TST: Update pixi.toml with cupy tests

Author: steppi

pixi.toml

@@ -130,8 +130,43 @@ coverage.cmd = [
 coverage.depends-on = ["tests-ci"]
 coverage.cwd = "."
 
+# CuPy tests
+[feature.cupy-tests]
+platforms = ["linux-64"]
+
+[feature.cupy-tests.dependencies]
+python = ">=3.12.0,<3.13"
+pip = "*"
+setuptools = "*"
+cupy = "*"
+pytest = "*"
+pytest-forked = "*"
+
+[feature.cupy-tests.tasks]
+# Since CuPy tests are only available on Linux, we can use bash like
+# this to only clone xsref if it isn't already there and checked out
+# at the proper tag.
+clone-xsref-test-cupy.cmd = """
+bash -c '
+if [ -d xsref ]; then
+  tag=$(git -C xsref describe --tags --exact-match 2>/dev/null || true)
+fi
+if [ \"$tag\" != v0.0.0 ]; then
+  rm -rf xsref
+  git clone --branch v0.0.0 --depth 1 https://github.com/scipy/xsref.git
+fi
+'
+"""
+clone-xsref-test-cupy.cwd = "."
+install-xsref-test-cupy.cmd = "pip install ."
+install-xsref-test-cupy.cwd = "xsref"
+install-xsref-test-cupy.depends-on = ["clone-xsref-test-cupy"]
+test-cupy.cmd = "pytest --forked python_tests/test_cupy.py"
+test-cupy.cwd = "."
+test-cupy.depends-on = ["install-xsref-test-cupy"]
 
 [environments]
 default = { features = ["build", "tests"], solve-group = "default" }
 tests-ci = { features = ["build", "tests", "tests-ci", "coverage"], solve-group = "default" }
 lint = { features = ["clang-format"], solve-group = "default" }
+cupy-tests = { features = ["cupy-tests"], solve-group = "default" }