Added a unit test to verify that reference ids are used.

Author: niemyjski

Source/Tests/Plugins/PluginTests.cs

@@ -78,6 +78,22 @@ public void CanCancel() {
             Assert.Equal(0, context.Event.Tags.Count);
         }
 
+        [Fact]
+        public void ShouldUseReferenceIds() {
+            var client = new ExceptionlessClient();
+            foreach (var plugin in client.Configuration.Plugins)
+                client.Configuration.RemovePlugin(plugin.Key);
+
+            var context = new EventPluginContext(client, new Event { Type = Event.KnownTypes.Error });
+            EventPluginManager.Run(context);
+            Assert.Null(context.Event.ReferenceId);
+
+            client.Configuration.UseReferenceIds();
+            context = new EventPluginContext(client, new Event { Type = Event.KnownTypes.Error });
+            EventPluginManager.Run(context);
+            Assert.NotNull(context.Event.ReferenceId);
+        }
+
         [Fact]
         public void VerifyPriority() {
             var config = new ExceptionlessConfiguration(DependencyResolver.CreateDefault());