Merge pull request #36 from asford/tox_config

Add tox test config.

.gitignore

@@ -5,4 +5,5 @@ __pycache__/
 build/
 dist/
 .coverage
-*.swp
+.tox/
+*.swp

tox.ini

@@ -0,0 +1,24 @@
+# content of: tox.ini , put in same dir as setup.py
+[tox]
+envlist = py38,py39,py310
+
+# tox-wheel: supports bdist install for future src layout
+# tox-conda: install python interpreter versions via conda
+requires =
+  tox-wheel
+  tox-conda
+
+[testenv]
+# include conda-forge channel to fetch python 3.11
+conda_channels = conda-forge
+
+# pytest command runs from root checkout
+# install via `setup.py develop` so build artifact is placed in source tree
+usedevelop = true
+
+# when package switches to src layout, remove usedevelop and switch to wheel install
+# wheel = true
+
+deps = pytest
+commands =
+    pytest