Add testthat

DESCRIPTION

@@ -25,8 +25,11 @@ Imports:
     ranger (>= 0.12.1),
     Rcpp,
     rlist
+Suggests: 
+    testthat (>= 3.0.0)
 LinkingTo: 
     Rcpp
+Config/testthat/edition: 3
 Encoding: UTF-8
 LazyData: true
 RoxygenNote: 7.2.3

tests/testthat.R

+# This file is part of the standard setup for testthat.
+# It is recommended that you do not modify it.
+#
+# Where should you do additional test configuration?
+# Learn more about the roles of various files in:
+# * https://r-pkgs.org/tests.html
+# * https://testthat.r-lib.org/reference/test_package.html#special-files
+
+library(testthat)
+library(RFSurrogates)
+
+test_check("RFSurrogates")