diff --git a/tests/integration/models/oui_test.py b/tests/integration/models/oui_test.py
new file mode 100644
index 0000000000..ee3364b419
--- /dev/null
+++ b/tests/integration/models/oui_test.py
@@ -0,0 +1,21 @@
+import pytest
+
+from nav.models.oui import OUI
+
+
+class TestOUI:
+    def test_should_give_error_if_less_than_6_characters(self):
+        with pytest.raises(ValueError):
+            OUI(oui="AABB", vendor="myvendor")
+
+    def test_should_give_error_if_morethan_6_characters(self):
+        with pytest.raises(ValueError):
+            OUI(oui="AABBCCDD", vendor="myvendor")
+
+    def test_should_allow_oid_with_6_characters(self):
+        OUI(oui="AABBCC", vendor="myvendor")
+
+    def test_string_representation_should_match_oid(self):
+        oui_string = "AABBCC"
+        oui = OUI(oui=oui_string, vendor="myvendor")
+        assert str(oui) == oui_string