Add structured logging module for verification events (#28)

backend/tests/test_download_verification.py

@@ -12,6 +12,7 @@ These tests verify:
 import pytest
 import hashlib
 import base64
+import io
 
 
 # =============================================================================
@@ -20,11 +21,31 @@ import base64
 
 
 @pytest.fixture
-def test_content():
-    """Generate test content with known hash."""
-    content = b"Test content for download verification"
-    sha256 = hashlib.sha256(content).hexdigest()
-    return content, sha256
+def upload_test_file(integration_client):
+    """
+    Factory fixture to upload a test file and return its artifact ID.
+
+    Usage:
+        artifact_id = upload_test_file(project, package, content, tag="v1.0")
+    """
+
+    def _upload(project_name: str, package_name: str, content: bytes, tag: str = None):
+        files = {
+            "file": ("test-file.bin", io.BytesIO(content), "application/octet-stream")
+        }
+        data = {}
+        if tag:
+            data["tag"] = tag
+
+        response = integration_client.post(
+            f"/api/v1/project/{project_name}/{package_name}/upload",
+            files=files,
+            data=data,
+        )
+        assert response.status_code == 200, f"Upload failed: {response.text}"
+        return response.json()["artifact_id"]
+
+    return _upload
 
 
 # =============================================================================