os-matrix.yml

on: 
  push:
    tags:
    - "*.*.*"
  workflow_dispatch:

jobs:
  pytest:
    runs-on: ${{ matrix.os }}
    strategy:
      max-parallel: 3
      fail-fast: true
      matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ['3.7', '3.8', '3.9']

    steps:
    - uses: actions/checkout@v2
    - name: Set up Python
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
      
    - name: Check Black code style
      uses: psf/black@stable #https://black.readthedocs.io/en/stable/integrations/github_actions.html
    
    - name: Upgrade pip, install dependencies
      shell: bash {0}
      run: |
        pip install --upgrade pip
        pip install flit torch
        flit install
    - name: Test with Pytest on MacOS or Ubuntu
      shell: bash {0}
      if: startsWith(matrix.os, 'macos') || startsWith(matrix.os, 'ubuntu')
      run: |
        python -m pytest
    - name: Test with Pytest on Windows
      shell: bash {0}
      if: startsWith(matrix.os, 'windows')
      run: |
        python -m pytest

# NOTES:
# needed to use python instead of python3 for Windows https://stackoverflow.com/questions/61558780/python-testing-with-github-actions-on-windows
# also needed to remove the -l from the shell so it didn't interfere with MacOS PATH calling Python 2.7