diff --git a/data_analysis/tests/data/sample_run_data.json b/data_analysis/tests/data/sample_run_data.json
new file mode 100644
index 0000000..591fcd4
--- /dev/null
+++ b/data_analysis/tests/data/sample_run_data.json
@@ -0,0 +1,32 @@
+[
+  {
+    "epoch_ms": 1710000000000,
+    "run_id": "r001",
+    "retry_tail_p99": 12.3,
+    "band_width": 98.5
+  },
+  {
+    "epoch_ms": 1710000005000,
+    "run_id": "r001",
+    "retry_tail_p99": 11.9,
+    "band_width": 99.1
+  },
+  {
+    "epoch_ms": 1710000010000,
+    "run_id": "r002",
+    "retry_tail_p99": 13.1,
+    "band_width": 97.8
+  },
+  {
+    "epoch_ms": 1710000015000,
+    "run_id": "r002",
+    "retry_tail_p99": 13.0,
+    "band_width": 98.2
+  },
+  {
+    "epoch_ms": 1710000020000,
+    "run_id": "r003",
+    "retry_tail_p99": 12.7,
+    "band_width": 99.0
+  }
+]
\ No newline at end of file