Addition of Nox Testing

noxfile.py

@@ -0,0 +1,42 @@
+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"],
+    "3.12": ["1.26", "2.0", "2.1", "2.2", "2.3"],
+    "3.13": ["1.26", "2.0", "2.1", "2.2", "2.3"],
+    "3.14": ["2.0", "2.1", "2.2", "2.3"],
+}
+
+ALL_NUMPY_VERSIONS = tuple(set(sum(PYTHON_NUMPY_MATRIX.values(), [])))
+
+DEPENDENCIES = ["pytest",  "pytest-xdist", "pluggy", "scipy", "xmltodict"]
+
+@nox.session(python=list(PYTHON_NUMPY_MATRIX.keys()))
+@nox.parametrize("numpy_version", ALL_NUMPY_VERSIONS)
+def tests(session: nox.Session, numpy_version):
+    """
+    Main test function
+
+    Parameters
+    ----------
+    session : nox.Session
+        current nox session
+    numpy_version : str
+        numpy version to test
+
+    """
+    py_version = session.python
+    if numpy_version not in PYTHON_NUMPY_MATRIX[py_version]:
+        session.skip(f"NumPy version '{numpy_version}' is not supported on Python {py_version}")
+        return
+
+    numpy_dep = f"numpy=={numpy_version}.*"
+    session.install(".", numpy_dep, *DEPENDENCIES)
+    session.run(
+        "pytest",
+        "--ignore=nmrglue/util/xcpy_test.py",
+        *session.posargs
+    )