diff --git a/exit_metrics_logging/tests/data/sample_metrics.json b/exit_metrics_logging/tests/data/sample_metrics.json
new file mode 100644
index 0000000..0f491b4
--- /dev/null
+++ b/exit_metrics_logging/tests/data/sample_metrics.json
@@ -0,0 +1,26 @@
+[
+  {
+    "run_id": "pinned_run_001",
+    "warn_rate": 0.012,
+    "unknown_rate": 0.004,
+    "delta_t": 0.298
+  },
+  {
+    "run_id": "pinned_run_002",
+    "warn_rate": 0.010,
+    "unknown_rate": 0.002,
+    "delta_t": 0.301
+  },
+  {
+    "run_id": "unpinned_run_001",
+    "warn_rate": 0.018,
+    "unknown_rate": 0.009,
+    "delta_t": 0.325
+  },
+  {
+    "run_id": "unpinned_run_002",
+    "warn_rate": 0.020,
+    "unknown_rate": 0.007,
+    "delta_t": 0.330
+  }
+]
\ No newline at end of file