Test for expected failure when input file is not valid JSON

tests/e2e_notebooks/test_invalid_json.ipynb

@@ -0,0 +1,33 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "5c42035d",
+   "metadata": {},
+   "source": [
+    "This notebook is not valid JSON."
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5,
+}

tests/test_end_to_end.py

@@ -43,7 +43,8 @@
 
 ERR_OUTPUT_CASES = [
     ("test_metadata.ipynb", ["Ignoring invalid extra key `invalid`", "Ignoring invalid extra key `foo.invalid`"], ["--extra-keys", "invalid foo.invalid"]),
-    ("test_metadata_exception.ipynb", [re.compile(".*MetadataError: cell metadata contradicts tags: `keep_output` is false, but `keep_output` in tags")], [])
+    ("test_metadata_exception.ipynb", [re.compile(".*MetadataError: cell metadata contradicts tags: `keep_output` is false, but `keep_output` in tags")], []),
+    ("test_invalid_json.ipynb", ["No valid notebook detected on stdin"], []),
 ]