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RealDiff

Runtime behavior diffs for pull requests.

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RealDiff screenshot

About RealDiff

RealDiff finds runtime behavior changes that ordinary source review misses .

It builds two Git revisions, observes their tests, learns a noise baseline from three base runs, and reports the first changed behavior in each call tree. A source diff tells you what was edited. RealDiff tells you what the edit did, including effects in files the pull request never touched.

List.Sort is not stable; OrderBy is. In the included demo, that one-line infrastructure change alters an unedited pricing engine:

The edited helper is in Infrastructure.Collections ; the observed effect is in Commerce.Pricing . Run the included demo below, or inspect the maintained public .NET demo pull request and its successful hosted run .

Prerequisites for this .NET demo: Git, .NET 8 SDK, and PowerShell 7. Java analysis additionally requires a JDK and the repository's Maven/Gradle wrapper or corresponding system tool; Node analysis requires Node.js and the package manager selected by its lockfile.

The proof creates a temporary proposed-change tree, changes only SortingExtensions.cs , runs the base twice plus the change once, and writes findings.json . It verifies:

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