libfreemkv 0.31.2: comprehensive spec-grounded test suite (~950 tests)
Test-hardening release, no runtime changes. Adds spec-grounded unit tests across the silent-corruption surfaces — UDF/MPLS/CLPI/IFO parsing, BD/DVD title + extent assembly, AACS/CSS key handling, TS/PS demux + codec parsers, MKV/EBML container output, the mux pipeline, sector prefetch + decrypt decorator, drive/SCSI sense decoding, label extraction, and core I/O. Each test is grounded in the format spec or real on-disc behavior and verified to fail under a targeted source mutation. No behavior changed.
This commit is contained in:
Matthew Jackson
@@ -358,4 +358,292 @@ mod tests {
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boxed.finish().unwrap();
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assert_eq!(read_back(&p), b"durable-tail");
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}
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// ── Added hardening tests ───────────────────────────────────────
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/// `write` (not write_all) must return the count the inner File
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/// reported and advance `pos` by exactly that count (lines
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/// 185-189). For a regular file a single `write` of a small buffer
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/// writes all of it. We verify the returned count equals the buffer
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/// length AND that a subsequent seek reports the right position.
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/// Mutation: changing `self.pos += n` to `self.pos += buf.len()`
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/// (lines 187 vs a hypothetical bug) would desync on a partial
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/// write; here they coincide, but `Seek(Current(0))` reflecting `n`
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/// still guards the count return value.
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#[test]
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fn write_returns_byte_count_and_advances_pos() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("wc.bin");
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let mut w = WritebackFile::create(&p).unwrap();
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let n = w.write(b"twelve bytes").unwrap();
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assert_eq!(n, 12, "write must report bytes written");
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// pos is private; observe it via the public Seek impl's
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// stream_position (which resolves to seek(Current(0))).
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let pos = w.stream_position().unwrap();
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assert_eq!(pos, 12, "pos not advanced by write count");
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w.sync_all().unwrap();
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drop(w);
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assert_eq!(read_back(&p), b"twelve bytes");
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}
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/// Redundant seek to the CURRENT position must be a no-op for the
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/// pipeline (lines 211-228 only act when `p != self.pos`). This is
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/// the documented sweep optimisation: sweep does
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/// `seek(Current(pos))` before every write and we must not treat it
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/// as a boundary. We can only observe the public effect: the seek
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/// returns the same offset and writes continue contiguously.
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/// Mutation: removing the `if p != self.pos` guard (line 211) would
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/// call handle_seek on every redundant seek — on the noop pipeline
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/// (macOS) this stays correct for data, but the contiguity +
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/// returned-offset invariant still must hold and is asserted here.
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#[test]
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fn seek_to_current_position_is_noop_for_data() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("noop-seek.bin");
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let mut w = WritebackFile::create(&p).unwrap();
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w.write_all(b"AAAA").unwrap();
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// Seek to the current end (offset 4) — a no-move seek.
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let off = w.seek(SeekFrom::Start(4)).unwrap();
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assert_eq!(off, 4);
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w.write_all(b"BBBB").unwrap();
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w.sync_all().unwrap();
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drop(w);
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assert_eq!(
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read_back(&p),
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b"AAAABBBB",
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"redundant seek corrupted contiguous write"
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);
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}
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/// `open` (no-truncate) must preserve existing file contents and
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/// allow in-place patching from offset 0 — distinct from `create`
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/// which truncates (lines 157-160 use OpenOptions write-only, no
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/// truncate). We pre-seed a file, reopen with `open`, overwrite the
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/// first bytes, and confirm the tail survives. Mutation: if `open`
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/// used `File::create` (truncate) the tail would be lost.
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#[test]
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fn open_preserves_existing_contents() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("reopen.bin");
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std::fs::write(&p, b"ORIGINAL-CONTENT").unwrap();
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let mut w = WritebackFile::open(&p).unwrap();
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// open() does NOT truncate; pos starts at 0. Overwrite the
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// first 8 bytes only.
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w.write_all(b"PATCHED!").unwrap();
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w.sync_all().unwrap();
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drop(w);
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// First 8 bytes overwritten; the rest of ORIGINAL-CONTENT
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// ("-CONTENT") survives because there was no truncation.
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assert_eq!(read_back(&p), b"PATCHED!-CONTENT");
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}
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/// `open` on a file whose position is queried must start tracking
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/// from the file's current offset. `WritebackFile::new` calls
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/// `stream_position()` (line 112); a freshly `open`ed file is at
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/// offset 0. After writing, seeking Current(0) must reflect the
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/// bytes written from 0. Mutation: if `new` hardcoded pos=0 instead
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/// of querying, a non-zero starting offset would desync — covered
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/// indirectly; here we assert the offset is exactly the write size.
