diff --git a/nifi/user-scripts/tests/generate_big_ann_file.py b/nifi/user-scripts/tests/generate_big_ann_file.py
new file mode 100644
index 00000000..b3dcf807
--- /dev/null
+++ b/nifi/user-scripts/tests/generate_big_ann_file.py
@@ -0,0 +1,23 @@
+import json
+
+f_path = "../../../data/cogstack-cohort/medical_reports_anns_medcat_medmen__*.json"
+
+
+def chunk(input_list: list, num_slices: int):
+    for i in range(0, len(input_list), num_slices):
+        yield input_list[i:i + num_slices]
+
+
+contents = None
+
+add_records = 400000
+
+first_annotation = contents[0]
+
+for i in range(add_records):
+    contents.append(first_annotation)
+
+export_path = "../../../data/medical_reports_anns_medcat_medmen__test_big.json"
+
+with open(export_path, mode="w+") as f:
+    f.write(json.dumps(contents))