+geotiff,2026-05-12,1740,HIGH,4,"Pass 12 (2026-05-12): added test_gpu_writer_overview_mode_and_compression_level_1740.py closing Cat 4 HIGH and Cat 4 MEDIUM parameter-coverage gaps. (1) write_geotiff_gpu(overview_resampling='mode') and the dedicated _block_reduce_2d_gpu mode-fallback branch (_gpu_decode.py:3051-3056) had zero direct tests; six of the seven overview_resampling modes were covered (mean/nearest by test_features, min/max/median by pass 6, cubic by test_signature_parity_1631) but mode was the odd one out -- a regression dropping the mode dispatch from _block_reduce_2d_gpu would fall through to the mean reshape branch and emit wrong overview pixels for integer rasters. (2) write_geotiff_gpu(compression_level=) documented as accepted-but-ignored had no test; the CPU writer rejects out-of-range levels with ValueError, the GPU writer is documented not to -- a regression wiring the GPU writer up to the CPU range validator would silently break every to_geotiff(gpu=True, compression_level=X) caller for in-range levels and noisily for out-of-range. 19 tests, all passing on GPU host: _block_reduce_2d_gpu(method='mode') CPU-parity on 4x4 deterministic + random 8x8 + dtype-preserved across u8/u16/i16/i32, write_geotiff_gpu(cog=True, overview_resampling='mode') end-to-end round trip, to_geotiff(gpu=True, ..., overview_resampling='mode') dispatcher thread-through, GPU-vs-CPU pixel parity on 8x8 input, write_geotiff_gpu(compression_level=) in-range matrix on zstd/deflate, out-of-range matrix (zstd=999/-5, deflate=50/0) accepted without raising + round-trip preserved, to_geotiff(gpu=True, compression_level=999) dispatcher thread-through, companion CPU rejects-OOR pin to lock the asymmetry. Mutation against the mode branch (drop the 'if method == mode' block in _block_reduce_2d_gpu) flipped 9 mode tests red. Filed issue #1740. Pass 11 (2026-05-12): added test_gpu_writer_cpu_fallback_codecs_2026_05_12.py closing a Cat 4 HIGH parameter-coverage gap on write_geotiff_gpu compression= modes for the CPU-fallback codecs (lzw, packbits, lz4, lerc, jpeg2000/j2k). Pass 7 (test_gpu_writer_compression_modes_2026_05_11) covered only none/deflate/zstd/jpeg; the remaining five codecs route through dedicated branches in gpu_compress_tiles (_gpu_decode.py:2974-3019) with CPU fallbacks (lerc_compress, jpeg2000_compress, cpu_compress) that had zero direct tests via write_geotiff_gpu. A regression in routing/tag-wiring/fallback dispatch would ship silently because the internal reader uses the same compression-tag table. 17 tests, all passing on GPU host: lzw/packbits/lz4 round-trip + compression-tag pin on uint16, lerc lossless float32 + uint16 round-trip + tag pin, jpeg2000 uint8 single-band + RGB multi-band lossless round-trip + j2k-alias parity + tag pin, GPU-vs-CPU writer pixel parity for lzw/packbits, to_geotiff(gpu=True, compression=lzw/packbits) dispatcher thread-through. Mutation against compression dispatch (swap lzw bytes to zstd; swap lerc bytes to deflate) flipped round-trip tests red. Filed issue #1706. Pass 10 (2026-05-12): added test_kwarg_behaviour_2026_05_12_v2.py closing two Cat 4 HIGH parameter-coverage gaps. (1) write_geotiff_gpu(predictor=True/2/3) had zero direct tests; the GPU writer threads predictor= through normalize_predictor and gpu_compress_tiles into five CUDA encode kernels (_predictor_encode_kernel_u8/u16/u32/u64 for predictor=2, _fp_predictor_encode_kernel for predictor=3) and a regression dropping the encode-kernel calls would ship corrupt files. (2) read_vrt(window=) had no behaviour tests (only a signature pin in test_signature_annotations_1654); the kwarg is documented and _vrt.read_vrt implements full windowed-read semantics (clip, multi-source overlap, src/dst scaling, GeoTransform origin shift on coords + attrs['transform']). 