Add failing spec simulating race condition.

spec/redis/connection/celluloid_spec.rb

@@ -21,4 +21,40 @@
       expect { redis.shutdown }.not_to raise_error
     end
   end
+
+  describe "using inside Celluloid::IO" do
+    before do
+      class Incrementor
+        include Celluloid::IO
+
+        def initialize
+          @redis = Redis.new(:driver => :celluloid)
+        end
+
+        def increment!
+          sleep(rand / 10)
+          @redis.incr 'rabbits'
+        rescue
+          STDERR.puts "I cannot increment rabbits because of #{$!.inspect}!"
+          raise RuntimeError
+        end
+      end
+    end
+
+    let(:actor) {
+      Incrementor.new
+    }
+    let(:count) { 1000 }
+
+    it "just survives" do
+      redis = Redis.new
+      redis.set 'rabbits', 0
+
+      count.times do
+        actor.async.increment! rescue nil
+      end
+      sleep 10
+      expect(redis.get 'rabbits').to eq(count.to_s)
+    end
+  end
 end