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Sibling tests in `test-external-open-lib-*.el` covered the pure helpers (`cj/external-open-command`, `cj/external-open-launcher-p`). This batch covers the user-facing wrappers:
- `cj/xdg-open`: posix path triggers `call-process` with the open program; errors when no file is associated; errors when no command resolves on the host.
- `cj/open-this-file-with`: errors outside a file-visiting buffer; posix path spawns a detached process via `call-process-shell-command` with `nohup ... >/dev/null 2>&1 &`.
- `cj/find-file-auto`: routes a `.mp4` (in `default-open-extensions`) to `cj/xdg-open`, passes `.txt` through to the original `find-file`, and falls through cleanly for a nil filename argument.
Host predicates, call-process, and the underlying `cj/xdg-open` are stubbed throughout.
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