Not quite fake: but this might be close enough? https://github.com/kubernetes-sigs/kind
Alternatively you could create a CRI plugin that does what you want. https://github.com/kubernetes/kubernetes/blob/242a97307b3407...
Alternatively you could create a CRI plugin that does what you want. https://github.com/kubernetes/kubernetes/blob/242a97307b3407...
The CRI plugin sounds like probably the right thing to do. Everything is real up until actually running stuff.