Increase the coverage (include/dynamic-graph/Entity.h -> 100%)

Add on test/Entity.h the virtual function (Entity::getClassName)

Signed-off-by: Bergé <corentin.berge@outlook.fr>

tests/custom-entity.cpp

@@ -50,8 +50,8 @@ BOOST_AUTO_TEST_CASE (constructor)
     dynamicgraph::FactoryStorage::getInstance()->
     newEntity("CustomEntity", "my-entity");
   BOOST_CHECK_EQUAL (entity->getName (), "my-entity");
+  BOOST_CHECK_EQUAL (entity->Entity::getClassName (), "Entity");
   BOOST_CHECK_EQUAL (entity->getClassName (), CustomEntity::CLASS_NAME);
-
   //CustomEntity entity2 ("");
   // Deregister entities before destroying them
   dynamicgraph::PoolStorage::destroy();