Fix print formatting errors

docker/factory.go

@@ -63,7 +63,7 @@ func NewClient(instance *types.Instance, proxyHost string) (*client.Client, erro
 
 	dc, err := client.NewClient(durl, api.DefaultVersion, cli, nil)
 	if err != nil {
-		return nil, fmt.Errorf("Could not connect to DinD docker daemon", err)
+		return nil, fmt.Errorf("Could not connect to DinD docker daemon: %v", err)
 	}
 
 	return dc, nil

handlers/new_session.go

@@ -68,7 +68,7 @@ func NewSession(rw http.ResponseWriter, req *http.Request) {
 			return
 		}
 		if d > playground.DefaultSessionDuration {
-			log.Printf("Specified session duration was %s but maximum allowed by this playground is %d\n", d.String(), playground.DefaultSessionDuration.String())
+			log.Printf("Specified session duration was %s but maximum allowed by this playground is %s\n", d.String(), playground.DefaultSessionDuration.String())
 			rw.WriteHeader(http.StatusBadRequest)
 			return
 		}

pwd/instance_test.go

@@ -207,7 +207,6 @@ func TestInstanceNew_WithCustomHostname(t *testing.T) {
 	_s.On("SessionCount").Return(1, nil)
 	_s.On("ClientCount").Return(0, nil)
 	_s.On("InstanceCount").Return(0, nil)
-	_s.On("InstanceFindBySessionId", "aaaabbbbcccc").Return([]*types.Instance{}, nil)
 
 	var nilArgs []interface{}
 	_e.M.On("Emit", event.SESSION_NEW, "aaaabbbbcccc", nilArgs).Return()

scheduler/scheduler.go

@@ -275,7 +275,7 @@ func (s *scheduler) Start() error {
 		if _, found := s.playgrounds[session.PlaygroundId]; !found {
 			playground, err := s.storage.PlaygroundGet(session.PlaygroundId)
 			if err != nil {
-				log.Printf("Could not find playground %s\n")
+				log.Printf("Could not find playground %s\n", session.PlaygroundId)
 				return
 			}
 			s.playgrounds[playground.Id] = playground