R Under development (unstable) (2024-02-05 r85863 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(nat)
Loading required package: rgl
Registered S3 method overwritten by 'nat':
  method             from
  as.mesh3d.ashape3d rgl 
Some nat functions depend on a CMTK installation. See ?cmtk and README.md for details.

Attaching package: 'nat'

The following objects are masked from 'package:base':

    intersect, setdiff, union

> library(httr)
> 
> # suppress RGL in headless environments (some CRAN build machines fail otherwise)
> if(!interactive())
+   Sys.setenv(RGL_USE_NULL=TRUE)
> 
> # Is internet accessible?
> internet.ok = identical(
+   try(
+     status_code(
+       HEAD("http://flybrain.mrc-lmb.cam.ac.uk/", timeout(2))
+     ),
+     silent = TRUE
+   ),
+   200L
+ )
> 
> if(Sys.getenv('NOT_CRAN') == "true" && internet.ok) {
+   # note that we want to run all tests requiring internet access
+   Sys.setenv(NAT_INTERNET_TESTS="TRUE")
+   # Run all test files
+   test_check("nat")
+ } else {
+   # We're on CRAN or flybrain is inacessible, so don't run anything involving 
+   # remote files
+   Sys.setenv(NAT_INTERNET_TESTS="")
+   test_check("nat", filter="^[^.]+")
+ }
  adding: testdata/neuron/testneuron_am3d.am (deflated 45%)
  adding: testdata/neuron/testneuron_lineset.am (deflated 69%)
  adding: DA1/EBH11R.swc (deflated 53%)
  adding: DA1/EBH20R.swc (deflated 54%)
  adding: DA1/EBI12L.swc (deflated 54%)
  adding: DL3/EBH20L.swc (deflated 54%)
  adding: DL3/EBI22R.swc (deflated 53%)
[ FAIL 0 | WARN 0 | SKIP 6 | PASS 788 ]

══ Skipped tests (6) ═══════════════════════════════════════════════════════════
• On CRAN (3): 'test-cmtk.R:23:1', 'test-cmtkreg.R:58:3', 'test-ndigest.R:9:3'
• empty test (3): 'test-neuron-io.R:992:1', 'test-neuronlist.R:90:1',
  'test-potential_synapses.R:3:1'

[ FAIL 0 | WARN 0 | SKIP 6 | PASS 788 ]
> 
> proc.time()
   user  system elapsed 
  15.84    1.68   18.40