Index: src/Fragmentation/Homology/unittests/FragmentEdgeUnitTest.cpp
===================================================================
--- src/Fragmentation/Homology/unittests/FragmentEdgeUnitTest.cpp	(revision 8387e06f968d381b3fce254b7726ba0d11c5a748)
+++ src/Fragmentation/Homology/unittests/FragmentEdgeUnitTest.cpp	(revision 8387e06f968d381b3fce254b7726ba0d11c5a748)
@@ -0,0 +1,135 @@
+/*
+ * Project: MoleCuilder
+ * Description: creates and alters molecular systems
+ * Copyright (C)  2012 University of Bonn. All rights reserved.
+ * 
+ *
+ *   This file is part of MoleCuilder.
+ *
+ *    MoleCuilder is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    MoleCuilder is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with MoleCuilder.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * FragmentEdgeUnitTest.cpp
+ *
+ *  Created on: Sep 24, 2012
+ *      Author: heber
+ */
+
+// include config.h
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+using namespace std;
+
+#include <cppunit/CompilerOutputter.h>
+#include <cppunit/extensions/TestFactoryRegistry.h>
+#include <cppunit/ui/text/TestRunner.h>
+
+// include headers that implement a archive in simple text format
+#include <boost/archive/text_oarchive.hpp>
+#include <boost/archive/text_iarchive.hpp>
+
+#include "Fragmentation/Homology/FragmentEdge.hpp"
+
+#include "FragmentEdgeUnitTest.hpp"
+
+#include "CodePatterns/Assert.hpp"
+
+#ifdef HAVE_TESTRUNNER
+#include "UnitTestMain.hpp"
+#endif /*HAVE_TESTRUNNER*/
+
+/********************************************** Test classes **************************************/
+
+// Registers the fixture into the 'registry'
+CPPUNIT_TEST_SUITE_REGISTRATION( FragmentEdgeTest );
+
+
+void FragmentEdgeTest::setUp()
+{
+  // failing asserts should be thrown
+  ASSERT_DO(Assert::Throw);
+}
+
+
+void FragmentEdgeTest::tearDown()
+{
+}
+
+/** UnitTest for operator<(), operator>() and operator==()
+ */
+void FragmentEdgeTest::comparatorTest()
+{
+  FragmentEdge edge(1,1);
+  FragmentEdge sameedge(1,1);
+  FragmentEdge otheredge(1,4);
+  FragmentEdge anotheredge(2,2);
+  FragmentEdge yetanotheredge(2,4);
+
+  CPPUNIT_ASSERT( !(edge < sameedge) );
+  CPPUNIT_ASSERT( edge < otheredge );
+  CPPUNIT_ASSERT( edge < anotheredge );
+  CPPUNIT_ASSERT( edge < yetanotheredge );
+  CPPUNIT_ASSERT( otheredge < anotheredge );
+  CPPUNIT_ASSERT( otheredge < yetanotheredge );
+  CPPUNIT_ASSERT( anotheredge < yetanotheredge );
+
+  CPPUNIT_ASSERT( !(edge > sameedge) );
+  CPPUNIT_ASSERT( otheredge > edge );
+  CPPUNIT_ASSERT( anotheredge > edge );
+  CPPUNIT_ASSERT( anotheredge > otheredge );
+  CPPUNIT_ASSERT( yetanotheredge > edge );
+  CPPUNIT_ASSERT( yetanotheredge > otheredge );
+  CPPUNIT_ASSERT( yetanotheredge > anotheredge );
+
+  CPPUNIT_ASSERT( edge == edge );
+  CPPUNIT_ASSERT( edge == sameedge );
+  CPPUNIT_ASSERT( otheredge == otheredge );
+  CPPUNIT_ASSERT( anotheredge == anotheredge );
+  CPPUNIT_ASSERT( yetanotheredge == yetanotheredge );
+
+  CPPUNIT_ASSERT( edge != otheredge );
+  CPPUNIT_ASSERT( edge != anotheredge );
+  CPPUNIT_ASSERT( edge != yetanotheredge );
+  CPPUNIT_ASSERT( otheredge != anotheredge );
+  CPPUNIT_ASSERT( otheredge != yetanotheredge );
+  CPPUNIT_ASSERT( anotheredge != yetanotheredge );
+}
+
+/** UnitTest for operator=()
+ */
+void FragmentEdgeTest::assignmentTest()
+{
+  FragmentEdge edge(1,1);
+  FragmentEdge sameedge(1,1);
+  FragmentEdge otheredge(1,4);
+
+  // check initial status
+  CPPUNIT_ASSERT( edge == sameedge);
+  CPPUNIT_ASSERT( edge != otheredge);
+
+  // now assign
+  sameedge = otheredge;
+  otheredge = edge;
+
+  // and check again
+  CPPUNIT_ASSERT( edge != sameedge);
+  CPPUNIT_ASSERT( edge == otheredge);
+
+  // also self-assign
+  edge = edge;
+  CPPUNIT_ASSERT( edge == edge);
+}
