Sketch a test configuration.

server/services/constructionService.go

@@ -177,6 +177,7 @@ func (service *constructionService) computeData(options *constructionOptions) []
 }
 
 func (service *constructionService) computeDataForCustomCurrencyTransfer(tokenIdentifier string, amount string) []byte {
+	// Only fungible tokens are supported (at least, for now).
 	data := fmt.Sprintf("%s@%s@%s", builtInFunctionESDTTransfer, stringToHex(tokenIdentifier), amountToHex(amount))
 	return []byte(data)
 }
@@ -248,6 +249,7 @@ func (service *constructionService) ConstructionParse(
 
 func (service *constructionService) createOperationsFromPreparedTx(tx *data.Transaction) ([]*types.Operation, error) {
 	var operations []*types.Operation
+
 	isCustomCurrencyTransfer := isCustomCurrencyTransfer(string(tx.Data))
 
 	if isCustomCurrencyTransfer {
@@ -269,6 +271,7 @@ func (service *constructionService) createOperationsFromPreparedTx(tx *data.Tran
 			},
 		}
 	} else {
+		// Native currency transfer
 		operations = []*types.Operation{
 			{
 				Type:    opTransfer,

systemtests/devnet-construction.json

@@ -0,0 +1,35 @@
+{
+  "network": {
+    "blockchain": "MultiversX",
+    "network": "devnet"
+  },
+  "data_directory": "",
+  "http_timeout": 200,
+  "max_retries": 3,
+  "max_online_connections": 120,
+  "max_sync_concurrency": 1,
+  "construction": {
+    "end_conditions": {
+      "transfer": 2
+    },
+    "stale_depth": 10,
+    "broadcast_limit": 5,
+    "constructor_dsl_file": "devnet-construction.ros",
+    "prefunded_accounts": [
+      {
+        "account_identifier": {
+          "address": "erd1ldjsdetjvegjdnda0qw2h62kq6rpvrklkc5pw9zxm0nwulfhtyqqtyc4vq"
+        },
+        "privkey": "3e4e89e501eb542c12403fb15c52479e8721f2f4dedc3b3ef0f3b47b37de006c",
+        "curve_type": "edwards25519",
+        "currency": {
+          "symbol": "EGLD",
+          "decimals": 18
+        }
+      }
+    ]
+  },
+  "data": {
+    "inactive_discrepancy_search_disabled": true
+  }
+}

systemtests/devnet-construction.ros

@@ -0,0 +1,37 @@
+transfer(1){
+  transfer{
+    transfer.network = {"network":"devnet", "blockchain":"MultiversX"};
+    native_currency = {"symbol":"EGLD", "decimals":18};
+    sender = {
+      "account_identifier": {
+        "address": "erd1ldjsdetjvegjdnda0qw2h62kq6rpvrklkc5pw9zxm0nwulfhtyqqtyc4vq"
+      },
+      "currency": {
+          "symbol": "EGLD",
+          "decimals": 18
+      }
+    };
+
+    max_transfer_amount = "10000000000000000";
+    recipient_amount = random_number({"minimum": "1", "maximum": {{max_transfer_amount}}});
+
+    print_message({"recipient_amount":{{recipient_amount}}});
+
+    sender_amount = 0-{{recipient_amount}};
+    transfer.confirmation_depth = "10";
+    transfer.operations = [
+      {
+        "operation_identifier":{"index":0},
+        "type":"Transfer",
+        "account":{{sender.account_identifier}},
+        "amount":{
+          "value":{{sender_amount}},
+          "currency":{{native_currency}}
+        }
+      }
+    ];
+    transfer.preprocess_metadata = {
+      "receiver": "erd1qyu5wthldzr8wx5c9ucg8kjagg0jfs53s8nr3zpz3hypefsdd8ssycr6th" 
+    };
+  }
+}