Add MutateStruct functionality

[howardjohn]

To test state transitions (for example, in a k8s controller) it's useful to mutate values rather than completely generate new structs. A brand new struct is likely too different and would mis coverage that modifying a few fields would give.

For example, we could test when a Pod IP changes or a label selector is added.

I think this could use similar logic to the existing fuzzStruct but just pick an element (struct field, map key, or array index) to mutate instead of setting all elements.

WDYT? Maybe related to istio/istio#43445

[avirtopeanu-ionos]

perhaps I don't fully grasp the desired outcome here, but why not use f.Fuzz for this? https://go.dev/security/fuzz/

[howardjohn]

It only supports primitive types not structs. This takes in a primitive (byte ) and converts to structs for use with fuzzing

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On Mon, Feb 20, 2023, 6:13 AM Alexandru-Claudius Virtopeanu < ***@***.***> wrote: perhaps I don't fully grasp the desired outcome here, but why not use f.Fuzz for this? https://go.dev/security/fuzz/ — Reply to this email directly, view it on GitHub <#109 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAEYGXNAY5VRIG75MIPT2TLWYN32NANCNFSM6AAAAAAVBEZCCQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>