This book constitutes the refereed proceedings of the 11th International Conference on Tests and Proofs, TAP 2017, held as part of STAF 2017, in Marburg, Germany, in July 2017.The 9 full papers and 1 invited paper presented in this volume were carefully reviewed and selected from 16 submissions.

Abstraction Refinement for the Analysis of Software Product Lines.- Hybrid Information Flow Analysis for Real-World C Code.- Symbolic Execution of Transition Systems with Function Summaries.- Unit Testing of Database-Driven Java Enterprise Edition Applications.- Model-Based Testing of Probabilistic Systems with Stochastic Time.- Test Suite Reduction in Idempotence Testing of Infrastructure as Code.- Checking UML and OCL Model Behavior with Filmstripping and Classifying Terms.- Skolem Function Continuation for Quantified Boolean Formulas.- WSCLim: A Tool for Model-Based Testing of WS-BPEL Compositions under Load Conditions.- Testing a Saturation-Based Theorem Prover: Experiences and Challenges.