Switch to poetry-based workflow (#6)

Author: fabaff

.github/workflows/testing.yml

@@ -1,35 +1,50 @@
-# This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
-
-name: Python application
+name: Testing
 
 on:
   push:
-    branches: [ main ]
+    branches: [ master ]
   pull_request:
-    branches: [ main ]
+    branches: [ master ]
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ 3.8, 3.9 ]
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.9
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
-        python-version: 3.9
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install Poetry
+      uses: snok/install-poetry@v1
+      with:
+        virtualenvs-create: true
+        virtualenvs-in-project: true
+        installer-parallel: true
+
+    - name: Load cached venv
+      id: cached-poetry-dependencies
+      uses: actions/cache@v2
+      with:
+        path: .venv
+        key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}
+
     - name: Install dependencies
+      if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+      run: poetry install --no-interaction --no-root
+
+    - name: Install library
+      run: poetry install --no-interaction
+
+    - name: Run tests
       run: |
-        python -m pip install --upgrade pip
-        pip install flake8 pytest pytest-asyncio pytest-httpx yarl httpx
-    - name: Lint with flake8
-      run: |
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest
-      run: |
-        pytest
+        source .venv/bin/activate
+        pytest tests/