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Documents authored by Mezzetti, Gianluca

Document
DOI: 10.4230/LIPIcs.ECOOP.2018.7
Type Regression Testing to Detect Breaking Changes in Node.js Libraries

Authors: Gianluca Mezzetti, Anders Møller, and Martin Toldam Torp

Published in: LIPIcs, Volume 109, 32nd European Conference on Object-Oriented Programming (ECOOP 2018)

Abstract
The npm repository contains JavaScript libraries that are used by millions of software developers. Its semantic versioning system relies on the ability to distinguish between breaking and non-breaking changes when libraries are updated. However, the dynamic nature of JavaScript often causes unintended breaking changes to be detected too late, which undermines the robustness of the applications. We present a novel technique, type regression testing, to automatically determine whether an update of a library implementation affects the types of its public interface, according to how the library is being used by other npm packages. By leveraging available test suites of clients, type regression testing uses a dynamic analysis to learn models of the library interface. Comparing the models before and after an update effectively amplifies the existing tests by revealing changes that may affect the clients. Experimental results on 12 widely used libraries show that the technique can identify type-related breaking changes with high accuracy. It fully automatically classifies at least 90% of the updates correctly as either major or as minor or patch, and it detects 26 breaking changes among the minor and patch updates.
Cite as

Gianluca Mezzetti, Anders Møller, and Martin Toldam Torp. Type Regression Testing to Detect Breaking Changes in Node.js Libraries. In 32nd European Conference on Object-Oriented Programming (ECOOP 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 109, pp. 7:1-7:24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{mezzetti_et_al:LIPIcs.ECOOP.2018.7,
  author =	{Mezzetti, Gianluca and M{\o}ller, Anders and Torp, Martin Toldam},
  title =	{{Type Regression Testing to Detect Breaking Changes in Node.js Libraries}},
  booktitle =	{32nd European Conference on Object-Oriented Programming (ECOOP 2018)},
  pages =	{7:1--7:24},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-079-8},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{109},
  editor =	{Millstein, Todd},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2018.7},
  URN =		{urn:nbn:de:0030-drops-92128},
  doi =		{10.4230/LIPIcs.ECOOP.2018.7},
  annote =	{Keywords: JavaScript, semantic versioning, dynamic analysis}
}
Document
DOI: 10.4230/DARTS.4.3.8
Type Regression Testing to Detect Breaking Changes in Node.js Libraries (Artifact)

Authors: Gianluca Mezzetti, Anders Møller, and Martin Toldam Torp

Published in: DARTS, Volume 4, Issue 3, Special Issue of the 32nd European Conference on Object-Oriented Programming (ECOOP 2018)

Abstract
This artifact provides an implementation of a novel technique, type regression testing, to automatically determine whether an update of a npm library implementation affects the types of its public interface, according to how the library is being used by other npm packages. Type regression testing is implemented in the tool NoRegrets. A run of NoRegrets is parameterized with a pre-update and post-update version of the library, and it consists of three fully automatic phases. First, NoRegrets fetches a list of clients that depend upon the pre-update library, and that have a test suite that succeeds on the pre-update version. Second, NoRegrets uses an ECMAScript 6 proxy instrumentation to generate the API model of both the pre-update and post-update libraries, based on observations of how the client test suites interact with the library. Third, the two models are compared, and inconsistencies are reported as type regressions. This artifact contains the source code and an installation of NoRegrets, with a guide for how to use the tool and reproduce the experimental results presented in the paper.
Cite as

Gianluca Mezzetti, Anders Møller, and Martin Toldam Torp. Type Regression Testing to Detect Breaking Changes in Node.js Libraries (Artifact). In Special Issue of the 32nd European Conference on Object-Oriented Programming (ECOOP 2018). Dagstuhl Artifacts Series (DARTS), Volume 4, Issue 3, pp. 8:1-8:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Article{mezzetti_et_al:DARTS.4.3.8,
  author =	{Mezzetti, Gianluca and M{\o}ller, Anders and Torp, Martin Toldam},
  title =	{{Type Regression Testing to Detect Breaking Changes in Node.js Libraries (Artifact)}},
  pages =	{8:1--8:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2018},
  volume =	{4},
  number =	{3},
  editor =	{Mezzetti, Gianluca and M{\o}ller, Anders and Torp, Martin Toldam},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.4.3.8},
  URN =		{urn:nbn:de:0030-drops-92394},
  doi =		{10.4230/DARTS.4.3.8},
  annote =	{Keywords: JavaScript, semantic versioning, dynamic analysis}
}
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