diff --git a/api/__init__.py b/api/__init__.py
index e69de29b..745e9089 100644
--- a/api/__init__.py
+++ b/api/__init__.py
@@ -0,0 +1,29 @@
+# -*- mode: python; coding: utf-8 -*-
+# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
+# se veut agnostique au réseau considéré, de manière à être installable en
+# quelques clics.
+#
+# Copyright © 2024  Caroline Canebier
+#
+# This program 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.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+from os.path import dirname, abspath
+from django.conf import settings as django_settings
+
+def load_tests(loader, tests, pattern):
+    """
+    As this is an optionnal app, loads its tests only if it is installed.
+    """
+    if "api" in django_settings.INSTALLED_APPS:
+        return loader.discover(start_dir=dirname(abspath(__file__)), pattern=pattern)
\ No newline at end of file
diff --git a/deposits/__init__.py b/deposits/__init__.py
index e69de29b..745e9089 100644
--- a/deposits/__init__.py
+++ b/deposits/__init__.py
@@ -0,0 +1,29 @@
+# -*- mode: python; coding: utf-8 -*-
+# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
+# se veut agnostique au réseau considéré, de manière à être installable en
+# quelques clics.
+#
+# Copyright © 2024  Caroline Canebier
+#
+# This program 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.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+from os.path import dirname, abspath
+from django.conf import settings as django_settings
+
+def load_tests(loader, tests, pattern):
+    """
+    As this is an optionnal app, loads its tests only if it is installed.
+    """
+    if "api" in django_settings.INSTALLED_APPS:
+        return loader.discover(start_dir=dirname(abspath(__file__)), pattern=pattern)
\ No newline at end of file
diff --git a/ldap_sync/__init__.py b/ldap_sync/__init__.py
index e69de29b..83cad363 100644
--- a/ldap_sync/__init__.py
+++ b/ldap_sync/__init__.py
@@ -0,0 +1,29 @@
+# -*- mode: python; coding: utf-8 -*-
+# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
+# se veut agnostique au réseau considéré, de manière à être installable en
+# quelques clics.
+#
+# Copyright © 2024  Caroline Canebier
+#
+# This program 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.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+from os.path import dirname, abspath
+from django.conf import settings as django_settings
+
+def load_tests(loader, tests, pattern):
+    """
+    As this is an optionnal app, loads its tests only if it is installed.
+    """
+    if "ldap_sync" in django_settings.INSTALLED_APPS:
+        return loader.discover(start_dir=dirname(abspath(__file__)), pattern=pattern)
\ No newline at end of file
diff --git a/radius/__init__.py b/radius/__init__.py
index e69de29b..745e9089 100644
--- a/radius/__init__.py
+++ b/radius/__init__.py
@@ -0,0 +1,29 @@
+# -*- mode: python; coding: utf-8 -*-
+# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
+# se veut agnostique au réseau considéré, de manière à être installable en
+# quelques clics.
+#
+# Copyright © 2024  Caroline Canebier
+#
+# This program 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.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+from os.path import dirname, abspath
+from django.conf import settings as django_settings
+
+def load_tests(loader, tests, pattern):
+    """
+    As this is an optionnal app, loads its tests only if it is installed.
+    """
+    if "api" in django_settings.INSTALLED_APPS:
+        return loader.discover(start_dir=dirname(abspath(__file__)), pattern=pattern)
\ No newline at end of file
diff --git a/tickets/__init__.py b/tickets/__init__.py
index e69de29b..745e9089 100644
--- a/tickets/__init__.py
+++ b/tickets/__init__.py
@@ -0,0 +1,29 @@
+# -*- mode: python; coding: utf-8 -*-
+# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
+# se veut agnostique au réseau considéré, de manière à être installable en
+# quelques clics.
+#
+# Copyright © 2024  Caroline Canebier
+#
+# This program 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.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+from os.path import dirname, abspath
+from django.conf import settings as django_settings
+
+def load_tests(loader, tests, pattern):
+    """
+    As this is an optionnal app, loads its tests only if it is installed.
+    """
+    if "api" in django_settings.INSTALLED_APPS:
+        return loader.discover(start_dir=dirname(abspath(__file__)), pattern=pattern)
\ No newline at end of file