check.md
In brand.yml: Unified Branding with a Simple YAML File

check_enum(): fails with an invalid single value

Code
  test_check_enum("X", values = letters[1:5])
Condition
  Error in `check_enum()`:
  ! `input` does not allow "X".
  i Values must be exactly one of "a", "b", "c", "d", and "e".

check_enum(): fails with multiple values exceeding max_len

Code
  test_check_enum(c("a", "b", "c"), values = letters[1:5], max_len = 2)
Condition
  Error in `check_enum()`:
  ! `input` must have at most 2 items, not 3 items.

check_enum(): fails with NULL when allow_null = FALSE

Code
  test_check_enum(NULL, values = letters[1:5], allow_null = FALSE)
Condition
  Error in `test_check_enum()`:
  ! `input` must be exactly one of `a`, `b`, `c`, `d`, `e`, not `NULL`.

check_enum(): fails with duplicates when allow_dups = FALSE

Code
  test_check_enum(c("a", "a"), values = letters[1:5], allow_dups = FALSE)
Condition
  Error in `check_enum()`:
  ! `input` must have at most 1 item, not 2 items.