[R] To overlay my raster and its boundary

[Komine]

Hi
I want to overlay my raster and its boundary which is a shapefile.
 When I used thise code separately, all is ok:
# Open raster 
>Image<-read.table("C:\\Users\\Documents\\Nouveau\\Frequence.txt",sep="",dec=",",header=TRUE)    
 >testo<-rasterFromXYZ(Image)   
>plot(testo) 
>testo2 <- aggregate(testo,fact=10, fun=mean) 
>plot(testo2) 
# open shapefiles= boundary 
>library (rgdal) 
>test1<-readOGR(dsn="C:\\Users\\Documents\\DISC D\\Nouveau",layer="pays") 
>plot(test1) 

But How to overlay both layers (raster and shapefile) to have a same map?.
Thank you in advance 

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