tests/testthat/_snaps/download.md

In mongolmaps: Maps and Administrative Boundaries of Mongolia and Ulaanbaatar

.mm_asset() downloads once, verifies and caches

Code
  path <- .mm_asset("fake")
Message
  i Downloading Fake layer (0.0 MB); this happens once.

.mm_asset() rejects corrupt mirrored downloads

Code
  .mm_asset("fake")
Message
  i Downloading Fake layer (0.0 MB); this happens once.
Condition
  Error:
  ! The download of Fake layer is corrupt (checksum mismatch).
  i Try again; if it keeps failing, report it at <https://github.com/temuulene/mongolmaps/issues>.

upstream checksum changes only warn

Code
  path <- .mm_asset("fake")
Message
  i Downloading Fake layer (0.0 MB); this happens once.
Condition
  Warning:
  Fake layer changed upstream since this package version (checksum mismatch).
  i Using it anyway; results may differ from the documented data.

offline mode stops downloads with a clear error

Code
  .mm_asset("fake")
Condition
  Error:
  ! Can't download Fake layer: offline mode is on.
  i Turn it off with `options(mongolmaps.offline = FALSE)`, or prefetch layers with `mn_download()`.

no internet stops downloads with a clear error

Code
  .mm_asset("fake")
Condition
  Error:
  ! Can't download Fake layer: no internet connection.
  i Layers are downloaded once and cached; prefetch them with `mn_download()` while online.

.mm_http_download() turns HTTP failures into typed errors

Code
  .mm_http_download("https://example.org/missing.gpkg", path)
Condition
  Error:
  ! Download failed (status 404) [https://example.org/missing.gpkg].
  Caused by error in `httr2::req_perform()`:
  ! HTTP 404 Not Found.

.mm_manifest_row() finds layers and rejects unknown ones

Code
  .mm_manifest_row("nope")
Condition
  Error:
  ! Unknown data layer "nope". See `mn_sources()`.

mongolmaps documentation built on Oct. 10, 2026, 5:08 p.m.