Fixed TestAccNetworkServicesGateway_update (#12749)

mmv1/products/networkservices/Gateway.yaml

@@ -48,7 +48,7 @@ async:
 custom_code:
   constants: 'templates/terraform/constants/network_services_gateway.go.tmpl'
   post_delete: 'templates/terraform/post_delete/network_services_gateway.go.tmpl'
-  pre_update: 'templates/terraform/pre_update/network_services_gateway.go.tmpl'
+  update_encoder: 'templates/terraform/update_encoder/network_services_gateway.go.tmpl'
 examples:
   - name: 'network_services_gateway_basic'
     primary_resource_id: 'default'
@@ -147,7 +147,6 @@ properties:
       The proxy binds to the specified ports. Gateways of type 'SECURE_WEB_GATEWAY' are
       limited to 1 port. Gateways of type 'OPEN_MESH' listen on 0.0.0.0 and support multiple ports.
     required: true
-    immutable: true
     item_type:
       type: Integer
   - name: 'scope'

mmv1/templates/terraform/update_encoder/network_services_gateway.go.tmpl

@@ -0,0 +1,8 @@
+// Always force-send some attributes even if they were not modified. This works around extra API-side requirements.
+obj["scope"] = d.Get("scope")
+if d.Get("type") == "SECURE_WEB_GATEWAY" {
+    obj["name"] = d.Get("name")
+    obj["type"] = d.Get("type")
+    obj["routingMode"] = d.Get("routingMode")
+}
+return obj, nil

mmv1/third_party/terraform/services/networkservices/resource_network_services_gateway_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/hashicorp/terraform-provider-google/google/acctest"
 
 	"github.com/hashicorp/terraform-plugin-testing/helper/resource"
+	"github.com/hashicorp/terraform-plugin-testing/plancheck"
 )
 
 func TestAccNetworkServicesGateway_update(t *testing.T) {
@@ -30,6 +31,11 @@ func TestAccNetworkServicesGateway_update(t *testing.T) {
 			},
 			{
 				Config: testAccNetworkServicesGateway_update(gatewayName),
+				ConfigPlanChecks: resource.ConfigPlanChecks{
+					PreApply: []plancheck.PlanCheck{
+						plancheck.ExpectResourceAction("google_network_services_gateway.foobar", plancheck.ResourceActionUpdate),
+					},
+				},
 			},
 			{
 				ResourceName:            "google_network_services_gateway.foobar",
@@ -59,7 +65,7 @@ resource "google_network_services_gateway" "foobar" {
   name        = "%s"
   scope       = "default-scope-update"
   type        = "OPEN_MESH"
-  ports       = [443]
+  ports       = [1000]
   description = "update description"
   labels      = {
     foo = "bar"