test: json config file non readable

Author: marco-ippolito

test/fixtures/rc/non-readable/node.json

@@ -0,0 +1,3 @@
+{
+  "max-http-header-size": 10
+}

test/parallel/test-config-file.js

@@ -4,6 +4,7 @@ const { spawnPromisified } = require('../common');
 const fixtures = require('../common/fixtures');
 const { match, strictEqual } = require('node:assert');
 const { test } = require('node:test');
+const { chmodSync } = require('node:fs');
 
 test('should handle non existing json', async () => {
   const result = await spawnPromisified(process.execPath, [
@@ -282,3 +283,17 @@ test('should override node.json when specificied', async () => {
   strictEqual(result.stdout, '20\n');
   strictEqual(result.code, 0);
 });
+
+test('should throw an error when the file is non readable', async () => {
+  chmodSync(fixtures.path('rc/non-readable/node.json'), '000');
+  const result = await spawnPromisified(process.execPath, [
+    '--no-warnings',
+    '--experimental-config-file',
+    '-p', 'http.maxHeaderSize',
+  ], {
+    cwd: fixtures.path('rc/non-readable'),
+  });
+  match(result.stderr, /Cannot read configuration from node\.json: permission denied/);
+  strictEqual(result.stdout, '');
+  strictEqual(result.code, 9);
+});