Add unit tests for imported products

Added unit tests for the imported_* products: both the create_imported_* and import_* workflows are now tested, and the fixtures have been updated so these kinds of products can now also be used in other tests.

Test coverage up from ~80% to 92%

test/workflows/router/test_create_imported_router.py

+import pytest
+from orchestrator.types import SubscriptionLifecycle
+
+from gso.products.product_blocks.router import RouterRole
+from gso.products.product_types.router import ImportedRouter
+from gso.products.product_types.site import Site
+from gso.utils.helpers import iso_from_ipv4
+from gso.utils.shared_enums import Vendor
+from test.workflows import assert_complete, extract_state, run_workflow
+
+
+@pytest.fixture()
+def imported_router_creation_input_form_data(site_subscription_factory, faker):
+    router_site = site_subscription_factory()
+    fake_v4 = faker.ipv4()
+
+    return {
+        "partner": "GEANT",
+        "router_site": Site.from_subscription(router_site).site.site_name,
+        "hostname": faker.pystr(),
+        "ts_port": faker.pyint(),
+        "router_role": faker.random_choices(elements=(RouterRole.P, RouterRole.PE, RouterRole.AMT), length=1)[0],
+        "router_vendor": faker.random_choices(elements=(Vendor.NOKIA, Vendor.JUNIPER), length=1)[0],
+        "router_lo_ipv4_address": fake_v4,
+        "router_lo_ipv6_address": faker.ipv6(),
+        "router_lo_iso_address": iso_from_ipv4(fake_v4),
+    }
+
+
+def test_create_imported_router_success(faker, imported_router_creation_input_form_data):
+    result, _, _ = run_workflow("create_imported_router", [imported_router_creation_input_form_data])
+    state = extract_state(result)
+    subscription = ImportedRouter.from_subscription(state["subscription_id"])
+    assert_complete(result)
+    assert subscription.status == SubscriptionLifecycle.ACTIVE