test: use valid FNS upload workbooks

tests/test_api_inventory_e2e.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import io
-from datetime import date, timedelta
+from datetime import timedelta
 from pathlib import Path
 from tempfile import TemporaryDirectory
 from types import SimpleNamespace
@@ -45,10 +45,10 @@ def _build_fns_excel_bytes() -> bytes:
     workbook = Workbook()
     worksheet = workbook.active
     year = fake.random_int(min=2020, max=2025)
-    worksheet.append(["Form", None, year, None])
-    worksheet.append([None, "Code", "Start", "End"])
+    worksheet.append(["Форма №1", None, year, None])
+    worksheet.append([None, "Код", "Начало", "Конец"])
     worksheet.append(
-        [fake.word(), _digits(4), fake.random_int(10, 999), fake.random_int(10, 999)]
+        ["Баланс", "1600", fake.random_int(10, 999), fake.random_int(10, 999)]
     )
     buffer = io.BytesIO()
     workbook.save(buffer)
@@ -634,7 +634,9 @@ class ExchangeApiInventoryE2ETest(AuthenticatedApiMixin, APITestCase):
             )
 
         self.assertEqual(copy_response.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
-        self.assertEqual(tables_response.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
+        self.assertEqual(
+            tables_response.status_code, status.HTTP_405_METHOD_NOT_ALLOWED
+        )
         self.assertEqual(
             detail_periodic.status_code,
             status.HTTP_405_METHOD_NOT_ALLOWED,