diff --git a/backend/tests/projects/toolmodels/test_toolmodel_routes.py b/backend/tests/projects/toolmodels/test_toolmodel_routes.py
new file mode 100644
index 0000000000..6b4172859e
--- /dev/null
+++ b/backend/tests/projects/toolmodels/test_toolmodel_routes.py
@@ -0,0 +1,139 @@
+# SPDX-FileCopyrightText: Copyright DB Netz AG and the capella-collab-manager contributors
+# SPDX-License-Identifier: Apache-2.0
+
+
+from unittest import mock
+
+import pytest
+from fastapi import testclient
+from sqlalchemy import orm
+
+from capellacollab.__main__ import app
+from capellacollab.projects import injectables as projects_injectables
+from capellacollab.projects import models as projects_models
+from capellacollab.projects.toolmodels import (
+    injectables as toolmodels_injectables,
+)
+from capellacollab.projects.toolmodels import models as toolmodels_models
+from capellacollab.users import crud as users_crud
+from capellacollab.users import models as users_models
+
+
+@pytest.fixture(name="mock_tool")
+def fixture_mock_tool():
+    mock_tool = mock.Mock(name="tool")
+    mock_tool.name = "test"
+
+    return mock_tool
+
+
+@pytest.fixture(name="override_dependency")
+def fixture_override_dependency(mock_tool):
+    mock_project = mock.Mock(name="DatabaseProject")
+
+    mock_model = mock.Mock(name="DatabaseModel")
+    mock_model.slug = "any-slug"
+    mock_model.tool = mock_tool
+
+    app.dependency_overrides[
+        projects_injectables.get_existing_project
+    ] = lambda: mock_project
+    app.dependency_overrides[
+        toolmodels_injectables.get_existing_capella_model
+    ] = lambda: mock_model
+
+    yield
+
+    del app.dependency_overrides[projects_injectables.get_existing_project]
+    del app.dependency_overrides[
+        toolmodels_injectables.get_existing_capella_model
+    ]
+
+
+# @pytest.mark.usefixtures("override_dependency")
+# def test_rename_toolmodel_successful(
+#     mock_tool,
+#     capella_model,
+#     client: testclient.TestClient,
+#     executor_name: str,
+#     db: orm.Session,
+# ):
+#     users_crud.create_user(db, executor_name, users_models.Role.ADMIN)
+
+#     with mock.patch(
+#         "capellacollab.projects.toolmodels.crud.get_model_by_slugs",
+#         autospec=True,
+#     ) as mock_get_model_by_slugs, mock.patch(
+#         "capellacollab.projects.toolmodels.crud.update_model", autospec=True
+#     ) as mock_update_model, mock.patch(
+#         "capellacollab.projects.toolmodels.routes.get_version_by_id_or_raise",
+#         autospec=True,
+#     ) as mock_get_version_by_id_or_raise, mock.patch(
+#         "capellacollab.projects.toolmodels.routes.get_nature_by_id_or_raise",
+#         autospec=True,
+#     ) as mock_get_nature_by_id_or_raise:
+#         mock_get_model_by_slugs.return_value = None
+#         mock_update_model.return_value = capella_model
+
+#         mock_version = mock.Mock(name="versions")
+#         mock_version.tool = mock_tool
+#         mock_get_version_by_id_or_raise.return_value = mock_version
+
+#         mock_nature = mock.Mock(name="types")
+#         mock_nature.tool = mock_tool
+#         mock_get_nature_by_id_or_raise.return_value = mock_nature
+
+#         response = client.patch(
+#             "/api/v1/projects/any/models/any",
+#             json={"name": "new-name", "version_id": -1, "nature_id": -1},
+#         )
+
+#         assert response.status_code == 200
+#         mock_get_model_by_slugs.assert_called_once()
+#         mock_update_model.assert_called_once()
+
+
+def test_rename_toolmodel_successful(
+    capella_model: toolmodels_models.DatabaseCapellaModel,
+    project: projects_models.DatabaseProject,
+    client: testclient.TestClient,
+    executor_name: str,
+    db: orm.Session,
+):
+    users_crud.create_user(db, executor_name, users_models.Role.ADMIN)
+
+    response = client.patch(
+        f"/api/v1/projects/{project.slug}/models/{capella_model.slug}",
+        json={
+            "name": "new-name",
+            "version_id": capella_model.tool.versions[0].id,
+            "nature_id": capella_model.tool.natures[0].id,
+        },
+    )
+
+    assert response.status_code == 200
+    assert "new-name" in response.text
+
+
+@pytest.mark.usefixtures("override_dependency")
+def test_rename_toolmodel_where_name_already_exists(
+    client: testclient.TestClient,
+    executor_name: str,
+    db: orm.Session,
+):
+    users_crud.create_user(db, executor_name, users_models.Role.ADMIN)
+
+    with mock.patch(
+        "capellacollab.projects.toolmodels.crud.get_model_by_slugs",
+        autospec=True,
+    ) as mock_get_model_by_slugs:
+        mock_get_model_by_slugs.return_value = "anything"
+
+        response = client.patch(
+            "/api/v1/projects/any/models/any",
+            json={"name": "new-name", "version_id": -1, "nature_id": -1},
+        )
+
+        assert response.status_code == 409
+        assert "A model with a similar name already exists" in response.text
+        mock_get_model_by_slugs.assert_called_once()