Fix up a bunch of go duration bugs and add tests

Consul.Test/Consul.Test.csproj

@@ -98,6 +98,7 @@
     <Compile Include="SessionTest.cs" />
     <Compile Include="StatusTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UtilTest.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />

Consul.Test/UtilTest.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Consul.Test
+{
+    public class UtilTest
+    {
+        [Fact]
+        public void GoDurationTest()
+        {
+            Assert.Equal("150ms", new TimeSpan(0, 0, 0, 0, 150).ToGoDuration());
+            Assert.Equal("26h3m4.005s", new TimeSpan(1, 2, 3, 4, 5).ToGoDuration());
+            Assert.Equal("2h3m4.005s", new TimeSpan(0, 2, 3, 4, 5).ToGoDuration());
+            Assert.Equal("3m4.005s", new TimeSpan(0, 0, 3, 4, 5).ToGoDuration());
+            Assert.Equal("4.005s", new TimeSpan(0, 0, 0, 4, 5).ToGoDuration());
+            Assert.Equal("5ms", new TimeSpan(0, 0, 0, 0, 5).ToGoDuration());
+        }
+    }
+}

Consul/Utilities/Extensions.cs

@@ -49,37 +49,37 @@ internal static string ToGoDuration(this TimeSpan ts)
             {
                 return "0";
             }
-            var outDuration = new StringBuilder();
+
             if (ts.TotalSeconds < 1)
             {
-                outDuration.Append(ts.TotalMilliseconds.ToString("#ms"));
+                return ts.TotalMilliseconds.ToString("#ms");
             }
             else
             {
+                var outDuration = new StringBuilder();
                 if ((int)ts.TotalHours > 0)
                 {
                     outDuration.Append(ts.TotalHours.ToString("#h"));
                 }
-                if ((int)ts.TotalMinutes > 0)
+                if (ts.Minutes > 0)
                 {
-                    outDuration.Append(ts.Minutes.ToString("#m"));
+                    outDuration.Append(ts.ToString("%m'm'"));
                 }
-                if ((int)ts.TotalSeconds > 0)
+                if (ts.Seconds > 0)
                 {
-                    outDuration.Append(ts.Seconds.ToString("#"));
+                    outDuration.Append(ts.ToString("%s"));
                 }
-
                 if (ts.Milliseconds > 0)
                 {
                     outDuration.Append(".");
-                    outDuration.Append(ts.Milliseconds.ToString("#"));
+                    outDuration.Append(ts.ToString("fff"));
                 }
                 if (ts.Seconds > 0)
                 {
                     outDuration.Append("s");
                 }
+                return outDuration.ToString();
             }
-            return outDuration.ToString();
         }
         internal static TimeSpan FromGoDuration(string value)
         {