update github workflow

.github/workflows/lint_and_test.yml

@@ -2,26 +2,40 @@ name: Lint and test
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, poetry ]
   pull_request:
     branches: [ master ]
 
 jobs:
-  build:
-
+  test:
+    name: Test on ${{ matrix.python_version }}
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python_version: ["3.7", "3.8", "3.9"]
+      fail-fast: false
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.9
+    - name: Set up Python ${{ matrix.python_version }}
       uses: actions/setup-python@v2
       with:
-        python-version: 3.9
-    - name: Install dependencies
+        python-version: ${{ matrix.python_version }}
+    - uses: actions/cache@v2
+      id: cache
+      with:
+        path: ${{ env.pythonLocation }}
+        key: ${{ runner.os }}-python-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml') }}-root
+    - name: Install poetry
+      if: steps.cache.outputs.cache-hit != 'true'
       run: |
         python -m pip install --upgrade pip
-        pip install black pytest
-        pip install .
+        python -m pip install "poetry==1.2.0a2"
+    - name: Configure poetry
+      run: python -m poetry config virtualenvs.create false
+    - name: Install Dependencies
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: python -m poetry install
     - name: Lint with black
       run: |
         # stop the build if there are Python syntax errors or undefined names