What do you need to do before you can test your app?

To ensure your app is ready for testing, adding page navigation is a crucial step. Navigation allows users to seamlessly interact with different parts of your application, ensuring that all functionalities can be accessed and tested. Without proper navigation, users will struggle to navigate between screens, which can lead to confusion and limit the testing of the app's features.

In the context of testing, having well-structured navigation is essential. It allows testers to move between pages, check workflows, and validate the overall user experience effectively. Testing is significantly hindered if users are unable to reach certain areas of the application, thus making navigation a foundational requirement.

While other steps like installing necessary plugins, configuring user roles, and setting up data sources are important for the full functionality of the app, they do not directly facilitate the user's journey throughout the app during testing. Hence, prioritizing the addition of page navigation directly contributes to an effective testing process.