Add tests

tests/models/test_invitation.py

@@ -0,0 +1,23 @@
+import pytest
+import datetime
+
+from atst.models.invitation import Invitation, Status
+
+from tests.factories import InvitationFactory
+
+
+def test_expired_invite_is_not_revokable():
+    invite = InvitationFactory.create(
+        expiration_time=datetime.datetime.now() - datetime.timedelta(minutes=60)
+    )
+    assert not invite.is_revokable
+
+
+def test_unexpired_invite_is_revokable():
+    invite = InvitationFactory.create()
+    assert invite.is_revokable
+
+
+def test_invite_is_not_revokable_if_invite_is_not_pending():
+    invite = InvitationFactory.create(status=Status.ACCEPTED)
+    assert not invite.is_revokable