Skip test 1623 if '~' not defined

[mfansler]

Fixes #6576

This skips the test if "~" is undefined on the system. However, a better solution might be to test a directory that is guaranteed to exist, e.g., tempdir().

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.62%. Comparing base (315ab54) to head (9d4ca4f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6577   +/-   ##
=======================================
  Coverage   98.62%   98.62%           
=======================================
  Files          79       79           
  Lines       14450    14450           
=======================================
  Hits        14251    14251           
  Misses        199      199           

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[MichaelChirico]

a better solution might be to test a directory that is guaranteed to exist, e.g., tempdir().

I'm fairly confident that's done elsewhere, the reason I suggested a skip here is the reference issue is specifically about an attempt to read ~:

#989

so a regression test against that path specifically makes sense to me still.

[mfansler]

Sounds good!

[tdhock]

thanks for your analysis and PR!
I invited you to https://github.com/orgs/Rdatatable/teams/project-members so after accepting, please send future PRs from Rdatatable/data.table instead of your fork.