Add exodus transaction getter and setter

src/Ztm.Zcoin.NBitcoin.Tests/TransactionExtensionsTests.cs

@@ -0,0 +1,46 @@
+using NBitcoin;
+using Xunit;
+using Ztm.Zcoin.NBitcoin.Exodus;
+
+namespace Ztm.Zcoin.NBitcoin.Tests
+{
+    public sealed class TransactionExtensionsTests
+    {
+        readonly Transaction subject;
+
+        public TransactionExtensionsTests()
+        {
+            this.subject = Transaction.Parse(ZcoinTransactionData.ZerocoinRemint, ZcoinNetworks.Instance.Regtest);
+        }
+
+        [Fact]
+        public void SetExodusTransaction_WithNull_ShouldNotThrow()
+        {
+            this.subject.SetExodusTransaction(null);
+        }
+
+        [Fact]
+        public void GetExodusTransaction_WithUnsetValue_ShouldRetreiveNull()
+        {
+            Assert.Null(this.subject.GetExodusTransaction());
+        }
+
+        [Fact]
+        public void SetAndGetExodusTransaction_WithValidTransaction_ShouldRetreiveSameTx()
+        {
+            // Arrange.
+            var address = BitcoinAddress.Create("TG3Pnw5xPZQS8JXMVa3F9WjUFfUqXKsqAz", ZcoinNetworks.Instance.Regtest);
+            var propertyId = new PropertyId(3);
+            var amount = new PropertyAmount(10);
+
+            var exodusTx = new SimpleSendV0(address, address, propertyId, amount);
+
+            // Act.
+            this.subject.SetExodusTransaction(exodusTx);
+            var retrieved = this.subject.GetExodusTransaction();
+
+            // Assert.
+            Assert.Same(exodusTx, retrieved);
+        }
+    }
+}

src/Ztm.Zcoin.NBitcoin/TransactionExtensions.cs

@@ -1,4 +1,6 @@
+using System;
 using NBitcoin;
+using Ztm.Zcoin.NBitcoin.Exodus;
 
 namespace Ztm.Zcoin.NBitcoin
 {
@@ -18,5 +20,16 @@ public static bool IsZerocoinRemint(this Transaction transaction)
         {
             return ((ZcoinTransaction)transaction).IsZerocoinRemint;
         }
+
+        [ObsoleteAttribute("This method should be called in specific places", false)]
+        public static void SetExodusTransaction(this Transaction transaction, ExodusTransaction exodusTransaction)
+        {
+            ((ZcoinTransaction)transaction).ExodusTransaction = exodusTransaction;
+        }
+
+        public static ExodusTransaction GetExodusTransaction(this Transaction transaction)
+        {
+            return ((ZcoinTransaction)transaction).ExodusTransaction;
+        }
     }
 }

src/Ztm.Zcoin.NBitcoin/ZcoinTransaction.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using NBitcoin;
+using Ztm.Zcoin.NBitcoin.Exodus;
 
 namespace Ztm.Zcoin.NBitcoin
 {
@@ -61,5 +62,7 @@ public override ConsensusFactory GetConsensusFactory()
         {
             return this.consensusFactory;
         }
+
+        public ExodusTransaction ExodusTransaction { get; set; }
     }
 }