test: add pytest-randomly to cuda_pathfinder (#1269)

* test: add `pytest-randomly` to `cuda_pathfinder`

* ci: prevent randomized reordering in bindings/core test runs

Adding pytest-randomly for cuda_pathfinder currently affects bindings/core in shared CI jobs and exposes unrelated order-dependent failures. Disable collection reordering for bindings/core invocations to keep those suites stable while pathfinder adopts randomization.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: cpcloud

ci/tools/run-tests

@@ -47,9 +47,9 @@ elif [[ "${test_module}" == "bindings" ]]; then
     pip install $(ls "${CUDA_BINDINGS_ARTIFACTS_DIR}"/*.whl)[all] --group test
   fi
   echo "Running bindings tests"
-  ${SANITIZER_CMD} pytest -rxXs -v --durations=0 tests/
+  ${SANITIZER_CMD} pytest -rxXs -v --durations=0 --randomly-dont-reorganize tests/
   if [[ "${SKIP_CYTHON_TEST}" == 0 ]]; then
-    ${SANITIZER_CMD} pytest -rxXs -v --durations=0 tests/cython
+    ${SANITIZER_CMD} pytest -rxXs -v --durations=0 --randomly-dont-reorganize tests/cython
   fi
   popd
 elif [[ "${test_module}" == "core" ]]; then
@@ -80,11 +80,11 @@ elif [[ "${test_module}" == "core" ]]; then
     pip install $(ls "${CUDA_CORE_ARTIFACTS_DIR}"/*.whl)["cu${TEST_CUDA_MAJOR}"] --group "test-cu${TEST_CUDA_MAJOR}${FREE_THREADING}"
   fi
   echo "Running core tests"
-  ${SANITIZER_CMD} pytest -rxXs -v --durations=0 tests/
+  ${SANITIZER_CMD} pytest -rxXs -v --durations=0 --randomly-dont-reorganize tests/
   # Currently our CI always installs the latest bindings (from either major version).
   # This is not compatible with the test requirements.
   if [[ "${SKIP_CYTHON_TEST}" == 0 ]]; then
-    ${SANITIZER_CMD} pytest -rxXs -v --durations=0 tests/cython
+    ${SANITIZER_CMD} pytest -rxXs -v --durations=0 --randomly-dont-reorganize tests/cython
   fi
   popd
 fi