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<!DOCTYPE html>
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<title>Covering Specs and Code — Fuzzing with Fandango</title>
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<h1>Covering Specs and Code</h1>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#grammar-coverage">Grammar Coverage</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#code-coverage">Code Coverage</a></li>
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<section class="tex2jax_ignore mathjax_ignore" id="covering-specs-and-code">
<span id="sec-diversity"></span><h1>Covering Specs and Code<a class="headerlink" href="#covering-specs-and-code" title="Link to this heading">#</a></h1>
<p>During input generation, Fandango attempts to <em>cover</em> as many behaviors as possible.
There are three ways to do so:</p>
<ul class="simple">
<li><p><strong>Grammar coverage</strong> - that is, covering <em>alternatives in the grammar</em>;</p></li>
<li><p><strong>Code coverage</strong> - that is, covering <em>alternatives in the program under test</em>; and</p></li>
<li><p><strong>Constraint coverage</strong> - that is, covering <em>alternatives in constraints</em>.</p></li>
</ul>
<p>Fandango is set to satisfy all these goals in unison.</p>
<section id="grammar-coverage">
<h2>Grammar Coverage<a class="headerlink" href="#grammar-coverage" title="Link to this heading">#</a></h2>
<p>During <em>input generation</em>, Fandango favors individual inputs that have a high <em>grammar coverage</em> - that is, they cover as many alternatives as possible.
It does so after construction, as part of evaluating the fitness of individual inputs.</p>
<p>During <a class="reference internal" href="Protocols.html#sec-protocols"><span class="std std-ref"><em>protocol testing</em></span></a>, Fandango already produces such interactions <em>by construction</em> – that is, with every new iteration, it tries to cover parts of the grammar (= states, messages, and transitions) that have not been seen yet.</p>
<p>Grammar coverage is determined and achieved using the <span class="math notranslate nohighlight">\(k\)</span>-path metric by <span id="id1">Havrikov and Zeller [<a class="reference internal" href="About.html#id16" title="Nikolas Havrikov and Andreas Zeller. Systematically covering input structure. In Proceedings of the 34th IEEE/ACM International Conference on Automated Software Engineering, ASE '19, 189–199. IEEE Press, 2020. URL: https://doi.org/10.1109/ASE.2019.00027, doi:10.1109/ASE.2019.00027.">HZ20</a>]</span>.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 1.2: </span>For version 1.2, during input generation, Fandango will also achieve grammar coverage by construction.</p>
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<section id="code-coverage">
<h2>Code Coverage<a class="headerlink" href="#code-coverage" title="Link to this heading">#</a></h2>
<p>As of version 1.2, Fandango will provide experimental support for guidance by code coverage.
Details will be added here.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 1.2: </span>This feature is planned for Fandango 1.2.</p>
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<section id="constraint-coverage">
<h2>Constraint Coverage<a class="headerlink" href="#constraint-coverage" title="Link to this heading">#</a></h2>
<p>Future versions of Fandango will aim to achieve diversity by fulfilling different alternatives in constraints.
Once this is complete, details will be added here.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 1.x: </span>This feature is planned for a future Fandango version.</p>
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