Add end-to-end tests for net-address

tests/fixtures/net-vpc-ipv6.tf

@@ -0,0 +1,40 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+module "vpc" {
+  source     = "./fabric/modules/net-vpc"
+  project_id = var.project_id
+  name       = "fixture-net-vpc-external"
+  ipv6_config = {
+    enable_ula_internal = true
+  }
+  subnets = [
+    {
+      ip_cidr_range = "192.168.0.0/24"
+      name          = "ipv6-external"
+      region        = var.region
+      ipv6 = {
+        access_type = "EXTERNAL"
+      }
+    },
+    {
+      ip_cidr_range = "192.168.1.0/24"
+      name          = "ipv6-internal"
+      region        = var.region
+      ipv6 = {
+        access_type = "INTERNAL"
+      }
+    },
+  ]
+}