The goal of this thesis is to design and implement module for testing graphical user interfaces of integrated development environment Eclipse Che. The biggest priority of this thesis is to make the module compatible with module for testing graphical user interfaces of editor Visual Studio Code. In order to ensure compatibility between both editors, new module was created to define common application programming interface for graphical components. Created solution enables Visual Studio Code extension developers to use existing user interface tests in Eclipse Che IDE with minimal effort. As result source code can be shared which reduces maintenance costs.