diff --git a/test/gtest_factor_gnss_displacement_2d.cpp b/test/gtest_factor_gnss_displacement_2d.cpp
index 433ae69c1c4b4d3b9a3148a763c57749caef58a2..fe5d9e7e8931e81f376d4621fccd27c65102552f 100644
--- a/test/gtest_factor_gnss_displacement_2d.cpp
+++ b/test/gtest_factor_gnss_displacement_2d.cpp
@@ -1,3 +1,22 @@
+// WOLF - Copyright (C) 2020,2021,2022,2023
+// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
+// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
+// Joan Vallvé Navarro (jvallve@iri.upc.edu)
+// All rights reserved.
+//
+// This file is part of WOLF.
+// WOLF 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 3 of the License, or
+// at your option) any later version.
+//
+// This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 // WOLF - Copyright (C) 2020,2021,2022 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
 // Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
 // Joan Vallvé Navarro (jvallve@iri.upc.edu)
diff --git a/test/gtest_factor_gnss_displacement_3d.cpp b/test/gtest_factor_gnss_displacement_3d.cpp
index f4fd580e3394ee3cc00023f0906eeffc741f8799..2384ca4977d36d8aadd284ab9c0260b6eb7c3939 100644
--- a/test/gtest_factor_gnss_displacement_3d.cpp
+++ b/test/gtest_factor_gnss_displacement_3d.cpp
@@ -1,3 +1,22 @@
+// WOLF - Copyright (C) 2020,2021,2022,2023
+// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
+// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
+// Joan Vallvé Navarro (jvallve@iri.upc.edu)
+// All rights reserved.
+//
+// This file is part of WOLF.
+// WOLF 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 3 of the License, or
+// at your option) any later version.
+//
+// This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 // WOLF - Copyright (C) 2020,2021,2022 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
 // Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
 // Joan Vallvé Navarro (jvallve@iri.upc.edu)
diff --git a/test/gtest_factor_gnss_displacement_3d_with_clock.cpp b/test/gtest_factor_gnss_displacement_3d_with_clock.cpp
index 7d87c2d51f6faee177103e43caffe3430dbe244b..bc10050a09709508485c06aeae4954416e3a5802 100644
--- a/test/gtest_factor_gnss_displacement_3d_with_clock.cpp
+++ b/test/gtest_factor_gnss_displacement_3d_with_clock.cpp
@@ -1,3 +1,22 @@
+// WOLF - Copyright (C) 2020,2021,2022,2023
+// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
+// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
+// Joan Vallvé Navarro (jvallve@iri.upc.edu)
+// All rights reserved.
+//
+// This file is part of WOLF.
+// WOLF 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 3 of the License, or
+// at your option) any later version.
+//
+// This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 // WOLF - Copyright (C) 2020,2021,2022 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
 // Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
 // Joan Vallvé Navarro (jvallve@iri.upc.edu)