Add tox and pytest configuration

tox.ini

@@ -0,0 +1,30 @@
+# tox configuration
+[tox]
+envlist = py39
+skipsdist = True
+
+[gh-actions]
+python =
+    3.9: py39
+
+[testenv]
+deps =
+    pytest
+    pytest-xdist
+    pytest-split
+    #cocotb
+    git+https://github.com/cocotb/cocotb.git@e892a3ea48#egg=cocotb
+    cocotb-test
+    cocotbext-axi
+    jinja2
+
+commands =
+    pytest -n auto
+
+# pytest configuration
+[pytest]
+testpaths =
+    tb
+addopts =
+    --ignore-glob=tb/test_*.py
+    --import-mode importlib