diff --git a/retry_mechanism_analysis/tests/data/sample_run.json b/retry_mechanism_analysis/tests/data/sample_run.json
new file mode 100644
index 0000000..958227e
--- /dev/null
+++ b/retry_mechanism_analysis/tests/data/sample_run.json
@@ -0,0 +1,37 @@
+{
+  "runs": [
+    {
+      "run_id": 18,
+      "parallelism_level": 2,
+      "stratum": "A",
+      "entries": [
+        {"latency_ms": 120.4, "retry_count": 1},
+        {"latency_ms": 130.1, "retry_count": 0},
+        {"latency_ms": 115.7, "retry_count": 2},
+        {"latency_ms": 141.0, "retry_count": 1}
+      ]
+    },
+    {
+      "run_id": 19,
+      "parallelism_level": 4,
+      "stratum": "A",
+      "entries": [
+        {"latency_ms": 150.2, "retry_count": 2},
+        {"latency_ms": 149.5, "retry_count": 3},
+        {"latency_ms": 167.8, "retry_count": 1},
+        {"latency_ms": 160.0, "retry_count": 2}
+      ]
+    },
+    {
+      "run_id": 20,
+      "parallelism_level": 4,
+      "stratum": "B",
+      "entries": [
+        {"latency_ms": 210.7, "retry_count": 4},
+        {"latency_ms": 195.3, "retry_count": 3},
+        {"latency_ms": 205.9, "retry_count": 2},
+        {"latency_ms": 198.5, "retry_count": 3}
+      ]
+    }
+  ]
+}
\ No newline at end of file