diff --git a/golem_season/tests/__init__.py b/golem_season/tests/__init__.py
new file mode 100644
index 0000000..c008a6b
--- /dev/null
+++ b/golem_season/tests/__init__.py
@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+
+#    Copyright 2016 Fabien Bourgeois <fabien@yaltik.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from . import test_golem_season
diff --git a/golem_season/tests/test_golem_season.py b/golem_season/tests/test_golem_season.py
new file mode 100644
index 0000000..cad7165
--- /dev/null
+++ b/golem_season/tests/test_golem_season.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+
+#    Copyright 2016 Fabien Bourgeois <fabien@yaltik.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from openerp.tests.common import TransactionCase
+from openerp.models import ValidationError
+
+
+class GolemSeasonTestCase(TransactionCase):
+
+    def setUp(self):
+        super(GolemSeasonTestCase, self).setUp()
+        self.season_model = self.env['golem.season'].sudo()
+
+    def test_season_default(self):
+        """ Test uniqueness of default season """
+        first = self.season_model.create({'name': u'First'})
+        self.assertTrue(first.is_default)
+        second = self.season_model.create({'name': u'Second'})
+        self.assertFalse(second.is_default)
+        second.do_default_season()
+        self.assertTrue(second.is_default)
+        self.assertFalse(first.is_default)
+
+    def test_check_period(self):
+        """ Tests constraints on periods """
+        old = self.season_model.create({'name': 'Valid',
+                                        'date_start': '2010-01-01',
+                                        'date_end': '2010-12-31'})
+        self.assertTrue(old.date_end > old.date_start)
+        with self.assertRaises(ValidationError):
+            old.write({'date_start': '2011-01-01'})
+        with self.assertRaises(ValidationError):
+            self.season_model.create({'name': 'Conflict for start',
+                                      'date_start': '2010-11-01',
+                                      'date_end': '2011-12-31'})
+        with self.assertRaises(ValidationError):
+            self.season_model.create({'name': 'Conflict : include existing',
+                                      'date_start': '2009-11-01',
+                                      'date_end': '2011-12-31'})