Running 'testthat.R' [7s/8s]
Running the tests in 'tests/testthat.R' failed.
Complete output:
  > library(testthat)
  > library(EpiEstim)
  > 
  > test_check("EpiEstim")
  -- 1. Error: plot.estimate_R doesn't have to include the legend (@test-plot.R#24
  there is no package called 'vdiffr'
  Backtrace:
   1. vdiffr::expect_doppelganger
   2. base::getExportedValue(pkg, name)
   3. base::asNamespace(ns)
   4. base::getNamespace(ns)
   5. base::loadNamespace(name)
   6. base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
   7. base:::withOneRestart(expr, restarts[[1L]])
   8. base:::doWithOneRestart(return(expr), restart)
  
  -- 2. Error: incidence can be plotted separately with imported cases (@test-plot
  there is no package called 'vdiffr'
  Backtrace:
   1. vdiffr::expect_doppelganger
   2. base::getExportedValue(pkg, name)
   3. base::asNamespace(ns)
   4. base::getNamespace(ns)
   5. base::loadNamespace(name)
   6. base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
   7. base:::withOneRestart(expr, restarts[[1L]])
   8. base:::doWithOneRestart(return(expr), restart)
  
  -- 3. Error: serial interval distribution can be plotted separately (@test-plot.
  there is no package called 'vdiffr'
  Backtrace:
   1. vdiffr::expect_doppelganger
   2. base::getExportedValue(pkg, name)
   3. base::asNamespace(ns)
   4. base::getNamespace(ns)
   5. base::loadNamespace(name)
   6. base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
   7. base:::withOneRestart(expr, restarts[[1L]])
   8. base:::doWithOneRestart(return(expr), restart)
  
  -- 4. Error: Reproduction numbers can be plotted separately (@test-plot.R#45)  -
  there is no package called 'vdiffr'
  Backtrace:
   1. vdiffr::expect_doppelganger
   2. base::getExportedValue(pkg, name)
   3. base::asNamespace(ns)
   4. base::getNamespace(ns)
   5. base::loadNamespace(name)
   6. base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
   7. base:::withOneRestart(expr, restarts[[1L]])
   8. base:::doWithOneRestart(return(expr), restart)
  
  == testthat results  ===========================================================
  [ OK: 8 | SKIPPED: 0 | WARNINGS: 0 | FAILED: 4 ]
  1. Error: plot.estimate_R doesn't have to include the legend (@test-plot.R#24) 
  2. Error: incidence can be plotted separately with imported cases (@test-plot.R#31) 
  3. Error: serial interval distribution can be plotted separately (@test-plot.R#38) 
  4. Error: Reproduction numbers can be plotted separately (@test-plot.R#45) 
  
  Error: testthat unit tests failed
  Execution halted