Update CI workflow.

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
     branches:
       - "main"
 
+env:
+  PYTHON_VERSION: 3.11
+
 jobs:
   test:
     name: Run tests & display coverage
@@ -20,11 +23,26 @@ jobs:
       contents: write
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
 
-      - name: Install everything, run the tests, produce the .coverage file
+      - name: Install Poetry
         run: |
-          run coverage run -m pytest
-          run coverage xml
+          pipx install poetry
+          poetry config virtualenvs.path ~/.virtualenvs${{ env.PYTHON_VERSION }}
+
+      - name: Set up Python ${{ env.PYTHON_VERSION }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          cache: "poetry"
+
+      - name: Install dependencies
+        run: |
+          poetry install -E minify
+
+      - name: Produce the .coverage file
+        run: poetry run coverage run -m pytest
 
       - name: Coverage comment
         id: coverage_comment

pyproject.toml

@@ -174,6 +174,10 @@ disable_error_code = ["empty-body"]
 module = "decorator"
 ignore_missing_imports = true
 
+[tool.coverage.run]
+branch = true
+relative_files = true
+
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"