bug[next] Fix broken gpu tox setup (#1358)

And update gpu test which was broken in refactoring.

---------

Co-authored-by: Rico Häuselmann <ricoh@cscs.ch>

tests/next_tests/integration_tests/feature_tests/ffront_tests/test_gpu_backend.py

@@ -15,6 +15,7 @@
 import pytest
 
 import gt4py.next as gtx
+from gt4py.next import common
 from gt4py.next.program_processors.runners import dace_iterator, gtfn
 
 from next_tests.integration_tests import cases
@@ -26,26 +27,19 @@
 
 @pytest.mark.requires_gpu
 @pytest.mark.parametrize("fieldview_backend", [dace_iterator.run_dace_gpu, gtfn.run_gtfn_gpu])
-def test_copy(cartesian_case, fieldview_backend):  # noqa: F811 # fixtures
+def test_copy(fieldview_backend):  # noqa: F811 # fixtures
     import cupy as cp
 
     @gtx.field_operator(backend=fieldview_backend)
     def testee(a: cases.IJKField) -> cases.IJKField:
         return a
 
-    inp_arr = cp.full(shape=(3, 4, 5), fill_value=3, dtype=cp.int32)
-    outp_arr = cp.zeros_like(inp_arr)
-    inp = gtx.as_field([cases.IDim, cases.JDim, cases.KDim], inp_arr)
-    outp = gtx.as_field([cases.IDim, cases.JDim, cases.KDim], outp_arr)
-
-    testee(inp, out=outp, offset_provider={})
-    assert cp.allclose(inp_arr, outp_arr)
-
-    inp_field = gtx.full(
-        [cases.IDim, cases.JDim, cases.KDim], fill_value=3, allocator=fieldview_backend
-    )
-    out_field = gtx.zeros(
-        [cases.IDim, cases.JDim, cases.KDim], outp_arr, allocator=fieldview_backend
-    )
+    domain = {
+        cases.IDim: common.unit_range(3),
+        cases.JDim: common.unit_range(4),
+        cases.KDim: common.unit_range(5),
+    }
+    inp_field = gtx.full(domain, fill_value=3, allocator=fieldview_backend, dtype=cp.int32)
+    out_field = gtx.zeros(domain, allocator=fieldview_backend, dtype=cp.int32)
     testee(inp_field, out=out_field, offset_provider={})
     assert cp.allclose(inp_field.ndarray, out_field.ndarray)

tox.ini

@@ -82,9 +82,9 @@ set_env =
     PIP_EXTRA_INDEX_URL = {env:PIP_EXTRA_INDEX_URL:https://test.pypi.org/simple/}
 commands =
     nomesh-cpu: python -m pytest --cache-clear -v -n {env:NUM_PROCESSES:1} -m "not requires_atlas and not requires_gpu" {posargs} tests{/}next_tests
-    nomesh-gpu: python -m pytest --cache-clear -v -n {env:NUM_PROCESSES:1} -m "not requires_atlas and requires_gpu" {posargs} tests{/}next_tests
+    nomesh-{cuda,cuda11x,cuda12x}: python -m pytest --cache-clear -v -n {env:NUM_PROCESSES:1} -m "not requires_atlas and requires_gpu" {posargs} tests{/}next_tests
     atlas-cpu: python -m pytest --cache-clear -v -n {env:NUM_PROCESSES:1} -m "requires_atlas and not requires_gpu" {posargs} tests{/}next_tests
-    atlas-gpu: python -m pytest --cache-clear -v -n {env:NUM_PROCESSES:1} -m "requires_atlas and requires_gpu" {posargs} tests{/}next_tests
+    # atlas-{cuda,cuda11x,cuda12x}: python -m pytest --cache-clear -v -n {env:NUM_PROCESSES:1} -m "requires_atlas and requires_gpu" {posargs} tests{/}next_tests  # TODO(ricoh): activate when such tests exist
     pytest --doctest-modules src{/}gt4py{/}next
 
 [testenv:storage-py{38,39,310}-{internal,dace}-{cpu,cuda,cuda11x,cuda12x}]