Completed the GetNetwork method

Breeze/src/Breeze.Api.Tests/WalletHelpersTest.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+using Breeze.Wallet.Helpers;
+using NBitcoin;
+using Xunit;
+
+namespace Breeze.Api.Tests
+{
+    public class WalletHelpersTest
+    {
+        [Fact]
+        public void GetMainNetworkRetuirnsNetworkMain()
+        {
+            Network network = WalletHelpers.GetNetwork("main");
+            Assert.Equal(Network.Main, network);            
+        }
+
+        [Fact]
+        public void GetMainNetNetworkRetuirnsNetworkMain()
+        {
+            Network network = WalletHelpers.GetNetwork("mainnet");
+            Assert.Equal(Network.Main, network);
+        }
+
+        [Fact]
+        public void GetTestNetworkRetuirnsNetworkTest()
+        {
+            Network network = WalletHelpers.GetNetwork("test");
+            Assert.Equal(Network.TestNet, network);
+        }
+
+        [Fact]
+        public void GetTestNetNetworkRetuirnsNetworkTest()
+        {
+            Network network = WalletHelpers.GetNetwork("testnet");
+            Assert.Equal(Network.TestNet, network);
+        }
+
+        [Fact]
+        public void GetNetworkIsCaseInsensitive()
+        {
+            Network testNetwork = WalletHelpers.GetNetwork("Test");
+            Assert.Equal(Network.TestNet, testNetwork);
+
+            Network mainNetwork = WalletHelpers.GetNetwork("MainNet");
+            Assert.Equal(Network.Main, mainNetwork);
+        }
+
+        [Fact]
+        public void WrongNetworkThrowsArgumentException()
+        {
+            var exception = Record.Exception(() => WalletHelpers.GetNetwork("myNetwork"));
+            Assert.NotNull(exception);
+            Assert.IsType<ArgumentException>(exception);
+        }
+    }
+}

Breeze/src/Breeze.Wallet/Helpers/WalletHelpers.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+using NBitcoin;
+using Stratis.Bitcoin.Utilities;
+
+namespace Breeze.Wallet.Helpers
+{
+    /// <summary>
+    /// Contains a collection of helpers methods.
+    /// </summary>
+    public static class WalletHelpers
+    {
+        /// <summary>
+        /// Get the network on which to operate.
+        /// </summary>
+        /// <param name="network">The network</param>
+        /// <returns>A <see cref="Network"/> object.</returns>
+        public static Network GetNetwork(string network)
+        {
+            Guard.NotEmpty(network, nameof(network));
+
+            switch (network.ToLowerInvariant())
+            {
+                case "main":
+                case "mainnet":
+                    return Network.Main;
+                case "test":
+                case "testnet":
+                    return Network.TestNet;
+                default:
+                    throw new ArgumentException($"Network '{network}' is not a valid network.");
+            }
+        }
+
+    }
+}

Breeze/src/Breeze.Wallet/Wrappers/WalletWrapper.cs

-using System.IO;
+using System;
+using System.IO;
 using System.Linq;
+using Breeze.Wallet.Helpers;
 using Breeze.Wallet.Models;
 using HBitcoin.KeyManagement;
 using NBitcoin;
@@ -22,7 +24,7 @@ namespace Breeze.Wallet.Wrappers
 		public string Create(string password, string folderPath, string name, string network)
 		{			
 			Mnemonic mnemonic;
-			Safe wallet = Safe.Create(out mnemonic, password, Path.Combine(folderPath, $"{name}.json"), this.GetNetwork(network));
+			Safe wallet = Safe.Create(out mnemonic, password, Path.Combine(folderPath, $"{name}.json"), WalletHelpers.GetNetwork(network));
 			return mnemonic.ToString();
 		}
 
@@ -57,7 +59,7 @@ namespace Breeze.Wallet.Wrappers
 		/// <returns></returns>
 		public WalletModel Recover(string password, string folderPath, string name, string network, string mnemonic)
 		{
-			Safe wallet = Safe.Recover(new Mnemonic(mnemonic), password, Path.Combine(folderPath, $"{name}.json"), this.GetNetwork(network));
+			Safe wallet = Safe.Recover(new Mnemonic(mnemonic), password, Path.Combine(folderPath, $"{name}.json"), WalletHelpers.GetNetwork(network));
 
 			//TODO review here which data should be returned
 			return new WalletModel
@@ -68,19 +70,6 @@ namespace Breeze.Wallet.Wrappers
 			};
 		}
         
-		private Network GetNetwork(string network)
-		{
-			// any network different than MainNet will default to TestNet			
-			switch (network.ToLowerInvariant())
-			{
-				case "main":
-				case "mainnet":
-					return Network.Main;					
-				default:
-					return Network.TestNet;
-			}
-		}
-
 		public WalletInfoModel GetInfo(string name)
 		{
 			throw new System.NotImplementedException();