url_relative test fails with libxml2 2.9.10

[QuLogic]

Issue Description and Expected Result

The automatic rebuilds fail again with the libxml2 2.9.10 release.

Reproducible Example

Run build (including tests) on Fedora Rawhide or other system with libxml2 2.9.10.

Last 13 lines of output:
  > 
  > test_check("xml2")
  This is libxml2 version 2.9.10 
  -- 1. Failure: url_relative (@test-url.R#22)  ----------------------------------
  url_relative("http://hadley.nz/a/c", "http://hadley.nz/") not equal to "../a/c".
  1/1 mismatches
  x[1]: "a/c"
  y[1]: "../a/c"
  
  == testthat results  ===========================================================
  [ OK: 390 | SKIPPED: 4 | WARNINGS: 0 | FAILED: 1 ]
  1. Failure: url_relative (@test-url.R#22) 

I guess this is because the fix in 9b5426e does a string comparison of versions, for which '2.9.10' < '2.9.9'. I'm not sure how you can do a proper semver comparison in R.

Session Info

It's an automated build, so I can't really get this, sorry. You can check the root.log in the build link above for installed packages.

[jimhester]

Thanks, should now be fixed by using a semantic comparison rather than alphanumeric.

[QuLogic]

Thanks for the quick fix.