12c3c3f81dtest: mining: add coverage for GBT's "coinbasevalue" result field (Sebastian Falbesoner) Pull request description: This PR adds missing coverage for the "coinbasevalue" result field of the `getblocktemplate` RPC call. Specifically, the introduced test checks that the value is set to claim the full block reward (subsidy plus fees). Can be verified with the following patch, which succeeds on master and fails on the PR branch: ```diff diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp index a935810d91..ba9ac9dadb 100644 --- a/src/rpc/mining.cpp +++ b/src/rpc/mining.cpp @@ -998,7 +998,7 @@ static RPCHelpMan getblocktemplate() result.pushKV("previousblockhash", block.hashPrevBlock.GetHex()); result.pushKV("transactions", std::move(transactions)); result.pushKV("coinbaseaux", std::move(aux)); - result.pushKV("coinbasevalue", block.vtx[0]->vout[0].nValue); + result.pushKV("coinbasevalue", block.vtx[0]->vout[0].nValue - 1); result.pushKV("longpollid", tip.GetHex() + ToString(nTransactionsUpdatedLast)); result.pushKV("target", hashTarget.GetHex()); result.pushKV("mintime", GetMinimumTime(pindexPrev, consensusParams.DifficultyAdjustmentInterval())); ``` I'm not sure how relevant this field is nowadays in real-world mining scenarios (we use it for the signet miner at least), but it seems useful to have a test for it anyways. Stumbled upon this while looking at https://github.com/bitcoin-inquisition/bitcoin/pull/111. ACKs for top commit: maflcko: lgtm ACK12c3c3f81dSjors: ACK12c3c3f81dTree-SHA512: ae10f63c99b21cf7771feefe3d0e47b2e0d511aceb344cf11efa9182d78f2960f1e079797b8a36db110a3c54acb27a3706413a710a74bf56aed29ea162a6aab2
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