diff --git a/libgraphtheory/fileformats/tgf/autotests/testtgffileformat.cpp b/libgraphtheory/fileformats/tgf/autotests/testtgffileformat.cpp
index e64da5a4..9bd7da5f 100644
--- a/libgraphtheory/fileformats/tgf/autotests/testtgffileformat.cpp
+++ b/libgraphtheory/fileformats/tgf/autotests/testtgffileformat.cpp
@@ -1,93 +1,95 @@
 /*
  *  Copyright 2012-2014  Andreas Cord-Landwehr <cordlandwehr@kde.org>
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2.1 of the License, or (at your option) version 3, or any
  *  later version accepted by the membership of KDE e.V. (or its
  *  successor approved by the membership of KDE e.V.), which shall
  *  act as a proxy defined in Section 6 of version 3 of the license.
  *
  *  This library 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
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "testtgffileformat.h"
 #include "../tgffileformat.h"
 #include "fileformats/fileformatinterface.h"
 #include "graphdocument.h"
 #include "node.h"
 #include "edge.h"
 #include <QtTest>
 
 using namespace GraphTheory;
 
 TestTgfFileFormat::TestTgfFileFormat()
 {
 }
 
 void TestTgfFileFormat::serializeUnserializeTest()
 {
     GraphDocumentPtr document = GraphDocument::create();
+    QCOMPARE(document->edgeTypes().first()->direction(), EdgeType::Direction::Unidirectional);
+    
     document->nodeTypes().first()->addDynamicProperty("label");
     document->edgeTypes().first()->addDynamicProperty("label");
     QMap<QString, NodePtr> dataList;
 
     // Creates a simple Graph with 5 data elements and connect them with pointers.
     dataList.insert("a", Node::create(document));
     dataList["a"]->setDynamicProperty("label", "first node");
     dataList.insert("b", Node::create(document));
     dataList["b"]->setDynamicProperty("label", "b");
     dataList.insert("c", Node::create(document));
     dataList["c"]->setDynamicProperty("label", "c");
     dataList.insert("d", Node::create(document));
     dataList["d"]->setDynamicProperty("label", "d");
     dataList.insert("e", Node::create(document));
     dataList["e"]->setDynamicProperty("label", "e");
 
     Edge::create(dataList["a"], dataList["b"])->setDynamicProperty("label", "test value");
     Edge::create(dataList["b"], dataList["c"]);
     Edge::create(dataList["c"], dataList["d"]);
     Edge::create(dataList["d"], dataList["e"]);
     Edge::create(dataList["e"], dataList["a"]);
 
     // create exporter plugin
     TgfFileFormat serializer(this, QList<QVariant>());
     serializer.setFile(QUrl::fromLocalFile("test.tgf"));
     serializer.writeFile(document);
     QVERIFY(serializer.hasError() == false);
 
     // create importer
     TgfFileFormat importer(this, QList<QVariant>());
     importer.setFile(QUrl::fromLocalFile("test.tgf"));
     importer.readFile();
     QVERIFY(importer.hasError() == false);
     QVERIFY(importer.isGraphDocument());
     document = importer.graphDocument();
 
     // test imported values
     QVERIFY2(document->nodes().size() == 5, "ERROR: Number of data is not 5 ");
     QVERIFY2(document->edges().size() == 5, "ERROR: Number of pointers is not 5 ");
     foreach(NodePtr node, document->nodes()) {
         qDebug() << "Node" << node->dynamicProperty("label");
         for(const auto& e : node->outEdges()) {
             qDebug() << ".. out" << e->from()->dynamicProperty("label") << e->to()->dynamicProperty("label");
         }
         for(const auto& e : node->inEdges()) {
             qDebug() << ".. in " << e->from()->dynamicProperty("label") << e->to()->dynamicProperty("label");
         }
         QCOMPARE(node->outEdges().size(), 1);
         QCOMPARE(node->inEdges().size(), 1);
         QCOMPARE(node->edges().count(), 2);
     }
     QCOMPARE(document->nodes().first()->dynamicProperty("label").toString(), QString("first node"));
     QCOMPARE(document->edges().first()->dynamicProperty("label").toString(), QString("test value"));
 }
 
 QTEST_MAIN(TestTgfFileFormat);