Add unit test for VRF termination WF

test/workflows/vrf/test_terminate_vrf.py

+import pytest
+from pydantic_forms.exceptions import FormValidationError
+
+from gso.products.product_types.router import Router
+from gso.products.product_types.vrf import VRF
+from test.workflows import assert_complete, extract_state, run_workflow
+
+
+@pytest.mark.workflow()
+def test_terminate_vrf_success(vrf_subscription_factory, faker):
+    subscription_id = vrf_subscription_factory()
+    initial_vrf_data = [{"subscription_id": subscription_id}, {"tt_number": faker.tt_number()}]
+    result, _, _ = run_workflow("terminate_vrf", initial_vrf_data)
+    assert_complete(result)
+
+    state = extract_state(result)
+    subscription_id = state["subscription_id"]
+    subscription = VRF.from_subscription(subscription_id)
+    assert subscription.status == "terminated"
+
+
+@pytest.mark.workflow()
+def test_terminate_vrf_with_router_list(vrf_subscription_factory, faker, router_subscription_factory):
+    subscription_id = vrf_subscription_factory()
+    subscription = VRF.from_subscription(subscription_id)
+    router = Router.from_subscription(router_subscription_factory())
+    subscription.vrf.vrf_router_list = [router.router]
+    subscription.save()
+    initial_vrf_data = [{"subscription_id": subscription_id}, {"tt_number": faker.tt_number()}]
+
+    with pytest.raises(
+        FormValidationError,
+        match="VRF must not have any routers assigned to it before it can be "
+        "deleted. Please remove all routers from the VRF first.",
+    ):
+        run_workflow("terminate_vrf", initial_vrf_data)