Cover write_vrt / read_geotiff_gpu(dtype) / write_geotiff_gpu(bigtiff) kwargs (test-coverage sweep pass 9)

Close three Cat 4 MEDIUM parameter-coverage gaps plus one Cat 4 LOW
error path identified by the 2026-05-12 test-coverage sweep on the
geotiff module.

write_vrt's documented kwargs (relative/crs_wkt/nodata) were pinned
by an existing accepted-kwargs smoke test but no test verified the
override effect. A regression dropping any override branch and
silently using the default-from-first-source would not surface.
Verify the XML output for each kwarg directly: relativeToVRT
attribute + on-disk source path text for relative=, distinct WKT
marker for crs_wkt=, NoDataValue element for nodata=. Parse the VRT
back through parse_vrt to assert round-trips.

read_geotiff_gpu(dtype=) cast had zero direct tests. The eager CPU
path has TestDtypeEager (float64->float32, uint16->int32,
uint16->uint8, float-to-int raise, dtype=None preserves native);
the dask path has TestDtypeDask. The GPU branch had no equivalent.
Mirror the eager matrix on the GPU read path plus the dask+GPU
chunks branch and the open_geotiff(gpu=True, dtype=) dispatcher.

write_geotiff_gpu(bigtiff=) threads force_bigtiff through to
_assemble_tiff but no test asserted the on-disk header switched.
The CPU writer had it via test_features::test_force_bigtiff_via_public_api.
Add header parse_header().is_bigtiff checks for bigtiff=True/False/None
on write_geotiff_gpu plus the to_geotiff(gpu=True) dispatcher.

write_vrt(source_files=[]) ValueError error path was uncovered;
add it for completeness.

26 tests, all passing on GPU host.

Author: brendancol

.claude/sweep-test-coverage-state.csv

@@ -1,3 +1,3 @@
 module,last_inspected,issue,severity_max,categories_found,notes
-geotiff,2026-05-11,,HIGH,2;3;4,"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)."
+geotiff,2026-05-12,,MEDIUM,4,"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)."
 reproject,2026-05-10,,HIGH,1;4;5,"Added 39 tests: LiteCRS direct coverage, itrf_transform behaviour/roundtrip/array, itrf_frames, geoid_height numerical correctness + raster happy-path, vertical helpers (ellipsoidal<->orthometric/depth), reproject() lat/lon and latitude/longitude dim propagation. Note: _merge_arrays_cupy is imported but unused (no cupy merge dispatch in merge()); flagged as feature gap not test gap."