Embodiments of the present invention provide systems, methods, and computer storage media directed at automated testing of shell scripts and core functionality of a software application under test utilizing the same testing environment. In embodiments, a testing environment that is configured to perform automated testing of core functionality of a software application under test is provided with a test library that extends the testing capabilities of the testing environment to also perform automated testing of shell scripts of the software application under test. The core functionality can be encoded in a first programming language, while the shell scripts are encoded in a second programming language. Other embodiments may be described and/or claimed.