chore: test case for prompt-installation

packages/package-utils/__tests__/index.test.ts

@@ -1,11 +1,19 @@
 'use strict';
 
-import { packageExists } from '../src';
+import * as packageUtils from '../src';
+import ExternalCommand from '../../webpack-cli/lib/commands/ExternalCommand';
+
+const mock = jest.spyOn(packageUtils, 'promptInstallation')
+mock.mockImplementation(() => { throw new Error() })
 
 describe('@webpack-cli/package-utils', () => {
     it('should check existence of package', () => {
-        const exists = packageExists('@webpack-cli/info');
+        const exists = packageUtils.packageExists('@webpack-cli/info');
 
         expect(exists).toBeTruthy();
     });
+
+    it('should not throw if the user interrupts', async () => {
+        await expect(ExternalCommand.run('@webpack-cli/info')).resolves.not.toThrow();
+    });
 });