This book constitutes the refereed proceedings of the 35th IFIP WG 6.1 International Conference on Testing Software and Systems, ICTSS 2023, held in Bergamo, Italy, during September 18-20, 2023.

The 13 full papers presented together with 6 short papers and one journal paper were carefully reviewed and selected from 56 submissions.

Failure Analysis in CPS Simulink Models.- Test case generation.- A Rapid Review on Fuzz Security Testing for Software Protocol Implementations.- Enhancing Synthetic Test Data Generation with Language Models Using aMore Expressive Domain-Specific Language.- On the Evaluation of Photometric Stereo Application Testing.- Seeding Contradiction: a fast method for generating full-coverage test suites.- Test Automation and Design.- Automated Testing of Systems of Systems.- Empirical Verification of TQED - a New Test Design Heuristic Technique.- How Do Different Types of Testing Goals Affect Test Case Design?.- Multi-device, robust, and integrated Android GUI testing: A conceptualframework.- RQCODE: Security Requirements Formalization with Testing.- Understanding Problem Solving in Software Testing: An Exploration ofTester Routines and Behavior.- Who is Afraid of Test Smells? Assessing Technical Debt fromDeveloper Actions.- Model Based Testing.- A Systematic Literature Review on prioritizing software test cases using Markov chains.- Complete Property-Oriented Module Testing.- Compositionality in Model-Based Testing.- Prioritizing test cases with Markov Chains: a Preliminary Investigation.- Probabilistic approach for minimizing checking sequences for nondeterministic FSMs.- AI and Smart Contracts Testing.- Applying Pairwise Combinatorial Testing to Large Language Model Testing.- CATANA: Replay Testing for the Ethereum Blockchain.- GResilience: Trading off between the Greenness and the Resilience of CollaborativeAI Systems.- Testing Quality of Training in QoE-aware SFC Orchestration based on DRL Approach.

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