some tests in test_helper_db.py

tests/test_helper_db.py

@@ -0,0 +1,34 @@
+#!/bin/python
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from src.helper_db import upsert_category
+from src.models import Category
+from src.models_db import CategoryDb
+
+
+def test_upsert_category_returns_orm_object(db_session: Session):
+    result = upsert_category(db_session, Category.from_str("dummy_parent_1:dummy_parent_2:dummy"), do_commit=False)
+    assert result
+    assert isinstance(result, CategoryDb)
+    assert str(result.name) == "dummy"
+    assert str(result.parent.name) == "dummy_parent_2"
+    assert str(result.parent.parent.name) == "dummy_parent_1"
+
+def test_upsert_category_writes_new_to_db(db_session: Session):
+    upsert_category(db_session, Category.from_str("grand_father:father:new_category"), do_commit=True)
+    result = db_session.execute(select(CategoryDb).filter_by(name="new_category")).scalar_one()
+    assert result
+    assert str( result.name ) == "new_category"
+    assert str( result.parent.name ) == "father"
+    assert str( result.parent.parent.name ) == "grand_father"
+
+def test_upsert_category_skips_existing(db_session: Session):
+    for _ in range(3):
+        upsert_category(db_session, Category.from_str("grand_father:father:try_again_and_again"), do_commit=True)
+    result = db_session.execute(select(CategoryDb).filter_by(name="try_again_and_again")).all()
+    assert len(result) == 1
+
+    
+