test: Add verification for $schema property in settings schema (#13497)

scripts/tests/generate-settings-schema.test.ts

@@ -5,6 +5,9 @@
  */
 
 import { describe, expect, it } from 'vitest';
+import { readFile } from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
 import { main as generateSchema } from '../generate-settings-schema.ts';
 
 describe('generate-settings-schema', () => {
@@ -13,4 +16,22 @@ describe('generate-settings-schema', () => {
     await expect(generateSchema(['--check'])).resolves.toBeUndefined();
     expect(process.exitCode).toBe(previousExitCode);
   });
+
+  it('includes $schema property in generated schema', async () => {
+    const __dirname = dirname(fileURLToPath(import.meta.url));
+    const schemaPath = join(__dirname, '../../schemas/settings.schema.json');
+    const schemaContent = await readFile(schemaPath, 'utf-8');
+    const schema = JSON.parse(schemaContent);
+
+    // Verify $schema property exists in the schema's properties
+    expect(schema.properties).toHaveProperty('$schema');
+    expect(schema.properties.$schema).toEqual({
+      type: 'string',
+      title: 'Schema',
+      description:
+        'The URL of the JSON schema for this settings file. Used by editors for validation and autocompletion.',
+      default:
+        'https://raw.githubusercontent.com/google-gemini/gemini-cli/main/schemas/settings.schema.json',
+    });
+  });
 });