fix: removed outdated test libraries

Close #2429

src/guide/scaling-up/testing.md

@@ -105,9 +105,7 @@ A component can be tested in two ways:
 
 ### Other Options {#other-options}
 
-- [Peeky](https://peeky.dev/) is another fast unit test runner with first-class Vite integration. It is also created by a Vue core team member and offers a GUI-based testing interface.
-
-- [Jest](https://jestjs.io/) is a popular unit testing framework, and can be made to work with Vite via the [vite-jest](https://github.com/sodatea/vite-jest) package. However, we only recommend Jest if you have an existing Jest test suite that needs to be migrated over to a Vite-based project, as Vitest offers a more seamless integration and better performance.
+- [Jest](https://jestjs.io/) is a popular unit testing framework. However, we only recommend Jest if you have an existing Jest test suite that needs to be migrated over to a Vite-based project, as Vitest offers a more seamless integration and better performance.
 
 ## Component Testing {#component-testing}