fix: exclude demo companies from state corp exchange

tests/apps/exchange/test_state_corp_services.py

@@ -23,6 +23,7 @@ from apps.parsers.models import (
 from cryptography.hazmat.primitives.ciphers.aead import AESGCM
 from django.test import TestCase, override_settings
 from organizations.models import Organization
+from organizations.test_companies import TestCompanyDatasetService
 
 from tests.apps.parsers.factories import (
     IndustrialCertificateRecordFactory,
@@ -67,6 +68,30 @@ TEST_STATE_CORP_TOKEN = "state-corp-test-exchange-token"  # noqa: S105
 class StateCorpExchangeServiceTest(TestCase):
     """Verify package compatibility with state-corp receiver contract."""
 
+    def test_default_package_excludes_deterministic_test_companies(self):
+        real_organization = Organization.objects.create(
+            rn=1001,
+            name="Реальная организация",
+            inn="7707083893",
+            gk_name="Росатом",
+        )
+        Organization.objects.create(
+            uid=TestCompanyDatasetService.company_uids()[0],
+            rn=9001,
+            name="Тестовая компания 1",
+            inn="7700000001",
+            gk_name="Росатом",
+        )
+
+        package = StateCorpExchangeService.build_package()
+        payload = _decode_package_payload(package)
+
+        self.assertEqual(package.payload_counts["organizations"], 1)
+        self.assertEqual(
+            [row["mostovik_uid"] for row in payload["data"]["organizations"]],
+            [str(real_organization.uid)],
+        )
+
     def test_build_package_contains_expected_payload(self):
         organization = Organization.objects.create(
             rn=1001,