Fixes crash in blocktimefinder

Framework/NethereumWorkflow/BlockUtils/BlockTimeFinder.cs

@@ -70,7 +70,7 @@ namespace NethereumWorkflow.BlockUtils
         {
             var next = GetBlock(entry.BlockNumber + 1);
             return
-                entry.Utc < target &&
+                entry.Utc <= target &&
                 next.Utc > target;
         }
 
@@ -78,7 +78,7 @@ namespace NethereumWorkflow.BlockUtils
         {
             var previous = GetBlock(entry.BlockNumber - 1);
             return
-                entry.Utc > target &&
+                entry.Utc >= target &&
                 previous.Utc < target;
         }
 

Tests/FrameworkTests/NethereumWorkflow/BlockTimeFinderTests.cs

@@ -166,5 +166,10 @@ namespace FrameworkTests.NethereumWorkflow
         public DateTime Time { get; }
         public DateTime JustBefore { get { return Time.AddSeconds(-1); } }
         public DateTime JustAfter { get { return Time.AddSeconds(1); } }
+
+        public override string ToString()
+        {
+            return $"[{Number}]";
+        }
     }
 }