testthat 3.1.2

• testthat now uses brio for all reading and writing (#1120). This
  ensures that snapshots always use "\n" to separate lines (#1516).

• expect_snapshot() no longer inadvertently trims trailing new lines off
  of errors and messages (#1509).

• If expect_snapshot() generates a snapshot with different value but
  still compares as equal (e.g. because you've set a numeric tolerance), the
  saved values no longer update if another snapshot in the same file changes.

• expect_snapshot() now only adds a .new file for the variants that
  actually changed, not all variants, while expect_snapshot_file() with
  variant with no longer immediately deletes .new files (#1468).

• expect_snapshot_file() gains a transform argument to match
  expect_snapshot() (#1474). compare now defaults to NULL, automatically
  guessing the comparison type based on the extension.

• expect_snapshot_file() now errors if the file being snapshot does not exist;
  SnapshotReporter also now treats the file directory as an absolute path
  (#1476, @malcolmbarrett)

• New expect_snapshot_warning() to match expect_snapshot_error() (#1532).

• JUnitReporter now includes skip messages/reasons (@rfineman, #1507)

• local_reproducible_output() gains a lang argument so that you can
  optionally override the language used to translate error messages (#1483).
  It also sets the global option cli.num_colors in addition to
  crayon.enabled.

• test_that() no longer inappropriately skips when calling expect_equal()
  when you've temporarily set the locale to non-UTF-8 (#1285).

• skip_if_offline() now automatically calls skip_on_cran() (#1479).

• snapshot_accept() and snapshot_review() now work with exactly the same
  file specification which can be a snapshot name, a file name, or a directory
  (#1546). They both work better with variants (#1508). Snapshot cleanup also
  removes all empty directories (#1457).

• When a snapshot changes the hint also mentions that you can use
  snapshot_review() (#1500, @DanChaltiel) and the message tells you what
  variant is active (#1540).