Trying to fix the damn VS2010 issues with the unittests.

git-svn-id: http://www.openvolumemesh.org/svnrepo/OpenVolumeMesh/trunk@218 66977474-1d4b-4f09-8fe9-267525286df2

src/Unittests/unittests_basics.hh

@@ -549,7 +549,7 @@ TEST_F(PolyhedralMeshBase, VolumeMeshNormals) {
     normals.update_face_normals();
 
     // Should be positive z-axis
-    Vec3d n = normals[FaceHandle(0)];
+    Vec3d& n = normals[FaceHandle(0)];
     EXPECT_DOUBLE_EQ(n_z[0], n[0]);
     EXPECT_DOUBLE_EQ(n_z[1], n[1]);
     EXPECT_DOUBLE_EQ(n_z[2], n[2]);