Explicitely require prettycode to avoid snapshot change.

Author: olivroy

tests/testthat/test-helpers.R

@@ -1,6 +1,7 @@
 
 
 test_that("can construct and print vertical", {
+  skip_if_not_installed("prettycode")
   expect_snapshot({
     construct_vertical(c("1 + 1", "nw"))
   })

tests/testthat/test-public_api-3.R

@@ -159,6 +159,7 @@ test_that("Can display warning on unset styler cache", {
 })
 
 test_that("No sensitive to decimal option", {
+  skip_if_not_installed("prettycode")
   withr::local_options(OutDec = ",")
   expect_snapshot({
     style_text("1")