test: move a case to a cohesive location (#282)

Author: supercaracal

test/redis_client/test_cluster.rb

@@ -181,12 +181,6 @@ def test_pipelined_with_many_commands
         results.each_with_index { |got, i| assert_equal(i.to_s, got) }
       end
 
-      def test_pubsub_without_subscription
-        pubsub = @client.pubsub
-        assert_nil(pubsub.next_event(0.01))
-        pubsub.close
-      end
-
       def test_transaction_with_single_key
         got = @client.multi do |t|
           t.call('SET', 'counter', '0')
@@ -257,6 +251,12 @@ def test_transaction_without_hashtag
         end
       end
 
+      def test_pubsub_without_subscription
+        pubsub = @client.pubsub
+        assert_nil(pubsub.next_event(0.01))
+        pubsub.close
+      end
+
       def test_pubsub_with_wrong_command
         pubsub = @client.pubsub
         assert_nil(pubsub.call('SUBWAY'))