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In enterprise-scale companies, where processing complex test results is often a time-consuming task for testers and developers, the need for an Application Programming Interface (API) testing visualization tool is vital. Furthermore, as various stakeholders require insights into the API testing results, a clear dashboard can facilitate effective communication among them. 

This thesis aims to fulfill the need for a generic API testing visualization tool within the mobile network industry through the implementation of TestUp, a user-friendly solution. TestUp simplifies the analysis of complex API test results for various stakeholders, including testers, developers, managers, and product owners. To accomplish the objectives of this thesis, an industrial case study was conducted at Nokia, beginning with a pre-study phase to explore industry needs and challenges. TestUp was designed based on the Agile methodology, evolving through feedback from industry and academia. Additionally, a post-tool questionnaire was employed to gather data on the tool’s effectiveness and limitations. Subsequently, the data analysis was conducted using the thematic analysis approach. 

The thesis demonstrates that TestUp provides valuable benefits to stakeholders by effectively addressing critical issues found in existing tools. TestUp is compatible with a range of test automation frameworks and serves as a user-friendly tool for visualizing test coverage. These facts fulfill the company's requirements. All in all, this thesis improves the analysing of API testing results within the mobile network management sector. Additionally, future work can involve enhancing the tool by adding extra features, such as export functionality and the ability to indicate timeout requests. Also, integrating TestUp with the continuous integration pipelines is a potential area for future work.