* installing *source* package ‘TWW’ ...
** using staged installation
** R
** byte-compile and prepare package for lazy loading
Error in library(testthat) : there is no package called ‘testthat’
Error: unable to load R code in package ‘TWW’
Execution halted
ERROR: lazy loading failed for package ‘TWW’
* removing ‘/srv/hornik/tmp/CRAN/TWW.Rcheck/TWW’