feat: add demo report import workflow

tests/apps/exchange/test_api.py

@@ -371,6 +371,7 @@ class ExchangePackageApiTest(APITestCase):
 
     def setUp(self):
         self.url = reverse("api_v1:exchange:package-upload")
+        self.latest_url = reverse("api_v1:exchange:package-latest")
         password = get_random_string(16)
         self.user = User.objects.create_user(
             username="exchange-admin",
@@ -378,6 +379,55 @@ class ExchangePackageApiTest(APITestCase):
             password=password,
         )
 
+    def test_latest_requires_authentication(self):
+        response = self.client.get(self.latest_url)
+
+        self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
+
+    def test_latest_returns_null_when_no_packages_exist(self):
+        self.client.force_authenticate(self.user)
+
+        response = self.client.get(self.latest_url)
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(
+            response.data,
+            {"success": True, "data": None, "errors": None, "meta": None},
+        )
+
+    def test_latest_returns_newest_package_metadata(self):
+        older = ExchangePackageImport.objects.create(
+            package_id="older-package",
+            package_name="older.zip",
+            package_hash="a" * 64,
+            source_system="mostovik",
+            schema_version=1,
+            delivery_channel=ExchangeDeliveryChannel.API,
+            status="failed",
+        )
+        latest = ExchangePackageImport.objects.create(
+            package_id="latest-package",
+            package_name="latest.zip",
+            package_hash="b" * 64,
+            source_system="mostovik",
+            schema_version=1,
+            delivery_channel=ExchangeDeliveryChannel.API,
+            status="success",
+        )
+        ExchangePackageImport.objects.filter(pk=older.pk).update(
+            created_at=older.created_at.replace(year=older.created_at.year - 1)
+        )
+        self.client.force_authenticate(self.user)
+
+        response = self.client.get(self.latest_url)
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data["data"]["id"], str(latest.id))
+        self.assertEqual(response.data["data"]["package_id"], "latest-package")
+        self.assertEqual(response.data["data"]["package_name"], "latest.zip")
+        self.assertEqual(response.data["data"]["status"], "success")
+        self.assertIn("created_at", response.data["data"])
+
     def test_upload_imports_package_and_upserts_models(self):
         Organization.objects.create(
             inn="7707083893",