This paper presents a technique to measure and visualize execution-path coverage of test cases in the context of model-based software systems testing. Our technique provides visual feedback of the tests, their coverage, and their diversity. We provide two types of visualizations for path coverage based on so-called state-based graphs and path-based graphs. Our approach is implemented by extending the Modbat tool for model-based testing and experimentally evaluated on a collection of examples, including the ZooKeeper distributed coordination service. Our experimental results show that the state-based visualization is good at relating the tests to the model structure, while the path-based visualization shows distinct paths well, in particular linearly independent paths. Furthermore, our graph abstractions retain the characteristics of distinct execution paths, while removing some of the complexity of the graph.
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