@Override
    public void appendTo(StringBuffer stringBuffer) {
      stringBuffer.append("StackLevelConfigurationRequestSetMatcher(").append(stackLevelConfigurationRequest).append(")");
    }
Matcher for a StackConfigurationDependency set containing a single request.
ambari-server/src/test/java/org/apache/ambari/server/controller/internal/AbstractResourceProviderTest.java