add unit test and workflow

.github/workflows/test.yaml

@@ -0,0 +1,20 @@
+name: Run Unit Tests
+on: [push, workflow_dispatch]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Update Python
+        uses: actions/setup-python@v3
+        with:
+          python-version: '3.12'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+      - name: Run tests
+        run: |
+          source venv/bin/activate
+          pytest test/create_layer_unit_test.py

test/create_layer_unit_test.py

@@ -0,0 +1,16 @@
+import pytest
+from create_layer import _get_platform, _format_size
+
+def test_get_platform():
+    assert _get_platform("arm64") == "manylinux2014_aarch64"
+    assert _get_platform("x86_64") == "manylinux2014_x86_64"
+    with pytest.raises(ValueError, match="Unknown architecture: unknown"):
+        _get_platform("unknown")
+
+def test_format_size():
+    assert _format_size(500) == "500.00 B"
+    assert _format_size(1024) == "1.00 KiB"
+    assert _format_size(1048576) == "1.00 MiB"
+    assert _format_size(1073741824) == "1.00 GiB"
+    assert _format_size(1099511627776) == "1.00 TiB"
+    assert _format_size(1125899906842624) == "1.00 PiB"