In this chapter, we covered some of the major testing frameworks available in Scala, which largely inherit from the rich Java ecosystem. Moreover, by applying property-based testing via ScalaCheck, we explored novel approaches to enhance the testing quality. To further improve the quality of the software, interested readers can look at additional SBT plugins that are listed on the http://www.scala-sbt.org/ website, notably scalastyle-sbt-plugin to check the coding style or the various code-coverage plugins. In the next chapter, we are going to dive into the huge area of web development and take advantage of the power of the Scala language to make the development of portals and web apps a productive and fun activity.