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kikootwo
01e61f3368
Switch unit tests to mock child_process.execFile and assert argv structure instead of a single shell command string. Add helpers (lastCallArgv, expectMetadataArg) and expand coverage to catch the #171 quote-regression, validate sanitization of invisible/whitespace/null chars, ensure no shell-quoting is introduced, and cover all format branches (m4b/mp3/flac). Add a new integration test suite that runs real ffmpeg/ffprobe (skips if binaries missing) to verify metadata round-trips byte-for-byte. Update metadata-tagger implementation (binary change) to use the argv-style spawn/execFile path expected by the tests.