diff --git a/addons/cetmix_tower_server/tests/test_tools.py b/addons/cetmix_tower_server/tests/test_tools.py
new file mode 100644
index 0000000..98cd545
--- /dev/null
+++ b/addons/cetmix_tower_server/tests/test_tools.py
@@ -0,0 +1,38 @@
+from odoo.tests import common
+
+from ..models.tools import CHARS, generate_random_id
+
+
+class TestTools(common.TransactionCase):
+    """Test class for tools module."""
+
+    def test_generate_random_id(self):
+        """Test random id generation"""
+        # Test single section
+        result = generate_random_id()
+        self.assertEqual(len(result), 4)  # Default length is 4
+        self.assertTrue(all(c in CHARS for c in result))  # All chars from CHARS
+
+        # Test multiple sections
+        result = generate_random_id(sections=2)
+        sections = result.split("-")
+        self.assertEqual(len(sections), 2)
+        self.assertTrue(all(len(s) == 4 for s in sections))
+        self.assertTrue(all(c in CHARS for s in sections for c in s))
+
+        # Test custom population
+        result = generate_random_id(population=6)
+        self.assertEqual(len(result), 6)
+
+        # Test custom separator
+        result = generate_random_id(sections=2, separator="_")
+        self.assertIn("_", result)
+        self.assertEqual(len(result.split("_")), 2)
+
+        # Test invalid inputs
+        self.assertIsNone(generate_random_id(sections=0))
+        self.assertIsNone(generate_random_id(population=-1))
+
+        # Test empty separator
+        result = generate_random_id(sections=3, separator="")
+        self.assertEqual(len(result), 12)  # 3 sections of 4 chars with no separator