Add tox.ini

tox.ini

@@ -0,0 +1,33 @@
+# For more information about tox, see https://tox.readthedocs.io/en/latest/
+[tox]
+envlist = py{38,39}-{linux,macos,windows}
+
+[gh-actions]
+python =
+    3.8: py38
+    #3.9: py39
+
+[gh-actions:env]
+PLATFORM =
+    ubuntu-latest: linux
+    macos-latest: macos
+    windows-latest: windows
+
+[testenv]
+platform = 
+    macos: darwin
+    linux: linux
+    windows: win32
+passenv = 
+    CI
+    GITHUB_ACTIONS
+    DISPLAY XAUTHORITY
+    NUMPY_EXPERIMENTAL_ARRAY_FUNCTION
+    PYVISTA_OFF_SCREEN
+extras = gui,distributed
+deps = 
+    .[gui,distributed]
+    pytest  # https://docs.pytest.org/en/latest/contents.html
+    pytest-cov  # https://pytest-cov.readthedocs.io/en/latest/
+    pytest-xvfb ; sys_platform == 'linux'
+commands = pytest -v --color=yes --cov=cellpose --cov-report=xml