Проверка на данном этапе

tests/test_generate_data.py

@@ -0,0 +1,20 @@
+import csv
+
+from src.generate_data import generate_data
+
+
+def test_record_count_and_header(tmp_path):
+    path = tmp_path / "orders.csv"
+    generate_data(path)
+    with path.open(encoding="utf-8", newline="") as source:
+        records = csv.reader(source)
+        assert next(records) == ["order_id", "order_date", "category", "quantity", "unit_price"]
+        assert sum(1 for _ in records) == 1500
+
+
+def test_repeated_generation_is_byte_identical(tmp_path):
+    path = tmp_path / "orders.csv"
+    generate_data(path)
+    first_run = path.read_bytes()
+    generate_data(path)
+    assert path.read_bytes() == first_run