fix tests

Author: rcholic

tests/test_screenshot_storage.py

@@ -117,8 +117,9 @@ def test_store_screenshot_handles_jpeg_format(self):
         upload_url = "https://sentience.nyc3.digitaloceanspaces.com/user123/run456/trace.jsonl.gz"
         run_id = "test-screenshot-storage-4"
 
-        # Minimal JPEG in base64 (1x1 JPEG)
-        test_jpeg_base64 = "/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCAABAAEDASIAAhEBAxEB/8QAFQABAQAAAAAAAAAAAAAAAAAAAAv/xAAUEAEAAAAAAAAAAAAAAAAAAAAA/8QAFQEBAQAAAAAAAAAAAAAAAAAAAAX/xAAUEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwA/wA="
+        # Minimal valid JPEG in base64 (1x1 pixel JPEG)
+        # This is a valid minimal JPEG file encoded in base64
+        test_jpeg_base64 = "/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIjLhwcKDcpLDAxNDQ0Hyc5PTgyPC7/wAALCAABAAEBAREA/8QAFAABAAAAAAAAAAAAAAAAAAAACP/EABQQAQAAAAAAAAAAAAAAAAAAAP/aAAgBAQAAPwCq/9k="
         test_data_url = f"data:image/jpeg;base64,{test_jpeg_base64}"
 
         sink = CloudTraceSink(upload_url, run_id=run_id)