@Override
        public boolean equals(Object o) {
            if (o == this) return true;
            if ( !  (o instanceof DeclaredZone)) return false;
            DeclaredZone other = (DeclaredZone)o;
            if (this.environment != other.environment) return false;
            if ( ! this.region.equals(other.region())) return false;
            return true;
        }
The XML &lt;nodes&gt; tag of the tester application for this zone, if specified.
config-model-api/src/main/java/com/yahoo/config/application/api/DeploymentSpec.java