This master's thesis deals with analysis , design and implementation of information system for bailiff office . The system provides functionality for managing bailiff's files , their subjects , appropriate documents , financial requirements and cooperation with third parties . Moreover , the system enables communication with data boxes for receiving and sending messages and performing vetting in registers of economic subjects . The application implements also multitenant architecture , which means the system can serve multiple offices . The information system is realised as a web application in ASP. NET MVC technology and written in C\# language . The client side of the application is composed of AngularJS and Bootstrap frameworks .

The aim of the thesis was to design, implement and evaluate the results of automatic tests for the JavaScript Restrictor project, which is being developed as a web browser extension. The tests are divided into three levels - unit, integration, and system. The Unit Tests verify the behavior of individual features, the Integration Tests verify the correct wrapping of browser API endpoints, and the System Tests check that the extension does not suppress the desired functionality of web pages. The System Tests are implemented for parallel execution in a distributed environment which has succeeded in achieving an almost directly proportional reduction in time with respect to the number of the tested nodes. The benefit of this work is detection of previously unknown errors in the JavaScript Restrictor extension and provision of the necessary information that allowed to fix some of the detected bugs.