This special issue contains extended versions of two papers from the 11th IEEE International Conference on Software Testing, Validation & Verification (ICST 2018). ICST strives to provide an open forum for researchers, scientists, engineers, and practitioners working on software testing to present and discuss the latest research findings, ideas and developments. This was no exception at ICST 2018, where the collocation with the quarterly meeting of Swedish Association of Software Testing (SAST) led to strong industry presence and cross pollination of ideas.

Based on the reviews from the program committee members, as well as the discussion with the Editors‐in‐Chief about their relevance to STVR, we invited authors of three papers to extend their papers and submit to the special section. The submitted manuscript went through a rigorous reviewing process by a panel of experts that included, but was not limited to, the members of the ICST 2018 program committee. During the process, two of the three papers were handled by one of us (Prof. Feldt) due to conflicts of interest. After finalizing the review and revision process two papers were accepted for publication in this special issue.

The first paper, “DeMiner: Test Generation for High Test Coverage through Mutant Exploration” by Shin Hong, Yunho Kim, and Moonzoo Kim, introduces a way of using mutation analysis to improve the code coverage achieved by concolic testing. Called “Invasive Software Testing”, the proposed technique exploits additional information about the concrete and dynamic behaviour of the System Under Test, via mutation testing, to set goalposts for improved concolic testing.

The second paper, “Effective Repair of Internationalization Presentation Failures in Web Applications Using Style Similarity Clustering and Search‐Based Techniques” by Sonal Mahajan, Abdulmajeed Alameer, Phil McMinn, and William Halfond, introduces an automated repair technique for presentation failures in web pages regarding internationalization. The proposed technique, IFix+, can address presentation failures that stem from interactions of multiple style components by clustering DOM elements based on their visual appearances. Subsequently, IFix+ uses a search based approach to find a CSS patch that avoids introduction of any new failures.

We express our thanks to everyone who contributed to the success of ICST 2018, as well as to this special section. We are grateful to the authors for extending their paper and submitting their valuable work to STVR. We would also like to express our gratitude to everyone who worked hard to make ICST 2018 the great success it was: in the midst of a global pandemic, the memory of the conference is something we all cherish deeply. In particular, we thank the general chair, Hans Hansson. Finally, we would like to thank both Robert Hierons and Tao Xie, for their support and guidance for this special issue.

本期特刊包含第11届IEEE软件测试，验证和验证国际会议（ICST 2018）的两篇论文的扩展版本。ICST致力于为从事软件测试的研究人员，科学家，工程师和从业人员提供一个开放的论坛，以介绍和讨论最新的研究发现，想法和发展。在ICST 2018上也不例外，该会议与瑞典软件测试协会（SAST）季度会议的结合导致了强大的行业影响力和想法的异花授粉。

基于计划委员会成员的评论，以及与总编有关STVR相关性的讨论，我们邀请三篇论文的作者进行扩展，并提交至特别版块。提交的手稿由一个专家小组进行了严格的审查，该小组包括但不限于ICST 2018计划委员会的成员。在此过程中，由于利益冲突，我们中的一位（费尔德教授）处理了三篇论文中的两篇。在完成评审和修订过程后，本特刊接受了两篇论文发表。

由Shin Hong，Yunho Kim和Moonzoo Kim撰写的第一篇论文“ DeMiner：通过变异探索实现高测试覆盖率的测试生成”介绍了一种使用变异分析的方法来改善通过condicate测试实现的代码覆盖率的方法。所提出的技术被称为“入侵软件测试”，它通过变异测试利用有关被测系统具体和动态行为的附加信息，以设置目标杆，以进行改进的condicolic测试。

第二篇论文，由Sonal Mahajan，Abdulmajeed Alameer，Phil McMinn和William Halfond撰写的“使用样式相似性聚类和基于搜索的技术对Web应用程序中的国际化演示失败进行有效修复”介绍了一种针对与以下内容有关的网页中的演示失败的自动修复技术：国际化。所提出的技术IFix +可以通过基于DOM元素的视觉外观来聚类DOM元素，从而解决由于多个样式组件的交互而导致的显示失败。随后，IFix +使用基于搜索的方法来查找CSS补丁，从而避免引入任何新的故障。

我们感谢为ICST 2018的成功做出贡献的每个人以及这一特殊部分。我们感谢作者扩展论文并将他们的宝贵工作提交给STVR。我们还要感谢所有为使ICST 2018取得巨大成功而付出努力的人：在全球大流行中，对会议的记忆是我们所有人都深切珍惜的事情。特别感谢主席汉斯·汉森（Hans Hansson）。最后，我们要感谢Robert Hierons和Tao Xie对这个特殊问题的支持和指导。