R Under development (unstable) (2025-02-15 r87726 ucrt) -- "Unsuffered Consequences"
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> Sys.setenv("R_TESTS" = "")
> library(testthat)
> library(Matrix)
> library(readsparse)
> test_check("readsparse")
[ FAIL 0 | WARN 0 | SKIP 10 | PASS 0 ]

══ Skipped tests (10) ══════════════════════════════════════════════════════════
• skip_tests is TRUE (10): 'test-read-write.R:16:5', 'test-read-write.R:48:5',
  'test-read-write.R:81:5', 'test-read-write.R:129:5',
  'test-read-write.R:165:5', 'test-read-write.R:238:5',
  'test-read-write.R:268:5', 'test-read-write.R:299:5',
  'test-read-write.R:326:5', 'test-read-write.R:358:5'

[ FAIL 0 | WARN 0 | SKIP 10 | PASS 0 ]
> 
> proc.time()
   user  system elapsed 
   1.20    0.17    1.37