added xmltodict (for rs2d.py), pytest-xdist for parallel testing, and python 3.8 with compatible numpy versions

Author: kaustubhmote

noxfile.py

@@ -1,6 +1,7 @@
 import nox
 
 PYTHON_NUMPY_MATRIX = {
+    "3.8": ["1.23", "1.24"],
     "3.9": ["1.24", "1.25", "1.26", "2.0"],
     "3.10": ["1.24", "1.25", "1.26", "2.0", "2.1", "2.2"],
     "3.11": ["1.24", "1.25", "1.26", "2.0", "2.1", "2.2", "2.3"],
@@ -11,7 +12,7 @@
 
 ALL_NUMPY_VERSIONS = tuple(set(sum(PYTHON_NUMPY_MATRIX.values(), [])))
 
-DEPENDENCIES = ["pytest", "pluggy", "scipy"]
+DEPENDENCIES = ["pytest",  "pytest-xdist", "pluggy", "scipy", "xmltodict"]
 
 @nox.session(python=list(PYTHON_NUMPY_MATRIX.keys()))
 @nox.parametrize("numpy_version", ALL_NUMPY_VERSIONS)
@@ -38,4 +39,4 @@ def tests(session: nox.Session, numpy_version):
         "pytest",
         "--ignore=nmrglue/util/xcpy_test.py",
         *session.posargs
-    )
+    )