fix: Check testthat
availabililty before return
#90
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Intent
This PR fixes an issue where dplyr
*_join
s fail if testthat is not installed.Approach
In
join_warn()
andjoin_warn_experimental()
, check if testthat is installed before callingtestthat::is_testing()
.Known issues
N/A
Checklist
NEWS.md