use testthat version 3+

[TSchiefer]

needed a little workaround for checking if a type is factor, cause expect_type() uses type_of and:

factor_var <- factor(c(1,2))
testthat::expect_type(factor_var, "factor")
#> Error: `factor_var` has type 'integer', not 'factor'.
typeof(factor_var)
#> [1] "integer"

^{Created on 2021-12-02 by the reprex package (v2.0.1)}

closes #48

[codecov[bot]]

Codecov Report

Merging #51 (f5158fb) into main (e0b4858) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   71.32%   71.32%           
=======================================
  Files          17       17           
  Lines         701      701           
=======================================
  Hits          500      500           
  Misses        201      201           

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[TSchiefer]

FYI: test are probably failing cause there was an issue with https://packagemanager.rstudio.com/

[krlmlr]

Thanks!