test: do not query system keyring on CRAN

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: openrouteservice
 Title: An 'openrouteservice' API Client
-Version: 0.6.0
+Version: 0.6.1
 Authors@R: c(
     person("Heidelberg Institute for Geoinformation Technology (HeiGIT) gGmbH", role = "cph"),
     person(c("Andrzej", "K."), "Oleś", email = "[email protected]", role = c("aut", "cre"), comment = c(ORCID = "0000-0003-0285-2787"))

tests/testthat/test-api_key.R

@@ -1,8 +1,12 @@
 context("Key management")
 
+on_cran <- function() {
+  !interactive() && !isTRUE(as.logical(Sys.getenv("NOT_CRAN", "false")))
+}
+
 ## record current state before starting any tests
 env <- Sys.getenv("ORS_API_KEY", NA);
-key <- tryCatch(keyring::key_get("openrouteservice"), error = function(e) NA)
+key <- tryCatch(if (on_cran()) NA else keyring::key_get("openrouteservice"), error = function(e) NA)
 
 ## restore initial state
 on.exit({