Fix min lovelace when the input is Value type

Author: cffls

pycardano/utils.py

@@ -103,7 +103,7 @@ def min_lovelace(
     Returns:
         int: Minimum required lovelace amount for this transaction output.
     """
-    if isinstance(amount, int):
+    if isinstance(amount, int) or not amount.multi_asset:
         return context.protocol_param.min_utxo
 
     b_size = bundle_size(amount.multi_asset)

test/pycardano/test_util.py

@@ -10,6 +10,10 @@ def test_min_lovelace_ada_only(chain_context):
     assert min_lovelace(2000000, chain_context) == chain_context.protocol_param.min_utxo
 
 
+def test_min_lovelace_ada_only_2(chain_context):
+    assert min_lovelace(Value(2000000), chain_context) == chain_context.protocol_param.min_utxo
+
+
 class TestMinLoveLaceMultiAsset:
 
     # Tests copied from: https://github.com/input-output-hk/cardano-ledger/blob/master/doc/explanations/min-utxo-alonzo.rst#example-min-ada-value-calculations-and-current-constants