test: add protocol validation tests for octojoin

Author: 1440000bytes

cw_bitcoin/test/octojoin_builder_test.dart

@@ -0,0 +1,79 @@
+import 'package:cw_bitcoin/bitcoin_address_record.dart';
+import 'package:cw_bitcoin/bitcoin_unspent.dart';
+import 'package:cw_bitcoin/octojoin_transaction_builder.dart';
+import 'package:cw_core/unspent_coins_info.dart';
+import 'package:cw_core/utils/print_verbose.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bitcoin_base/bitcoin_base.dart';
+
+void main() {
+  group('OctojoinTransactionBuilder E2E Logic Test', () {
+    test('decomposeAmount successfully chunks into standard denominations', () {
+      final amount = 300000;
+      final denominations = OctojoinTransactionBuilder.decomposeAmount(amount);
+      
+      printV('Decomposed Amount: $amount sats');
+      printV('Denominations Result: $denominations');
+      
+      expect(denominations.length, 2);
+      expect(denominations.contains(200000), true);
+      expect(denominations.contains(100000), true);
+    });
+
+    test('selectUTXOs correctly isolates octojoin notes from unspents', () {
+      final walletId = 'test_wallet';
+      
+      final addrRecord1 = BitcoinAddressRecord('addr1', index: 0, type: SegwitAddresType.p2wpkh, network: BitcoinNetwork.testnet);
+      final addrRecord2 = BitcoinAddressRecord('addr2', index: 1, type: SegwitAddresType.p2wpkh, network: BitcoinNetwork.testnet);
+      final addrRecord3 = BitcoinAddressRecord('addr3', index: 2, type: SegwitAddresType.p2wpkh, network: BitcoinNetwork.testnet);
+
+      final unspentCoins = [
+         BitcoinUnspent(addrRecord1, 'hash1', 150000, 0),
+         BitcoinUnspent(addrRecord2, 'hash2', 150000, 0),
+         BitcoinUnspent(addrRecord3, 'hash3', 50000, 0),
+      ];
+      
+      final unspentCoinsInfoValues = [
+         UnspentCoinsInfo(walletId: walletId, hash: 'hash1', address: 'addr1', value: 150000, vout: 0, isFrozen: false, isSending: true, noteRaw: 'Octojoin 1'),
+         UnspentCoinsInfo(walletId: walletId, hash: 'hash2', address: 'addr2', value: 150000, vout: 0, isFrozen: false, isSending: true, noteRaw: 'octojoin 2'),
+         UnspentCoinsInfo(walletId: walletId, hash: 'hash3', address: 'addr3', value: 50000, vout: 0, isFrozen: false, isSending: true, noteRaw: 'Normal TX'),
+      ];
+      
+      final selection = OctojoinTransactionBuilder.selectUTXOs(
+        unspentCoins, 
+        unspentCoinsInfoValues, 
+        3, 
+        walletId,
+        300000
+      );
+      
+      final swapped = selection['swapped'] as List<BitcoinUnspent>;
+      final other = selection['other'] as List<BitcoinUnspent>;
+      final all = selection['all'] as List<BitcoinUnspent>;
+      
+      printV('--- UTXO Selection Pipeline ---');
+      printV('Swapped UTXOs Found: ${swapped.length}');
+      printV('Total Value Selected: ${selection['totalValue']}');
+
+      expect(swapped.length, 2);
+      expect(other.length, 1);
+      expect(all.length, 3);
+      expect(selection['totalValue'], 350000);
+    });
+    
+    test('distributeOutputs seamlessly maps exact denominations to destination addresses', () {
+       final addrs = ['addr1', 'addr2'];
+       final denominations = [200000, 100000, 1000];
+       
+       final outputsMap = OctojoinTransactionBuilder.distributeOutputs(denominations, addrs);
+       
+       printV('--- Final Output Structure Map ---');
+       outputsMap.forEach((key, value) {
+         printV('Address: $key -> Value: $value sats');
+       });
+       
+       expect(outputsMap['addr1'], 201000);
+       expect(outputsMap['addr2'], 100000);
+    });
+  });
+}