diff --git a/off_by_3_fix/tests/data/sample_trace.json b/off_by_3_fix/tests/data/sample_trace.json
new file mode 100644
index 0000000..7d6b620
--- /dev/null
+++ b/off_by_3_fix/tests/data/sample_trace.json
@@ -0,0 +1,22 @@
+[
+  {
+    "group": "A",
+    "bucket": 96,
+    "value": 123.4
+  },
+  {
+    "group": "A",
+    "bucket": 199,
+    "value": 130.7
+  },
+  {
+    "group": "B",
+    "bucket": 303,
+    "value": 99.9
+  },
+  {
+    "group": "B",
+    "bucket": 406,
+    "value": 105.2
+  }
+]
\ No newline at end of file