fix: cypress, jest and playwright links

guides/plugins/plugins/testing/index.md

@@ -7,14 +7,30 @@ nav:
 
 # Testing
 
-When it comes to testing, you might immediately think about unit tests. Of course, we have got you covered then:
+Robust testing is crucial for developing reliable and maintainable Shopware plugins and themes. Shopware provides tooling and guidance for several types of tests, ensuring your code is production-ready and meets community standards.
 
+## Unit Testing
+
+Unit testing is the base layer of an effective test strategy. Shopware supports both PHP backend logic and JavaScript components (for Storefront and Administration):
+
+Use PHPUnit to write and run backend unit tests for your PHP code.
+
 <PageRef page="php-unit" />
 
-The following section also covers unit tests in [Storefront](./jest-storefront.md) and [Administration](./jest-admin.md).
+Use Jest to test Storefront JS and Vue components following modern best practices.
+
+<PageRef page="jest-storefront" />
+
+Test custom Administration panel modules and components using Jest with the Shopware admin setup.
+
+<PageRef page="jest-admin" />
+
+## End-to-End (E2E) Testing
+
+For simulating real user journeys and integration scenarios, Shopware recommends end-to-end (E2E) testing. Playwright is the officially supported tool for automating entire workflows across the application.
 
-Even though unit tests are definitely great, you might want to do some end-to-end testing, which is covered here:
+Automate browser interactions to verify plugins and customizations work as intended in real-world Shopware environments.
 
-<PageRef page="playwright/index" />
+<PageRef page="playwright/" />
 
-<PageRef page="cypress/cypress-end-to-end-testing" />
+Refer to the individual guides for setup, examples, and best practices for each testing type.