Small fix

Author: papafe

src/MongoDB.Driver/IClientSession.cs

@@ -21,6 +21,15 @@
 
 namespace MongoDB.Driver
 {
+    public static class ClientSessionExtensions
+    {
+        //TODO This will need to be moved somewhere else
+        public static BsonTimestamp GetSnapshotTime(this IClientSessionHandle session)
+        {
+            return ((ClientSessionHandle)session).SnapshotTime;
+        }
+    }
+
     /// <summary>
     /// The interface for a client session.
     /// </summary>
@@ -83,11 +92,6 @@ public interface IClientSession : IDisposable
         /// </value>
         IServerSession ServerSession { get; }
 
-        /// <summary>
-        /// //TODO
-        /// </summary>
-        BsonTimestamp SnapshotTime { get; }
-
         /// <summary>
         /// Gets the wrapped core session (intended for internal use only).
         /// </summary>

tests/MongoDB.Driver.Tests/AtClusterTimeTests.cs

@@ -51,7 +51,7 @@ public void AtClusterTime_should_work()
             var results = collection.Find(session1, filterDefinition).Sort(sortDefinition).ToList();
             AssertOneObj(results);
 
-            clusterTime1 = session1.SnapshotTime;
+            clusterTime1 = session1.GetSnapshotTime();
             Assert.NotEqual(null, clusterTime1);
         }
 
@@ -70,7 +70,7 @@ public void AtClusterTime_should_work()
             var results = collection.Find(session2, filterDefinition).Sort(sortDefinition).ToList();
             AssertOneObj(results);
 
-            var clusterTime2 = session2.SnapshotTime;
+            var clusterTime2 = session2.GetSnapshotTime();
             Assert.Equal(clusterTime2, clusterTime1);
         }