Mine one block, force a fork

[dpc]

I'd like to write a testing framework for stuff that integrates (runs on top of) ethereum node. To ensure correct handling of of corner cases I'd like to simulate things like eg. reorgs.

I was googling for regtest for ethereum and I've found things like: https://wiki.parity.io/Private-development-chain . It seems it covers what I need from a node itself, but I need to tightly control mining.

I need to be able to:

• mine exactly one block on demand
• force a fork - make the miner mine on top of an arbitrary block instead of a "longest one"

Describe the solution you'd like
I would like two command line arguments / rpcs:

• stop-after-one-block
• force-height=12345

that would accomplish the above.

Describe alternatives you've considered
I haven't considered much and I have no idea about ETH mining. I'm open for suggestions.

I tried to ask the same question in ethminer github, but they've told me that I should probably use cpuminer provided by the network client itself. ethereum-mining/ethminer#1522

[jam10o-new]

This would actually be quite involved to implement, as it would need a new consensus engine/modification of an existing one, and would probably have to come after #8259 is implemented.

[adria0]

Closing issue due to its stale state.