diff --git a/timestamp_logger/tests/data/sample_timestamps.jsonl b/timestamp_logger/tests/data/sample_timestamps.jsonl
new file mode 100644
index 0000000..3e0a2fd
--- /dev/null
+++ b/timestamp_logger/tests/data/sample_timestamps.jsonl
@@ -0,0 +1,3 @@
+{"t_publish": "2024-04-12T14:32:45", "t_gate_read": "2024-04-12T14:34:01", "t_index_visible": "2024-04-12T14:36:33"}
+{"t_publish": "2024-04-12T15:10:22", "t_gate_read": "2024-04-12T15:11:05", "t_index_visible": "2024-04-12T15:13:40"}
+{"t_publish": "2024-04-12T16:00:00", "t_gate_read": "2024-04-12T16:02:10", "t_index_visible": "2024-04-12T16:06:45"}
\ No newline at end of file