diff --git a/measure_latency/tests/data/sample_latency_results.json b/measure_latency/tests/data/sample_latency_results.json
new file mode 100644
index 0000000..d34729e
--- /dev/null
+++ b/measure_latency/tests/data/sample_latency_results.json
@@ -0,0 +1,42 @@
+[
+  {
+    "upload_end_time": "2024-06-01T12:00:00.000Z",
+    "api_response_time": "2024-06-01T12:00:00.150Z",
+    "fs_mtime": "2024-06-01T12:00:00.180Z",
+    "offsets": {
+      "api_minus_upload": 150,
+      "fs_minus_api": 30,
+      "total_span": 180
+    }
+  },
+  {
+    "upload_end_time": "2024-06-01T12:01:10.000Z",
+    "api_response_time": "2024-06-01T12:01:10.120Z",
+    "fs_mtime": "2024-06-01T12:01:10.145Z",
+    "offsets": {
+      "api_minus_upload": 120,
+      "fs_minus_api": 25,
+      "total_span": 145
+    }
+  },
+  {
+    "upload_end_time": "2024-06-01T12:02:25.000Z",
+    "api_response_time": "2024-06-01T12:02:25.300Z",
+    "fs_mtime": "2024-06-01T12:02:25.340Z",
+    "offsets": {
+      "api_minus_upload": 300,
+      "fs_minus_api": 40,
+      "total_span": 340
+    }
+  },
+  {
+    "upload_end_time": "2024-06-01T12:03:50.000Z",
+    "api_response_time": "2024-06-01T12:03:50.220Z",
+    "fs_mtime": "2024-06-01T12:03:50.250Z",
+    "offsets": {
+      "api_minus_upload": 220,
+      "fs_minus_api": 30,
+      "total_span": 250
+    }
+  }
+]
\ No newline at end of file