I missed this duplicate test in the integration-tests package when I
added the Windows branch to notifier-desktop. The mock callback used the
3-arg execFile signature (cmd, args, cb) but the new win32 path calls
execFile with 4 args (cmd, args, opts, cb), so the callback landed in
the opts slot and "cb is not a function" broke CI on Linux.
Make the mock signature-agnostic and replace the win32 "no execFile,
warns" assertion with one that verifies the EncodedCommand toast script.
Add a separate freebsd case for the actual unsupported-platform path.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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