The diffs don't provide much value

[Bios-Marcel]

The diffs currently don't provide a lot of value, since a single line changed is displayed as a many-line diff. I am not sure if this is an issue on my machine or simply how the feature was implemented.

[gtramontina]

I attempted to address this here https://github.com/gtramontina/ooze#prerequisites (second paragraph).

Not sure if this is what you’re experiencing, though.

Open to alternative implementations! 😅

Edit: permalink:

ooze/readme.md

Line 38 in 1255479

When Ooze reports that it found a living mutant, it will print a diff of the changes the virus made to the source file. The mutant source is printed using Go's [`go/format`](https://pkg.go.dev/go/format) package. This means that, if your source code isn't gofmt'd, the diff may contain some formatting changes that are not relevant to the mutation. This isn't a prerequisite per se, but for a better experience, it is recommended that you run `gofmt` on your source files.

[Bios-Marcel]

Yes, this seems to solve it. Weird bug though :D I guess we could gofmt both before comparing as a workaround?

[gtramontina]

Sorry about the delay… I guess running gofmt on the source "on the fly" before comparing can potentially yeild diffs that point to the wrong line/place, generating confusion… 🤔 Hence the recommendation on the readme. I do agree that the opposite can be confusing as well. Perhaps adding a note at the end of the summary mentioning it could help? Something like: If your diffs look weird, consider running gofmt before the mutation tests.