Add tests for lsblk thing and add workflow

.github/workflows/tests.yml

@@ -0,0 +1,27 @@
+name: Python Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install pytest
+
+      - name: Run tests
+        run: pytest tests

basilico.py

@@ -599,7 +599,11 @@ def _get_last_linux_partition_path_and_number(dev: str) -> tuple[str, str] | tup
         # PARTTYPENAME could be useful, too
         output = subprocess.getoutput(f"lsblk -o PATH,PARTN,PARTTYPE -J {dev}")
         jsonized = json.loads(output)
-        for i, entry in enumerate(jsonized["blockdevices"]):
+        return CommandRunner._get_last_linux_partition_path_and_number_from_lsblk(jsonized)
+
+    @staticmethod
+    def _get_last_linux_partition_path_and_number_from_lsblk(lsblk_json: dict) -> tuple[str, str] | tuple[None, None]:
+        for i, entry in enumerate(lsblk_json["blockdevices"]):
             if entry["path"]:  # lsblk also returns the device itself, which has no partitions
                 # GPT or MBR Linux partition ID
                 if entry["parttype"] == "0fc63daf-8483-4772-8e79-3d69d8477de4" or entry["parttype"] == "0x83":