Check that snapshots always strip \r (#2004)

Closes  #1958

tests/testthat/_snaps/snapshot.md

@@ -44,6 +44,14 @@
       Error in `f()`:
       ! 4
 
+# line-endings fixed before comparison
+
+    Code
+      cat(x)
+    Output
+      a
+      b
+
 # multiple outputs of same type are collapsed
 
     Code

tests/testthat/test-snapshot.R

@@ -30,6 +30,11 @@ test_that("empty lines are preserved", {
   expect_snapshot(f(), error = TRUE)
 })
 
+test_that("line-endings fixed before comparison", {
+  x <- "a\n\rb"
+  expect_snapshot(cat(x))
+})
+
 test_that("multiple outputs of same type are collapsed", {
   expect_snapshot({
     x <- 1

tests/testthat/test-verify-output.R

@@ -91,3 +91,9 @@ test_that("verify_exec() doesn't leave tempfiles around", {
 
   expect_equal(before, after)
 })
+
+test_that("verify_exec() strips CR", {
+  act <- verify_exec(quote(cat("\r\n")))
+  exp <- verify_exec(quote(cat("\n")))
+  expect_equal(act[-1], exp[-1])
+})