diff --git a/trace_aggpy/tests/data/sample_reads.json b/trace_aggpy/tests/data/sample_reads.json
new file mode 100644
index 0000000..0799ffc
--- /dev/null
+++ b/trace_aggpy/tests/data/sample_reads.json
@@ -0,0 +1,58 @@
+[
+  {
+    "corr_id": "run_001",
+    "timestamp": 0.001,
+    "cpu": 0,
+    "field_tag": "mult",
+    "retry_free": true
+  },
+  {
+    "corr_id": "run_001",
+    "timestamp": 0.0035,
+    "cpu": 1,
+    "field_tag": "shift",
+    "retry_free": false
+  },
+  {
+    "corr_id": "run_001",
+    "timestamp": 0.0041,
+    "cpu": 1,
+    "field_tag": "nsec_base",
+    "retry_free": true
+  },
+  {
+    "corr_id": "run_002",
+    "timestamp": 0.0008,
+    "cpu": 2,
+    "field_tag": "mult",
+    "retry_free": true
+  },
+  {
+    "corr_id": "run_002",
+    "timestamp": 0.0020,
+    "cpu": 3,
+    "field_tag": "shift",
+    "retry_free": true
+  },
+  {
+    "corr_id": "run_002",
+    "timestamp": 0.0029,
+    "cpu": 3,
+    "field_tag": "nsec_base",
+    "retry_free": false
+  },
+  {
+    "corr_id": "run_edge",
+    "timestamp": 0.0,
+    "cpu": 0,
+    "field_tag": "mult",
+    "retry_free": false
+  },
+  {
+    "corr_id": "run_edge",
+    "timestamp": 10.0,
+    "cpu": 0,
+    "field_tag": "shift",
+    "retry_free": true
+  }
+]
\ No newline at end of file