MONGOID-5177 Fix flaky contextual spec (#5064)

Author: comandeo-mongo

spec/mongoid/contextual/mongo_spec.rb

@@ -640,8 +640,21 @@
           end
 
           it "does not load all documents" do
-            expect(Mongo::Logger.logger).to receive(:debug?).exactly(2).times.and_call_original
+            subscriber = Mrss::EventSubscriber.new
+            context.view.client.subscribe(Mongo::Monitoring::COMMAND, subscriber)
+
             enum.next
+
+            find_events = subscriber.all_events.select do |evt|
+              evt.command_name == 'find'
+            end
+            expect(find_events.length).to be(2)
+            get_more_events = subscriber.all_events.select do |evt|
+              evt.command_name == 'getMore'
+            end
+            expect(get_more_events.length).to be(0)
+          ensure
+            context.view.client.unsubscribe(Mongo::Monitoring::COMMAND, subscriber)
           end
         end
       end

spec/shared

@@ -31,6 +31,7 @@ def database_id_alt
 require 'mrss/cluster_config'
 require 'support/client_registry'
 require 'mrss/constraints'
+require 'mrss/event_subscriber'
 
 ClusterConfig = Mrss::ClusterConfig