Strapi is a headless content management system (CMS) for NodeJS-based applications, allowing developers to build fast applications with client-side frameworks like Vue.js, React, Angular, etc., or Jamstack applications. To ensure an application is free from bugs and other abnormalities, software testing is crucial. This article explores unit testing with Jest, Supertest, and sqlite3, as well as end-to-end testing with Nightwatch.js in a Strapi application. Unit testing involves testing individual units of the application, while end-to-end testing evaluates the overall flow of the software, including communication with subsystems, interfaces, and databases. The article provides a step-by-step guide on how to set up Jest, Supertest, sqlite3, and Nightwatch.js for unit and end-to-end testing in a Strapi application.