Skip clipboard test on CRAN

Author: hadley

tests/testthat/test-curl.R

@@ -152,8 +152,9 @@ test_that("can evaluate simple calls", {
 })
 
 test_that("can read from clipboard", {
-  # need to skip on CI as can't read from clipboard there on Linux
+  # need to skip on CI and CRAN as can't read from clipboard there
   skip_on_ci()
+  skip_on_cran()
   skip_if_not_installed("clipr")
   skip_if(getRversion() < "4.1")