23 tests, all passing on GPU host: predictor=True/2 round-trips on u8/u16/i32 + 3-band RGB samples_per_pixel stride; predictor=3 lossless round-trip on f32 and f64; predictor=3 int-dtype ValueError (CPU/GPU parity); CPU/GPU pixel-exact parity for pred=2 u16 and pred=3 f32; read_vrt(window=) subregion + full + clamp-overflow + clamp-negative + 2x1 mosaic seam straddle + offset past seam + transform-attr origin shift + y/x coords half-pixel shift + window+band + window+chunks (dask) + window+gpu (cupy) + window+gpu+chunks (dask+cupy). Mutation against the encode dispatch flipped 7 predictor tests red. Filed issue #1690. Pass 9 (2026-05-12): added test_kwarg_behaviour_2026_05_12.py closing three Cat 4 MEDIUM parameter-coverage gaps plus one Cat 4 LOW error path. write_vrt documented kwargs (relative/crs_wkt/nodata) had a smoke-test pinning that the kwargs are accepted but no test verified the override *effect* -- a regression dropping the override branch and silently using the default-from-first-source would ship undetected. read_geotiff_gpu(dtype=) cast had zero direct tests; the eager path has TestDtypeEager and dask has TestDtypeDask but the GPU branch had no equivalent. write_geotiff_gpu(bigtiff=) threads through to _assemble_tiff(force_bigtiff=) but no test asserted the on-disk header byte switches; the CPU writer had it via test_features::test_force_bigtiff_via_public_api. write_vrt(source_files=[]) ValueError was uncovered. 26 tests, all passing on GPU host: write_vrt relative=True/False XML attribute + path inspection + parse-back round-trip, write_vrt crs_wkt= override distinct-from-default XML check, write_vrt nodata= override + default-from-source coverage, write_vrt([]) ValueError + no-file side effect, read_geotiff_gpu dtype= matrix (float64->float32, float64->float16, uint16->int32, uint16->uint8, float-to-int raise, dtype=None preserves native), open_geotiff(gpu=True, dtype=) dispatcher, read_geotiff_gpu(chunks=, dtype=) dask+GPU branch, write_geotiff_gpu bigtiff=True/False/None header verification, to_geotiff(gpu=True, bigtiff=True) dispatcher thread-through. Pass 8 (2026-05-11): added test_lz4_compression_level_2026_05_11.py closing Cat 4 MEDIUM parameter-coverage gap on compression='lz4' + compression_level=. _LEVEL_RANGES advertises lz4: (0, 16) but only deflate (1, 9) and zstd (1, 22) had direct level boundary + round-trip + reject tests. The range check is the gatekeeper -- lz4_compress silently accepts any int level -- so a regression dropping 'lz4' from _LEVEL_RANGES would ship undetected. 18 tests, all passing: round-trip at levels 0/1/9/16 (lossless), default-level no-arg path, higher-level-not-larger smoke check on compressible input, out-of-range reject at -1/-10/17/100 on eager path, valid-range message format pin (lz4 valid: 0-16), dask streaming round-trip at 0/1/8/16, dask streaming out-of-range reject at -1/17/50 (separate _LEVEL_RANGES call site). Pass 7 (2026-05-11): added test_gpu_writer_compression_modes_2026_05_11.py closing Cat 4 HIGH gap on write_geotiff_gpu compression= modes. The writer documents zstd (default, fastest GPU), deflate, jpeg, and none, but only deflate + none had round-trip tests; the default zstd and the jpeg (nvJPEG/Pillow) paths shipped without targeted coverage. 11 new tests, all passing on GPU host: zstd round-trip + default-codec pinning, jpeg round-trip on 3-band RGB uint8 + 1-band greyscale, TIFF compression-tag header check across none/deflate/zstd/jpeg, plain deflate + none round-trips outside the COG/sentinel paths, and a cross-codec lossless parity check (zstd/deflate/none agree pixel-exact). nvJPEG path was exercised live, not just the Pillow fallback. Pass 6 (2026-05-11): added test_overview_resampling_min_max_median_2026_05_11.py covering Cat 4 HIGH parameter-coverage gap on overview_resampling=min/max/median. CPU end-to-end paths were already covered by test_cog_overview_nodata_1613::test_cpu_cog_overview_aggregations_ignore_sentinel; the GPU end-to-end paths and the direct CPU+GPU block-reducer branches had no targeted tests, so a regression on those code paths would ship undetected. 26 tests, all passing on GPU host: block-reducer unit tests (finite + partial-NaN), end-to-end COG writes for both to_geotiff and write_geotiff_gpu, CPU/GPU parity for to_geotiff(gpu=True), CPU nodata-sentinel regression check, and ValueError error-path tests for unknown method names on both backends. Pass 5 (2026-05-11): added test_degenerate_shapes_backends_2026_05_11.py covering Cat 3 HIGH geometric gaps (1x1 / 1xN / Nx1 reads on dask+numpy, GPU, dask+cupy backends; 1x1 / 1xN / Nx1 writes through write_geotiff_gpu) and Cat 2 MEDIUM NaN/Inf gaps (all-NaN read on GPU + dask+cupy, Inf / -Inf reads on all non-eager backends, NaN sentinel mask on dask read path including sentinel block split across chunk boundary). 23 tests, all passing on GPU host. Prior passes still hold: pass 4 (r4) closed read_geotiff_gpu/dask name= + max_pixels= kwargs (Cat 4), pass 3 (r3) closed read_vrt GPU/dask+GPU backend dispatch (Cat 1) and dtype/name kwargs (Cat 4)."
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