Add context support to vlan-attachments (#3787)

tests/modules/net-vlan-attachment/context.tfvars

@@ -0,0 +1,35 @@
+context = {
+  locations = {
+    my_region = "europe-west1"
+  }
+  networks = {
+    my_network = "projects/my-project/global/networks/my-network"
+  }
+  project_ids = {
+    my_project = "my-project"
+  }
+  routers = {
+    my_router = "my-router"
+  }
+}
+
+dedicated_interconnect_config = {
+  bandwidth    = "BPS_100G"
+  bgp_range    = "169.254.1.0/29"
+  bgp_priority = 100
+  interconnect = "projects/my-project/global/interconnects/my-interconnect"
+  vlan_tag     = 100
+}
+
+description = "test attachment"
+name        = "test-attachment"
+peer_asn    = "65534"
+
+network    = "$networks:my_network"
+project_id = "$project_ids:my_project"
+region     = "$locations:my_region"
+
+router_config = {
+  create = false
+  name   = "$routers:my_router"
+}

tests/modules/net-vlan-attachment/context.yaml

@@ -0,0 +1,85 @@
+# Copyright 2025 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.
+
+values:
+  google_compute_interconnect_attachment.default:
+    admin_enabled: true
+    bandwidth: BPS_100G
+    candidate_cloud_router_ip_address: null
+    candidate_cloud_router_ipv6_address: null
+    candidate_customer_router_ip_address: null
+    candidate_customer_router_ipv6_address: null
+    candidate_subnets:
+    - 169.254.1.0/29
+    description: test attachment
+    effective_labels:
+      goog-terraform-provisioned: 'true'
+    encryption: NONE
+    interconnect: projects/my-project/global/interconnects/my-interconnect
+    ipsec_internal_addresses: null
+    l2_forwarding: []
+    labels: null
+    mtu: '1500'
+    name: test-attachment
+    project: my-project
+    region: europe-west1
+    router: my-router
+    subnet_length: null
+    terraform_labels:
+      goog-terraform-provisioned: 'true'
+    timeouts: null
+    type: DEDICATED
+    vlan_tag8021q: 100
+  google_compute_router_interface.default[0]:
+    name: test-attachment-intf
+    private_ip_address: null
+    project: my-project
+    region: europe-west1
+    router: my-router
+    subnetwork: null
+    timeouts: null
+    vpn_tunnel: null
+  google_compute_router_peer.default[0]:
+    advertise_mode: CUSTOM
+    advertised_groups: null
+    advertised_ip_ranges: []
+    advertised_route_priority: 100
+    custom_learned_ip_ranges: []
+    custom_learned_route_priority: null
+    enable: true
+    enable_ipv6: false
+    export_policies: null
+    import_policies: null
+    interface: test-attachment-intf
+    md5_authentication_key: []
+    name: test-attachment-peer
+    peer_asn: 65534
+    project: my-project
+    region: europe-west1
+    router: my-router
+    router_appliance_instance: null
+    timeouts: null
+    zero_advertised_route_priority: null
+    zero_custom_learned_route_priority: false
+  random_id.secret:
+    byte_length: 12
+    keepers: null
+    prefix: null
+
+counts:
+  google_compute_interconnect_attachment: 1
+  google_compute_router_interface: 1
+  google_compute_router_peer: 1
+  modules: 0
+  random_id: 1

tests/modules/net-vlan-attachment/tftest.yaml

@@ -0,0 +1,17 @@
+# Copyright 2025 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: modules/net-vlan-attachment
+tests:
+  context: