add importability test

.github/workflows/test.yml

@@ -10,6 +10,27 @@ on:
       - "pyproject.toml"
 
 jobs:
+  importable:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -el {0}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup environment
+        uses: ./.github/actions/setup-env
+        with:
+          optional-dependencies: "false"
+
+      - name: Check if all public packages are importable
+        run: python tests/test_importable.py
+
+
   unit:
     runs-on: ubuntu-latest
     defaults:

tests/test_importable.py

@@ -0,0 +1,32 @@
+import importlib
+from pathlib import Path
+
+HERE = Path(__file__).parent
+PROJECT_ROOT = HERE.parent
+PACKAGE_ROOT = PROJECT_ROOT / "ragna"
+
+
+def main():
+    for path in PACKAGE_ROOT.rglob("*.py"):
+        if path.name == "__init__.py":
+            path = path.parent
+        else:
+            path = path.with_suffix("")
+
+        if path.name.startswith("_"):
+            continue
+
+        name = path.relative_to(PROJECT_ROOT).as_posix().replace("/", ".")
+
+        try:
+            importlib.import_module(name)
+        except Exception as exc:
+            raise ImportError(
+                f"Trying to import '{name}' raise the error above"
+            ) from exc
+        else:
+            print(name)
+
+
+if __name__ == "__main__":
+    main()