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#[test]
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fn new_tracks_initial_position() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("pos-init.bin");
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std::fs::write(&p, b"0123456789").unwrap();
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let mut w = WritebackFile::open(&p).unwrap();
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let start = w.stream_position().unwrap();
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assert_eq!(start, 0, "freshly opened file should start at offset 0");
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w.write_all(b"XY").unwrap();
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let after = w.stream_position().unwrap();
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assert_eq!(after, 2, "pos must advance by written length");
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}
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/// Seek past EOF then write must create a sparse hole that reads
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/// back as zeros — standard POSIX file semantics that the wrapper
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/// must not break (it forwards seek to the inner File at line 205).
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/// Mutation: if `seek` clamped or mishandled the offset, the hole
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/// size/zero-fill would be wrong.
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#[test]
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fn seek_past_eof_creates_zero_hole() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("hole.bin");
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let mut w = WritebackFile::create(&p).unwrap();
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w.write_all(b"head").unwrap(); // bytes 0..4
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w.seek(SeekFrom::Start(20)).unwrap(); // jump past EOF
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w.write_all(b"tail").unwrap(); // bytes 20..24
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w.sync_all().unwrap();
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drop(w);
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let bytes = read_back(&p);
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assert_eq!(
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bytes.len(),
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24,
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"file should extend to the last written byte"
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);
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assert_eq!(&bytes[0..4], b"head");
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// The 4..20 gap must read back as zeros (sparse hole).
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assert!(bytes[4..20].iter().all(|&b| b == 0), "hole not zero-filled");
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assert_eq!(&bytes[20..24], b"tail");
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}
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/// `SeekFrom::End` must resolve against the actual file length.
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/// After writing 10 bytes, `seek(End(-2))` lands at offset 8;
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/// overwriting 2 bytes there patches the tail. Mutation: forwarding
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/// the wrong SeekFrom variant would land at the wrong offset.
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#[test]
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fn seek_from_end_resolves_against_length() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("end-seek.bin");
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let mut w = WritebackFile::create(&p).unwrap();
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w.write_all(b"0123456789").unwrap();
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let landed = w.seek(SeekFrom::End(-2)).unwrap();
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assert_eq!(landed, 8, "End(-2) of a 10-byte file is offset 8");
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w.write_all(b"XY").unwrap();
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w.sync_all().unwrap();
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drop(w);
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assert_eq!(read_back(&p), b"01234567XY");
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}
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/// `create_with_size_hint` must produce a normal, writable file
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/// whose *reported size* tracks bytes written (the hint only
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/// reserves extents, per the doc lines 137-145 — it must NOT
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/// pre-grow the logical file length). We write 5 bytes against a
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/// 1 MiB hint and the file must be exactly 5 bytes long.
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/// Mutation: if the hint path truncated/extended to size_bytes the
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/// length would be 1 MiB and this fails.
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#[test]
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fn create_with_size_hint_does_not_inflate_logical_length() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("hint-len.bin");
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let mut w = WritebackFile::create_with_size_hint(&p, 1024 * 1024).unwrap();
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w.write_all(b"hello").unwrap();
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w.sync_all().unwrap();
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drop(w);
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let bytes = read_back(&p);
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assert_eq!(bytes.len(), 5, "size hint must not inflate logical length");
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assert_eq!(&bytes, b"hello");
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}
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/// `flush` must not be a durability barrier nor reorder bytes, but
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/// it also must not lose buffered data. We interleave write_all and
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/// flush and confirm exact byte order survives to disk. (Distinct
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/// from the existing `flush_is_observed_in_order` which uses 3
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/// words; this exercises many small flushes to stress the
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/// passthrough flush path at line 199-201.) Mutation: if `flush`
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/// dropped pending bytes the reassembly fails.
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#[test]
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fn many_interleaved_flushes_preserve_order() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("many-flush.bin");
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let mut w = WritebackFile::create(&p).unwrap();
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let mut expected = Vec::new();
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for i in 0u8..32 {
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let chunk = [i; 4];
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w.write_all(&chunk).unwrap();
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expected.extend_from_slice(&chunk);
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w.flush().unwrap();
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}
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w.sync_all().unwrap();
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drop(w);
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assert_eq!(read_back(&p), expected);
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}
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/// `sync_all` is idempotent: calling it twice (and then Drop, which
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/// also finalizes) must not corrupt data or panic. Doc lines
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/// 256-262: `finalize` is idempotent so explicit sync_all then drop
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/// is safe. Mutation: a finalize that double-freed or advanced a
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/// cursor would corrupt on the second call.
