Unit tests (#23)

* Added unit tests and linting tools for development

* Added pre-commit config file

* Added lint github action

* Add tests and coverage comments to PRs

* Set coverage options

* Fixed yaml

* Fixed permissions

* Omit tests in coverage report

* Run linting only on PRs

.github/workflows/lint.yml

@@ -0,0 +1,57 @@
+name: Run Unit Test via Pytest
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  lint-and-test:
+    runs-on: ubuntu-latest
+    permissions:
+        pull-requests: write
+        contents: write
+        checks: write
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Setup PDM
+        uses: pdm-project/setup-pdm@v3
+      - name: Install dependencies
+        run: pdm install
+      - name: Lint with black
+        uses: psf/black@stable
+        with:
+          options: "--check --verbose"
+      - name: Test with pytest
+        run: |
+          pdm run pytest --junit-xml=test-results.xml
+      - name: Publish Test Results
+        uses: EnricoMi/publish-unit-test-result-action@v2
+        if: always()
+        with:
+          files: |
+            test-results.xml
+      - name: Test with coverage
+        run: |
+          pdm run coverage run -m pytest -v -s
+      - name: Generate Coverage Report
+        run: |
+          pdm run coverage report -m
+      - name: Coverage comment
+        id: coverage_comment
+        uses: py-cov-action/python-coverage-comment-action@v3
+        with:
+          GITHUB_TOKEN: ${{ github.token }}
+      - name: Store Pull Request comment to be posted
+        uses: actions/upload-artifact@v3
+        if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
+        with:
+          name: python-coverage-comment-action
+          path: python-coverage-comment-action.txt