fixed cluster monitoring tests to use configured URI.

Author: craiggwilson

src/MongoDB.Driver.Core.TestHelpers/CoreTestConfiguration.cs

@@ -74,14 +74,19 @@ public static SemanticVersion ServerVersion
 
         // static methods
         public static ClusterBuilder ConfigureCluster()
+        {
+            return ConfigureCluster(new ClusterBuilder());
+        }
+
+        public static ClusterBuilder ConfigureCluster(ClusterBuilder builder)
         {
             var serverSelectionTimeoutString = Environment.GetEnvironmentVariable("MONGO_SERVER_SELECTION_TIMEOUT_MS");
             if (serverSelectionTimeoutString == null)
             {
                 serverSelectionTimeoutString = "10000";
             }
 
-            var builder = new ClusterBuilder()
+            builder = builder
                 .ConfigureWithConnectionString(__connectionString)
                 .ConfigureCluster(c => c.With(serverSelectionTimeout: TimeSpan.FromMilliseconds(int.Parse(serverSelectionTimeoutString))));
 

src/MongoDB.Driver.Tests/Specifications/command-monitoring/TestRunner.cs

@@ -65,6 +65,7 @@ public void TestFixtureSetUp()
             {
                 ClusterConfigurator = cb =>
                 {
+                    cb = CoreTestConfiguration.ConfigureCluster(cb);
                     cb.Subscribe(__capturedEvents);
 
                     // never heartbeat...