Fix RUBY-1687 Cluster hangs waiting for first round of sdam when time is frozen (#1225)

Author: p-mongo

lib/mongo/cluster.rb

@@ -177,7 +177,7 @@ def initialize(seeds, monitoring, options = Options::Redacted.new)
         # server selection timeout or the 3 second minimum.
         loop do
           servers = servers_list.dup
-          if servers.all? { |server| server.description.last_update_time > start_time }
+          if servers.all? { |server| server.description.last_update_time >= start_time }
             break
           end
           if (time_remaining = deadline - Time.now) <= 0

spec/integration/client_construction_spec.rb

@@ -91,4 +91,17 @@
       expect(client.options[:connect]).to eq :direct
     end
   end
+
+  context 'when time is frozen' do
+    let(:now) { Time.now }
+    before do
+      allow(Time).to receive(:now).and_return(now)
+    end
+
+    it 'connects' do
+      client = ClientRegistry.instance.new_local_client([SpecConfig.instance.addresses.first],
+        SpecConfig.instance.test_options)
+      expect(client.cluster.topology).not_to be_a(Mongo::Cluster::Topology::Unknown)
+    end
+  end
 end