Switch from pytest-parallel to pytest-xdist

Author: kburns

dedalus/tests/__init__.py

@@ -11,7 +11,9 @@
 
 def base_cmd():
     workers = os.getenv("PYTEST_WORKERS", "auto")
-    return [f"--ignore={testpath}/test_spherical_ncc.py", f"--ignore={testpath}/test_cylinder_ncc.py", f"--workers={workers}"]
+    ignore_options = [f"--ignore={testpath}/test_spherical_ncc.py", f"--ignore={testpath}/test_cylinder_ncc.py"]
+    xdist_options = [f"-n={workers}", "--dist=worksteal"]
+    return ignore_options + xdist_options
 
 def test(report=False):
     """Run tests."""

setup.py

@@ -191,7 +191,7 @@ def read(rel_path):
     "pytest",
     "pytest-benchmark",
     "pytest-cov",
-    "pytest-parallel",
+    "pytest-xdist",
     "scipy >= 1.4.0",
     "xarray"]