name: pytest

on:
  pull_request:
    paths:  # This action will only run if the PR modifies a file in one of these directories
    - 'ml-agents/**'
    - 'ml-agents-envs/**'
    - 'gym-unity/**'
    - 'test_constraints*.txt'
    - 'test_requirements.txt'
    - '.github/workflows/pytest.yml'
  push:
    branches: [master]

jobs:
  pytest:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [3.6.x, 3.7.x, 3.8.x]
        include:
          - python-version: 3.6.x
            pip_constraints: test_constraints_min_version.txt
          - python-version: 3.7.x
            pip_constraints: test_constraints_max_tf1_version.txt
          - python-version: 3.8.x
            pip_constraints: test_constraints_max_tf2_version.txt
    steps:
    - uses: actions/checkout@v2
    - name: Set up Python
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
    - name: Cache pip
      uses: actions/cache@v2
      with:
        # This path is specific to Ubuntu
        path: ~/.cache/pip
        # Look to see if there is a cache hit for the corresponding requirements file
        key: ${{ runner.os }}-pip-${{ hashFiles('ml-agents/setup.py', 'ml-agents-envs/setup.py', 'gym-unity/setup.py', 'test_requirements.txt', matrix.pip_constraints) }}
        restore-keys: |
          ${{ runner.os }}-pip-
          ${{ runner.os }}-
    - name: Display Python version
      run: python -c "import sys; print(sys.version)"
    - name: Install dependencies
      run: |
        # pin pip to workaround https://github.com/pypa/pip/issues/9180
        python -m pip install pip==20.2
        python -m pip install --upgrade setuptools
        python -m pip install --progress-bar=off -e ./ml-agents-envs -c ${{ matrix.pip_constraints }}
        python -m pip install --progress-bar=off -e ./ml-agents -c ${{ matrix.pip_constraints }}
        python -m pip install --progress-bar=off -r test_requirements.txt -c ${{ matrix.pip_constraints }}
        python -m pip install --progress-bar=off -e ./gym-unity -c ${{ matrix.pip_constraints }}
    - name: Save python dependencies
      run: |
        pip freeze > pip_versions-${{ matrix.python-version }}.txt
        cat pip_versions-${{ matrix.python-version }}.txt
    - name: Run pytest
      run: pytest --cov=ml-agents --cov=ml-agents-envs --cov=gym-unity --cov-report html --junitxml=junit/test-results-${{ matrix.python-version }}.xml -p no:warnings
    - name: Upload pytest test results
      uses: actions/upload-artifact@v2
      with:
        name: artifacts-${{ matrix.python-version }}
        path: |
          htmlcov
          pip_versions-${{ matrix.python-version }}.txt
          junit/test-results-${{ matrix.python-version }}.xml
      # Use always() to always run this step to publish test results when there are test failures
      if: ${{ always() }}