tests/testthat/_snaps/edge-cases.md

In automerge: R Bindings for 'Automerge' 'CRDT' Library

sync state operations with invalid pointers

Code
  am_sync_encode(doc1, "not a sync state")
Condition
  Error in `am_sync_encode()`:
  ! Expected external pointer for sync state

Code
  am_sync_encode(doc1, 123)
Condition
  Error in `am_sync_encode()`:
  ! Expected external pointer for sync state

Code
  am_sync_encode(doc1, list())
Condition
  Error in `am_sync_encode()`:
  ! Expected external pointer for sync state

sync decode with zero-length message

Code
  am_sync_decode(doc, sync_state, raw(0))
Condition
  Error in `am_sync_decode()`:
  ! Automerge error at sync.c:LINE: not enough input

sync decode with malformed message

Code
  am_sync_decode(doc, sync_state, bad_msg)
Condition
  Error in `am_sync_decode()`:
  ! Automerge error at sync.c:LINE: expected [66, 67] but found 158

Code
  am_sync_decode(doc, sync_state, as.raw(c(255, 255, 255)))
Condition
  Error in `am_sync_decode()`:
  ! Automerge error at sync.c:LINE: expected [66, 67] but found 255

am_fork with invalid heads list elements

Code
  am_fork(doc, heads = list(123))
Condition
  Error in `am_fork()`:
  ! All heads must be raw vectors (change hashes)

Code
  am_fork(doc, heads = list("not raw"))
Condition
  Error in `am_fork()`:
  ! All heads must be raw vectors (change hashes)

Code
  am_fork(doc, heads = list(raw(32), "invalid", raw(32)))
Condition
  Error in `am_fork()`:
  ! All heads must be raw vectors (change hashes)

am_apply_changes with empty and invalid lists

Code
  am_apply_changes(doc, list(123))
Condition
  Error in `am_apply_changes()`:
  ! All changes must be raw vectors (got type 14 at index 0)

Code
  am_apply_changes(doc, list("not raw"))
Condition
  Error in `am_apply_changes()`:
  ! All changes must be raw vectors (got type 16 at index 0)

am_apply_changes with malformed change data

Code
  am_apply_changes(doc, list(bad_change))
Condition
  Error in `am_apply_changes()`:
  ! Failed to apply change at index 0: unable to parse chunk: failed to parse header: Invalid magic bytes

am_get_change_by_hash with wrong size hash

Code
  am_get_change_by_hash(doc, raw(0))
Condition
  Error in `am_get_change_by_hash()`:
  ! Change hash must be exactly 32 bytes

Code
  am_get_change_by_hash(doc, raw(31))
Condition
  Error in `am_get_change_by_hash()`:
  ! Change hash must be exactly 32 bytes

cursor operations on non-text objects

Code
  am_cursor(map_obj, 0)
Condition
  Error in `am_cursor()`:
  ! Automerge error at cursors.c:LINE: invalid op for object of type `map`

marks on non-text objects

Code
  am_mark(list_obj, 0, 2, "bold", TRUE)
Condition
  Error in `am_mark()`:
  ! Automerge error at cursors.c:LINE: invalid op for object of type `list`

am_put with very large list position

Code
  am_put(doc, items, 10000, "last")
Condition
  Error in `am_put()`:
  ! Automerge error at objects.c:LINE: Invalid pos 9999

am_delete with out-of-bounds list position

Code
  am_delete(doc, items, 10)
Condition
  Error in `am_delete()`:
  ! Automerge error at objects.c:LINE: Invalid pos 9

cursor at boundary and beyond

Code
  am_cursor(text_obj, 4)
Condition
  Error in `am_cursor()`:
  ! Automerge error at cursors.c:LINE: index 4 is out of bounds

Code
  am_cursor(text_obj, 1000)
Condition
  Error in `am_cursor()`:
  ! Automerge error at cursors.c:LINE: index 1000 is out of bounds

marks at boundary and beyond

Code
  am_mark(text_obj, 0, 1000, "invalid", "value")
Condition
  Error in `am_mark()`:
  ! Automerge error at cursors.c:LINE: index 1000 is out of bounds

counter increment on non-existent keys

Code
  am_counter_increment(doc, AM_ROOT, "nonexistent", 1)
Condition
  Error in `am_counter_increment()`:
  ! Automerge error at objects.c:LINE: increment operations must be against a counter value

counter in empty list

Code
  am_counter_increment(doc, counters, 1, 1)
Condition
  Error in `am_counter_increment()`:
  ! Automerge error at objects.c:LINE: index 0 is out of bounds

create with various actor ID types

Code
  am_create(actor_id = "not-valid-hex")
Condition
  Error in `am_create()`:
  ! Automerge error at document.c:LINE: invalid actor ID `not-valid-hex`

sync with malformed state pointer

Code
  am_sync_encode(doc, list())
Condition
  Error in `am_sync_encode()`:
  ! Expected external pointer for sync state

Code
  am_sync_encode(doc, raw(10))
Condition
  Error in `am_sync_encode()`:
  ! Expected external pointer for sync state

malformed change hashes in fork heads

Code
  am_fork(doc, heads = list(raw(5)))
Condition
  Error in `am_fork()`:
  ! Invalid change hash at index 0

Code
  am_fork(doc, heads = list(as.raw(1:50)))
Condition
  Error in `am_fork()`:
  ! Invalid change hash at index 0

sync with corrupted message state

Code
  am_sync_decode(doc2, sync_state, bad_msg)
Condition
  Error in `am_sync_decode()`:
  ! Automerge error at sync.c:LINE: expected [66, 67] but found 0

operations with invalid change hashes

Code
  am_get_changes(doc, list(raw(5)))
Condition
  Error in `am_get_changes()`:
  ! Invalid change hash

Code
  am_get_changes(doc, list(as.raw(1:50)))
Condition
  Error in `am_get_changes()`:
  ! Invalid change hash

text operations with empty text objects

Code
  am_cursor(text_obj, 0)
Condition
  Error in `am_cursor()`:
  ! Automerge error at cursors.c:LINE: index 0 is out of bounds

automerge documentation built on Feb. 5, 2026, 5:08 p.m.