With the continuous increase in the use of software, the testing of software becomes more important as well. For this reason, the idea of test automation has become increasingly popular over the course of time. The procedure of test automation is also already introduced for testing ECUs. This currently works with a software called "ECU-Test" developed by TraceTronic GmbH. In this software so-called Test Packages are created, which can be imagined as a step by step instruction. These test packages are then automatically executed by the ECU-Test software. In this process a bottle neck was discovered. The creation of Test Packages is currently only possible in the ECU-Test Software, which is limited in number for each group working with it. Therefore the few ECU- Test Softwares are not used for actual testing, but mainly for creating the Test Packages. In the course of this work the found bottle neck will be fixed. The creation of the Test Packages is outsourced to an external software called "Test Package Creator". This software will be realized in the context of this work from planning to implementation. The software is implemented on the basis of already researched methods of software development. For this purpose, the ECU-Test Software is first analyzed with a focus on the Test Packages. Then a concept of the most important requirements is created and based on this the software is finally developed. At the end an evaluation including a survey of some employees should follow, which could not be done due to the outbreak of the COVID-19 pandemic. The survey that would have been used is included in this paper.