snapshot-file.md
In testthat: Unit Testing for R

expect_snapshot_file finds duplicate snapshot files

Code
  expect_snapshot_file(write_tmp_lines(r_version()), "version.txt", variant = r_version())
Condition
  Error in `expect_snapshot_file()`:
  ! Snapshot file names must be unique. `name` has already been used.

warns on first creation

Code
  out <- snapshot_file_equal_(path)
Condition
  Warning:
  Adding new file snapshot: 'tests/testthat/_snaps/my-test/test.txt'

Code
  snapshot_file_equal_("doesnt-exist.txt")
Condition
  Error in `snapshot_file_equal_()`:
  ! 'doesnt-exist.txt' not found.

generates informative hint

Code
  snapshot_hint("lala", reset_output = FALSE)
Output
  * Run `testthat::snapshot_accept("lala")` to accept the change.
  * Run `testthat::snapshot_review("lala")` to review the change.

expect_snapshot_file validates its inputs

Code
  expect_snapshot_file(123)
Condition
  Error in `expect_snapshot_file()`:
  ! `path` must be a single string, not the number 123.
Code
  expect_snapshot_file("doesnt-exist.txt")
Condition
  Error in `expect_snapshot_file()`:
  ! 'doesnt-exist.txt' doesn't exist.
Code
  expect_snapshot_file(path, 123)
Condition
  Error in `expect_snapshot_file()`:
  ! `name` must be a single string, not the number 123.
Code
  expect_snapshot_file(path, "test.txt", cran = "yes")
Condition
  Error in `expect_snapshot_file()`:
  ! `cran` must be `TRUE` or `FALSE`, not the string "yes".