Merge pull request #459 from zendesk/dasch/fix-tests

Try to make the tests more reliable

Author: dasch

Diff for: spec/test_cluster.rb

@@ -111,7 +111,7 @@ def start_kafka_containers
   end
 
   def kafka_hosts
-    @kafka_brokers.map {|kafka|
+    @kafka_hosts ||= @kafka_brokers.map {|kafka|
       config = kafka.json.fetch("NetworkSettings").fetch("Ports")
       port = config.fetch("9092/tcp").first.fetch("HostPort")
       host = DOCKER_HOSTNAME