name: Unit Testing

on:
  workflow_call:
    inputs:
      python_versions:
        description: 'Space separated list of Python versions to run tests with.'
        required: false
        default: '3.6 3.7 3.8 3.9 3.10'
        type: string
      requirements:
        description: 'Python dependencies to be installed through pip.'
        required: false
        default: '-r tests/requirements.txt'
        type: string
      TestReport:
        description: "Generate unit test report with junitxml and upload results as an artifact."
        required: false
        default: false
        type: string

jobs:


  Versions:
    runs-on: ubuntu-latest
    outputs:
      jobs: ${{ steps.versions.outputs.jobs }}
    steps:

      - id: versions
        shell: python
        run: |
          icons = {
             '3.6': '🔴', # until 23.12.2021
             '3.7': '🟠', # until 27.06.2023
             '3.8': '🟡', # until Oct. 2024
             '3.9': '🟢', # until Oct. 2025
            '3.10': '🟢', # until Oct. 2026
          }
          jobs = [
              {'python': version, 'icon': icons[version]}
              for version in '${{ inputs.python_versions }}'.split(' ')
          ]
          print(f'::set-output name=jobs::{jobs!s}')


  UnitTesting:
    name: ${{ matrix.icon }} Unit Tests using Python ${{ matrix.python }}
    runs-on: ubuntu-latest
    needs:
      - Versions

    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJson(needs.Versions.outputs.jobs) }}

    steps:
      - name: ⏬ Checkout repository
        uses: actions/checkout@v2

      - name: 🐍 Setup Python ${{ matrix.python }}
        uses: actions/setup-python@v2
        with:
          python-version: ${{ matrix.python }}

      - name: 🔧 Install dependencies
        run: |
          python -m pip install -U pip
          python -m pip install ${{ inputs.requirements }}

      - name: ☑ Run unit tests
        run: |
          [ '${{ inputs.TestReport }}' = 'true' ] && PYTEST_ARGS='--junitxml=TestReport.xml' || unset PYTEST_ARGS
          python -m pytest -rA tests/unit $PYTEST_ARGS --color=yes

      - name: 📤 Upload 'TestReport.xml' artifact
        if: inputs.TestReport == 'true'
        uses: actions/upload-artifact@v2
        with:
          name: TestReport-${{ matrix.python }}
          path: TestReport.xml
          if-no-files-found: error
          retention-days: 1