To run the tests, set "SITS_RUN_TESTS" environment to "YES" using
Sys.setenv("SITS_RUN_TESTS" = "YES")
To come back to the default behaviour, please set
Sys.setenv("SITS_RUN_TESTS" = "NO")
if (sits_run_tests()){
message("Tests will be run")
} else{
message(paste("Set the environmental variable SITS_RUN_TESTS to YES",
"to run the tests or use devtools::run_tests()"))
}