Test transaction with a fee

sdk/src/transaction_builder.rs

@@ -227,6 +227,12 @@ mod tests {
         assert_eq!(tx.instructions[0], Instruction::new(0, &0, vec![0]));
     }
 
+    #[test]
+    fn test_transaction_builder_fee() {
+        let tx = TransactionBuilder::new(42).sign(&Vec::<&Keypair>::new(), Hash::default());
+        assert_eq!(tx.fee, 42);
+    }
+
     #[test]
     fn test_transaction_builder_kitchen_sink() {
         let program_id0 = Pubkey::default();