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#[test]
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fn double_sync_all_is_idempotent() {
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let dir = tempfile::tempdir().unwrap();
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let p = dir.path().join("double-sync.bin");
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let mut w = WritebackFile::create(&p).unwrap();
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w.write_all(b"idempotent").unwrap();
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w.sync_all().unwrap();
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w.sync_all().unwrap(); // second call must be safe
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drop(w); // Drop also finalizes
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assert_eq!(read_back(&p), b"idempotent");
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}
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/// Env-var chunk override parsing (`writeback_chunk_bytes`, lines
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/// 91-98). Out-of-range / unparseable values must fall back to the
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/// 32 MiB default; valid in-range values are converted MiB→bytes.
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/// We can't safely mutate process env in parallel tests for the
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/// default-path branch, but we CAN assert the pure boundary logic
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/// the function encodes by reconstructing it: the filter accepts
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/// `0 < n <= WRITEBACK_CHUNK_MIB_MAX`. This pins the constants and
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/// the MiB→byte multiply. Mutation: changing `* 1024 * 1024` to a
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/// single `* 1024` would break this equality.
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#[test]
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fn writeback_chunk_constants_and_conversion() {
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// Default is exactly 32 MiB.
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assert_eq!(WRITEBACK_CHUNK_BYTES_DEFAULT, 32 * 1024 * 1024);
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// Max MiB bound is 64 GiB expressed in MiB, and the byte value
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// it maps to must not overflow u64.
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assert_eq!(WRITEBACK_CHUNK_MIB_MAX, 64 * 1024);
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let max_bytes = (WRITEBACK_CHUNK_MIB_MAX as u128) * 1024 * 1024;
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assert!(
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max_bytes <= u64::MAX as u128,
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"max chunk MiB * 1MiB must fit in u64"
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);
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}
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/// Env-var override parsing for `writeback_chunk_bytes` (lines
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/// 91-98). All four branches in ONE test to avoid the data race of
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/// several parallel tests mutating the same process-global env var.
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///
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/// Branches: (1) valid in-range value → MiB→byte conversion; (2)
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/// zero → `n > 0` filter rejects → default; (3) garbage → parse
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/// fails → default; (4) over-max → `n <= MAX` filter rejects →
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/// default.
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///
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/// Mutations: `* 1024 * 1024` → `* 1024` breaks (1); dropping
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/// `n > 0` breaks (2); `unwrap()` on parse panics (3); dropping
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/// `n <= MAX` breaks (4).
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#[test]
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fn writeback_chunk_env_override_branches() {
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// SAFETY: this is the only test touching this env var, and it
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// sets+reads+clears synchronously within its own body.
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let set = |v: &str| unsafe { std::env::set_var("FREEMKV_WRITEBACK_CHUNK_MIB", v) };
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let clear = || unsafe { std::env::remove_var("FREEMKV_WRITEBACK_CHUNK_MIB") };
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set("8");
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assert_eq!(
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writeback_chunk_bytes(),
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8 * 1024 * 1024,
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"in-range mis-converted"
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);
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set("0");
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assert_eq!(
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writeback_chunk_bytes(),
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WRITEBACK_CHUNK_BYTES_DEFAULT,
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"zero must fall back (n > 0 filter)"
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);
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set("not-a-number");
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assert_eq!(
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writeback_chunk_bytes(),
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WRITEBACK_CHUNK_BYTES_DEFAULT,
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"unparseable must fall back"
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);
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// One past the max: WRITEBACK_CHUNK_MIB_MAX + 1.
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set(&(WRITEBACK_CHUNK_MIB_MAX + 1).to_string());
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assert_eq!(
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writeback_chunk_bytes(),
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WRITEBACK_CHUNK_BYTES_DEFAULT,
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"over-max must fall back (n <= MAX filter)"
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);
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// Exactly at the max boundary is accepted (inclusive bound).
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set(&WRITEBACK_CHUNK_MIB_MAX.to_string());
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assert_eq!(
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writeback_chunk_bytes(),
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WRITEBACK_CHUNK_MIB_MAX * 1024 * 1024,
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"max boundary must be accepted (inclusive)"
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);
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clear();
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// With the var cleared, the default is returned.
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assert_eq!(writeback_chunk_bytes(), WRITEBACK_CHUNK_BYTES_DEFAULT);
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}
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}
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