Running ‘testthat-class.R’ [2s/2s]
  Running ‘testthat-exe1.R’ [1s/1s]
  Running ‘testthat-exe2.R’ [1s/1s]
  Running ‘testthat-exe3.R’ [1s/1s]
  Running ‘testthat-nldoc.R’ [2s/33s]
  Running ‘testthat-simul.R’ [5s/6s]
  Running ‘testthat-util.R’ [1s/2s]
Running the tests in ‘tests/testthat-nldoc.R’ failed.
Complete output:
  > Sys.unsetenv("R_TESTS")
  > 
  > library(testthat)
  > library(nlrx)
  > 
  > test_check("nlrx", filter = "nldoc")
  /usr/bin/pandoc +RTS -K512m -RTS nldoc.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --output nldoc.html --lua-filter /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/rmarkdown/rmarkdown/lua/pagebreak.lua --lua-filter /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/rmarkdown/rmarkdown/lua/latex-div.lua --self-contained --variable bs3=TRUE --standalone --section-divs --table-of-contents --toc-depth 3 --template /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/rmarkdown/rmd/h/default.html --no-highlight --variable highlightjs=1 --number-sections --variable theme=cosmo --include-in-header /tmp/RtmpIOyqS2/rmarkdown-str63a542058359.html --mathjax --variable 'mathjax-url:https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML' 
  Could not fetch http://ccl.northwestern.edu/images/creativecommons/byncsa.png
  HttpExceptionRequest Request {
    host                 = "ccl.northwestern.edu"
    port                 = 80
    secure               = False
    requestHeaders       = []
    path                 = "/images/creativecommons/byncsa.png"
    queryString          = ""
    method               = "GET"
    proxy                = Nothing
    rawBody              = False
    redirectCount        = 10
    responseTimeout      = ResponseTimeoutDefault
    requestVersion       = HTTP/1.1
  }
   ConnectionTimeout
  ══ Failed tests ════════════════════════════════════════════════════════════════
  ── Error (test-nldoc.R:14:5): nldoc ────────────────────────────────────────────
  Error: pandoc document conversion failed with error 61
  Backtrace:
      █
   1. └─nlrx::nldoc(...) test-nldoc.R:14:4
   2.   └─nlrx:::nldoc_write_nldoc(...)
   3.     └─rmarkdown::render(mdfile)
   4.       └─rmarkdown:::convert(output_file, run_citeproc)
   5.         └─rmarkdown::pandoc_convert(...)
   6.           └─rmarkdown:::stop2(...)
  
  [ FAIL 1 | WARN 0 | SKIP 0 | PASS 0 ]
  Error: Test failures
  Execution halted