Fun with processes
summary
A GenServer is built to stream large downloads with HTTPoison async_chunk so the whole file never loads into memory and the VM cannot be OOM killed, handling :async_chunk messages to write to a file and closing on :eof. handle_continue starts the request, handle_info processes chunks, and the state holds the target file and URL. Tests inject an injectable HTTP engine, trap exits, send synthetic chunk messages, assert the file contents and that the GenServer stops, and tests pass.
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