[extensions] Add extensions uninstall command (#6877)

packages/cli/src/commands/extensions/uninstall.test.ts

@@ -0,0 +1,18 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { uninstallCommand } from './uninstall.js';
+import yargs from 'yargs';
+
+describe('extensions uninstall command', () => {
+  it('should fail if no source is provided', () => {
+    const validationParser = yargs([]).command(uninstallCommand).fail(false);
+    expect(() => validationParser.parse('uninstall')).toThrow(
+      'Not enough non-option arguments: got 0, need at least 1',
+    );
+  });
+});