test/first (#8)

Introducing first very simple tests for tools.py

Reviewed-on: https://www.kuhl-mann.de/git/git/jkuhl/corrlib/pulls/8

.github/workflows/pytest.yaml

@@ -0,0 +1,35 @@
+name: Pytest
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 4 1 * *'
+
+jobs:
+  pytest:
+    strategy:
+      matrix:
+        python-version:
+          - "3.12"
+          - "3.13"
+          - "3.14"
+
+    runs-on: ubuntu-latest
+    env:
+      UV_CACHE_DIR: /tmp/.uv-cache
+    steps:
+      - name: Check out the repository
+        uses: https://github.com/RouxAntoine/checkout@v4.1.8
+        with:
+          show-progress: true
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          python-version: ${{ matrix.python-version }}
+          enable-cache: true
+      - name: Install corrlib
+        run: uv sync --locked --all-extras --dev --python ${{ matrix.python-version }}
+      - name: Run tests
+        run: uv run pytest tests