AUnit: A Test Automation Tool for Alloy

Software models help improve the reliability of software systems: models can convey requirements, and can analyze design and implementation properties. A key strength of Alloy, a commonly used first-order modeling language, is the Alloy Analyzer tool-set. The Analyzer allows users to execute commands over models by leveraging a fully automatic SAT-based analysis engine. However, prior to the introduction of AUnit - a testing framework for Alloy - users had to rely on ad-hoc practices to validate their models. In this paper, we present our efforts to establish a formal testing environment in the Alloy Analyzer by creating an AUnit extension. We present additional grammar to support test case creation, as well as the details for executing test suites, calculating test suite coverage, and automatically generating test suites. The tool is available as a stand-alone executable at the following URL (https://sites.google.com/view/aunitanalyzer).