On Tue, 14 Jan 2020 at 15:06, Siegfried Köstlmeier
<siegfried.koestlme...@gmail.com> wrote:
>
> Hi all,
>
> I maintain the package „qrandom“ which is based on a web API. In last time
> the testthat tests failed because the website was down.
> I implemented the following code in v1.2.2 to ensure that tests are only run
> if the website is accessible and to avoid the CRAN checks to fail:
>
> > library(testthat)
> > library(qrandom)
>
> > check_qrng <- function(){
> > tryCatch(
> > expr = {
> > req <- curl::curl_fetch_memory('https://qrng.anu.edu.au/index.php')
> > req$status_code
> > },
> > error = function(e){
> > -1
> > }
> > )
> > }
>
> > ## test package separated with filter due to limited Travis-CI build time
> > ## HTTP status 200 indicates “OK”
> > if(curl::has_internet() & check_qrng() == 200){
> > test_check('qrandom', filter = "qrandom")
> > test_check('qrandom', filter = "qrandomunif")
> > test_check('qrandom', filter = "qrandomnorm")
> > test_check('qrandom', filter = "qUUID")
> > test_check('qrandom', filter = "qrandommaxint")
> > }
>
> I was informed that the check results
> <https://cran.r-project.org/web/checks/check_results_qrandom.html> had an
> error status for both flavor r-devel-linux-x86_64-fedora-clang and
> r-devel-linux-x86_64-fedora-gcc, while the other platforms showed the status
> “OK”. Currently, the status is “OK” for all updated package versions 1.2.2
> because the website is available again.
>
> What is it that the above code does not prevent the checks to be run if the
> website is not available specifically on Fedora systems? May it be that curl
> is platform dependent or are CRAN package checks run different here? I would
> be pleased to avoid these check fails in future.
Since you use testthat, you can use skip_on_cran() to skip tests that
require an Internet connection. Yet it would be a better idea to mock
those tests on CRAN (see packages vcr, webmockr, httptest, and
probably others).
Iñaki
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