Add negated client checks

Author: graemerocher

http-server-netty/src/test/groovy/io/micronaut/http/server/netty/websocket/PojoWebSocketSpec.groovy

@@ -35,21 +35,19 @@ class PojoWebSocketSpec extends Specification {
         then:
         conditions.eventually {
             bob.replies.contains(new Message(text:"[fred] Hello bob!"))
-            bob.replies.size() == 2
             fred.replies.contains(new Message(text:"[bob] Joined!"))
-            fred.replies.size() == 1
+            !fred.replies.contains(new Message(text:"[fred] Hello bob!"))
+            !bob.replies.contains(new Message(text:"[bob] Joined!"))
         }
 
         when:
         bob.send(new Message(text: "Hi fred. How are things?"))
 
         then:
         conditions.eventually {
-
             fred.replies.contains(new Message(text:"[bob] Hi fred. How are things?"))
-            fred.replies.size() == 2
+            !bob.replies.contains(new Message(text:"[bob] Hi fred. How are things?"))
             bob.replies.contains(new Message(text:"[fred] Hello bob!"))
-            bob.replies.size() == 2
         }
         fred.sendAsync(new Message(text:  "foo")).get().text == 'foo'
         fred.sendRx(new Message(text:  "bar")).blockingGet().text == 'bar'