Enable tox tests and github actions around it

.github/workflows/tox.yml

@@ -0,0 +1,49 @@
+name: run tox
+
+# Controls when the action will run. Workflow runs when manually triggered using the UI
+# or API.
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'master'
+      - 'tox-test'
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.8", "3.9"]
+        testsuite: ["minimal"] # "full"
+    steps:
+      - uses: actions/checkout@master
+      - name: set up python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+      - name: install system dependencies (linux)
+        if: runner.os == 'Linux'
+        # only managed to install system dependencies on Linux runners
+        run: |
+          sudo apt update
+          sudo apt install libgmp-dev libmpfr-dev libmpc-dev
+      - name: install python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install tox
+      - name: run tox (linux)
+        # since system dependencies could only be installed on Linux runners, we run the "full" suite only on Linux ...
+        if: runner.os == 'Linux'
+        run: tox -e py-${{ matrix.testsuite }} -- --hypothesis-profile=ci
+      - name: run tox (macos or windows - minimal)
+        if: runner.os != 'Linux' && matrix.testsuite == 'minimal'
+        run: tox -e py-minimal -- --hypothesis-profile=ci
+      - name: run tox (macos or windows - recommendedextra)
+        # ... on all other OS we run the "recommendedextra" suite instead of the "full" suite
+        if: runner.os != 'Linux' && matrix.testsuite == 'full'
+        run: tox -e py-recommendedextra -- --hypothesis-profile=ci

.gitignore

@@ -23,3 +23,5 @@ docs/source/_examples
 .DS_Store
 
 .vscode/
+
+*.tox

tox.ini

@@ -0,0 +1,9 @@
+[tox]
+envlist = py38,py39,py-minimal
+
+[testenv]
+# install pytest in the virtualenv where commands will be executed
+deps = pytest
+commands =
+    # NOTE: you can run any command line tool here - not just tests
+    pytest