h inference-inl.h
 headers += FactorGraph.h FactorGraph-inl.h
 headers += BayesNet.h BayesNet-inl.h BayesTree.h BayesTree-inl.h
-check_PROGRAMS += testFactorgraph testBayesTree testInference  
+check_PROGRAMS += testFactorgraph testBayesTree testInference testIncremental
 testFactorgraph_SOURCES        = testFactorgraph.cpp
 testBayesTree_SOURCES          = $(example) testBayesTree.cpp
 testInference_SOURCES          = $(example) testInference.cpp
+testIncremental_SOURCES        = $(example) testIncremental.cpp
 testFactorgraph_LDADD          = libgtsam.la
 testBayesTree_LDADD            = libgtsam.la
 testInference_LDADD            = libgtsam.la
+testIncremental_LDADD          = libgtsam.la
 
 # Symbolic Inference
 headers += SymbolicConditional.h
diff --git a/cpp/testIncremental.cpp b/cpp/testIncremental.cpp
new file mode 100644
index 000000000..67b65bda8
--- /dev/null
+++ b/cpp/testIncremental.cpp
@@ -0,0 +1,53 @@
+/**
+ * @file    testIncremental.cpp
+ * @brief   Unit tests for graph-based iSAM
+ * @author  Michael Kaess
+ */
+
+#include <boost/assign/std/list.hpp> // for operator +=
+using namespace boost::assign;
+
+#include <CppUnitLite/TestHarness.h>
+
+#include "SymbolicBayesNet.h"
+#include "GaussianBayesNet.h"
+#include "Ordering.h"
+#include "BayesTree-inl.h"
+#include "smallExample.h"
+
+using namespace gtsam;
+
+typedef BayesTree<SymbolicConditional> SymbolicBayesTree;
+typedef BayesTree<GaussianConditional> GaussianBayesTree;
+
+
+
+// todo: copied from testBayesTree
+
+
+// Conditionals for ASIA example from the tutorial with A and D evidence
+SymbolicConditional::shared_ptr B(new SymbolicConditional("B")), L(
+		new SymbolicConditional("L", "B")), E(
+		new SymbolicConditional("E", "L", "B")), S(new SymbolicConditional("S",
+		"L", "B")), T(new SymbolicConditional("T", "E", "L")), X(
+		new SymbolicConditional("X", "E"));
+
+/* ************************************************************************* */
+TEST( BayesTree, Front )
+{
+	SymbolicBayesNet f1;
+	f1.push_back(B);
+	f1.push_back(L);
+	SymbolicBayesNet f2;
+	f2.push_back(L);
+	f2.push_back(B);
+	CHECK(f1.equals(f1));
+	CHECK(!f1.equals(f2));
+}
+
+/* ************************************************************************* */
+int main() {
+	TestResult tr;
+	return TestRegistry::runAllTests(tr);
+}
+/* ************************************************************************* */