Add test to ensure parity between 02-networking-[vpn/peering]

tests/fast/stages/s02_networking_peering/test_plan.py

@@ -12,9 +12,36 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from pathlib import Path
+
+from deepdiff import DeepDiff
+
+BASEDIR = Path(__file__).parent
+FIXTURE_PEERING = BASEDIR / 'fixture'
+FIXTURE_VPN = BASEDIR.parent / 's02_networking_vpn/fixture'
+
 
 def test_counts(fast_e2e_plan_runner):
-  "Test stage."
+  'Test stage.'
   num_modules, num_resources, _ = fast_e2e_plan_runner()
   # TODO: to re-enable per-module resource count check print _, then test
   assert num_modules > 0 and num_resources > 0
+
+
+def test_vpn_peering_parity(e2e_plan_runner):
+  '''Ensure VPN- and peering-based networking stages are identical except
+  for VPN and VPC peering resources'''
+  _, plan_peering = e2e_plan_runner(fixture_path=FIXTURE_PEERING)
+  _, plan_vpn = e2e_plan_runner(fixture_path=FIXTURE_VPN)
+  ddiff = DeepDiff(plan_vpn, plan_peering, ignore_order=True,
+                   group_by='address', view='tree')
+
+  removed_types = {x.t1['type'] for x in ddiff['dictionary_item_removed']}
+  added_types = {x.t2['type'] for x in ddiff['dictionary_item_added']}
+
+  assert added_types == {'google_compute_network_peering'}
+  assert removed_types == {
+      'google_compute_ha_vpn_gateway', 'google_compute_router',
+      'google_compute_router_interface', 'google_compute_router_peer',
+      'google_compute_vpn_tunnel', 'random_id'
+  }