azurerm_mongo_cluster - move the validation to create func for `sou…

…rce_server_id` (hashicorp#28269)

* azurerm_mongo_cluster - move the validation to create func for source_server_id

* update tc

internal/services/mongocluster/mongo_cluster_resource.go

@@ -238,6 +238,10 @@ func (r MongoClusterResource) Create() sdk.ResourceFunc {
 			}
 
 			if state.CreateMode == string(mongoclusters.CreateModeGeoReplica) {
+				if state.SourceServerId == "" {
+					return fmt.Errorf("`source_server_id` is required when `create_mode` is `GeoReplica`")
+				}
+
 				parameter.Properties.ReplicaParameters = &mongoclusters.MongoClusterReplicaParameters{
 					SourceLocation:   state.SourceLocation,
 					SourceResourceId: state.SourceServerId,
@@ -508,9 +512,6 @@ func (r MongoClusterResource) CustomizeDiff() sdk.ResourceFunc {
 					return fmt.Errorf("`version` is required when `create_mode` is %s", string(mongoclusters.CreateModeDefault))
 				}
 			case string(mongoclusters.CreateModeGeoReplica):
-				if state.SourceServerId == "" {
-					return fmt.Errorf("`source_server_id` is required when `create_mode` is `GeoReplica`")
-				}
 				if state.SourceLocation == "" {
 					return fmt.Errorf("`source_location` is required when `create_mode` is `GeoReplica`")
 				}

internal/services/mongocluster/mongo_cluster_resource_test.go

@@ -101,6 +101,21 @@ func TestAccMongoCluster_previewFeature(t *testing.T) {
 	})
 }
 
+func TestAccMongoCluster_geoReplica(t *testing.T) {
+	data := acceptance.BuildTestData(t, "azurerm_mongo_cluster", "test")
+	r := MongoClusterResource{}
+
+	data.ResourceTest(t, r, []acceptance.TestStep{
+		{
+			Config: r.geoReplica(data),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+			),
+		},
+		data.ImportStep("administrator_password", "create_mode", "source_location"),
+	})
+}
+
 func (r MongoClusterResource) Exists(ctx context.Context, clients *clients.Client, state *pluginsdk.InstanceState) (*bool, error) {
 	id, err := mongoclusters.ParseMongoClusterID(state.ID)
 	if err != nil {