Test db ppopulate (#19)

Reviewed-on: #19
Co-authored-by: Mathias <mathias2784@web.de>

tests/test_smoke_b4w.py

@@ -0,0 +1,23 @@
+from datetime import date
+
+import faker
+
+from src.models.b4w import B4wDb
+
+
+def test_b4w_populate(populated_db_b4w):
+    val_dt_min, val_dt_max = date(2026, 1, 1), date(2026, 3, 31)
+    session = populated_db_b4w(
+        "b4w_basic",
+        100,
+        ValDt=lambda: faker.Faker().date_between(val_dt_min, val_dt_max),
+    )
+    assert session
+    assert session.query(B4wDb).count() == 100
+    # ``ValDt`` was given as a per-row callable: it must have been resolved
+    # and persisted for every row.
+    dates = [d for (d,) in session.query(B4wDb.date_valid).all()]
+    assert all(val_dt_min <= d <= val_dt_max for d in dates)
+    # ``Id1`` is assigned per row: one distinct row per id, no dedup collisions.
+    ids = [i for (i,) in session.query(B4wDb.id_b4w).order_by(B4wDb.id_b4w).all()]
+    assert ids == list(range(1, 101))