Fix test failure in expandybird.

expandybird/service/service.go

@@ -17,8 +17,8 @@ limitations under the License.
 package service
 
 import (
-	"github.com/kubernetes/deployment-manager/expandybird/expander"
 	"github.com/kubernetes/deployment-manager/common"
+	"github.com/kubernetes/deployment-manager/expandybird/expander"
 	"github.com/kubernetes/deployment-manager/util"
 
 	"errors"
@@ -44,7 +44,8 @@ func NewService(handler restful.RouteFunction) *Service {
 	webService.Produces(restful.MIME_JSON, restful.MIME_XML)
 	webService.Route(webService.POST("/expand").To(handler).
 		Doc("Expand a template.").
-		Reads(&common.Template{}))
+		Reads(&common.Template{}).
+		Writes(&expander.ExpansionResponse{}))
 	return &Service{webService}
 }