diff --git a/tests/app/conftest.py b/tests/app/conftest.py
index 13e0c0b09..249dcdcf8 100644
--- a/tests/app/conftest.py
+++ b/tests/app/conftest.py
@@ -556,6 +556,27 @@ def sample_invited_user(notify_db_session):
     return invited_user
 
 
+@pytest.fixture(scope="function")
+def sample_expired_user(notify_db_session):
+    service = create_service(check_if_service_exists=True)
+    to_email_address = "expired_user@digital.fake.gov"
+
+    from_user = service.users[0]
+
+    data = {
+        "service": service,
+        "email_address": to_email_address,
+        "from_user": from_user,
+        "permissions": "send_messages,manage_service,manage_api_keys",
+        "folder_permissions": ["folder_1_id", "folder_2_id"],
+        "created_at": datetime.utcnow() - timedelta(days=3),
+        "status": "expired",
+    }
+    expired_user = InvitedUser(**data)
+    save_invited_user(expired_user)
+    return expired_user
+
+
 @pytest.fixture(scope="function")
 def sample_invited_org_user(sample_user, sample_organization):
     return create_invited_org_user(sample_organization, sample_user)
diff --git a/tests/app/service_invite/test_service_invite_rest.py b/tests/app/service_invite/test_service_invite_rest.py
index 595303bc8..80d32a3e4 100644
--- a/tests/app/service_invite/test_service_invite_rest.py
+++ b/tests/app/service_invite/test_service_invite_rest.py
@@ -141,7 +141,7 @@ def test_create_invited_user_invalid_email(client, sample_service, mocker, fake_
 def test_get_all_invited_users_by_service(client, notify_db_session, sample_service):
     invites = []
     for i in range(0, 5):
-        email = "invited_user_{}@service.gov.uk".format(i)
+        email = f"invited_user_{i}@service.gov.uk"
         invited_user = create_invited_user(sample_service, to_email_address=email)
         invites.append(invited_user)
 
@@ -202,11 +202,24 @@ def test_get_invited_user_by_service_when_user_does_not_belong_to_the_service(
     assert json_resp["result"] == "error"
 
 
+def test_resend_expired_invite(client, sample_expired_user):
+    url = f"/service/{sample_expired_user.service_id}/invite/{sample_expired_user.id}"
+    # TODO: Don't actually send email, need to mock it out.
+    auth_header = create_admin_authorization_header()
+    response = client.post(
+        url,
+        data=json.dumps(data),
+        headers=[("Content-Type", "application/json"), auth_header],
+    )
+
+    assert response.status_code == 200
+    json_resp = json.loads(response.get_data(as_text=True))["data"]
+    assert json_resp["status"] == "cancelled"
+
+
 def test_update_invited_user_set_status_to_cancelled(client, sample_invited_user):
     data = {"status": "cancelled"}
-    url = "/service/{0}/invite/{1}".format(
-        sample_invited_user.service_id, sample_invited_user.id
-    )
+    url = f"/service/{sample_invited_user.service_id}/invite/{sample_invited_user.id}"
     auth_header = create_admin_authorization_header()
     response = client.post(
         url,
@@ -223,7 +236,7 @@ def test_update_invited_user_for_wrong_service_returns_404(
     client, sample_invited_user, fake_uuid
 ):
     data = {"status": "cancelled"}
-    url = "/service/{0}/invite/{1}".format(fake_uuid, sample_invited_user.id)
+    url = f"/service/{fake_uuid}/invite/{sample_invited_user.id}"
     auth_header = create_admin_authorization_header()
     response = client.post(
         url,
@@ -237,9 +250,7 @@ def test_update_invited_user_for_wrong_service_returns_404(
 
 def test_update_invited_user_for_invalid_data_returns_400(client, sample_invited_user):
     data = {"status": "garbage"}
-    url = "/service/{0}/invite/{1}".format(
-        sample_invited_user.service_id, sample_invited_user.id
-    )
+    url = f"/service/{sample_invited_user.service_id}/invite/{sample_invited_user.id}"
     auth_header = create_admin_authorization_header()
     response = client.post(
         url,
@@ -291,7 +302,7 @@ def test_validate_invitation_token_for_expired_token_returns_400(client):
             current_app.config["SECRET_KEY"],
             current_app.config["DANGEROUS_SALT"],
         )
-    url = "/invite/service/{}".format(token)
+    url = f"/invite/service/{token}"
     auth_header = create_admin_authorization_header()
     response = client.get(
         url, headers=[("Content-Type", "application/json"), auth_header]
@@ -312,7 +323,7 @@ def test_validate_invitation_token_returns_400_when_invited_user_does_not_exist(
         current_app.config["SECRET_KEY"],
         current_app.config["DANGEROUS_SALT"],
     )
-    url = "/invite/service/{}".format(token)
+    url = f"/invite/service/{token}"
     auth_header = create_admin_authorization_header()
     response = client.get(
         url, headers=[("Content-Type", "application/json"), auth_header]
@@ -331,7 +342,7 @@ def test_validate_invitation_token_returns_400_when_token_is_malformed(client):
         current_app.config["DANGEROUS_SALT"],
     )[:-2]
 
-    url = "/invite/service/{}".format(token)
+    url = f"/invite/service/{token}"
     auth_header = create_admin_authorization_header()
     response = client.get(
         url, headers=[("Content-Type", "application/json"), auth_header]