[test] move mining helper functions into test library

2 files changed, 75 insertions, 0 deletions

diff --git a/src/test/util/mining.cpp b/src/test/util/mining.cpp
new file mode 100644
index 0000000000..30f0f5d7e6
--- /dev/null
+++ b/src/test/util/mining.cpp
@@ -0,0 +1,51 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <test/util/mining.h>
+
+#include <chainparams.h>
+#include <consensus/merkle.h>
+#include <key_io.h>
+#include <miner.h>
+#include <pow.h>
+#include <script/standard.h>
+#include <validation.h>
+
+CTxIn generatetoaddress(const std::string& address)
+{
+    const auto dest = DecodeDestination(address);
+    assert(IsValidDestination(dest));
+    const auto coinbase_script = GetScriptForDestination(dest);
+
+    return MineBlock(coinbase_script);
+}
+
+CTxIn MineBlock(const CScript& coinbase_scriptPubKey)
+{
+    auto block = PrepareBlock(coinbase_scriptPubKey);
+
+    while (!CheckProofOfWork(block->GetHash(), block->nBits, Params().GetConsensus())) {
+        ++block->nNonce;
+        assert(block->nNonce);
+    }
+
+    bool processed{ProcessNewBlock(Params(), block, true, nullptr)};
+    assert(processed);
+
+    return CTxIn{block->vtx[0]->GetHash(), 0};
+}
+
+std::shared_ptr<CBlock> PrepareBlock(const CScript& coinbase_scriptPubKey)
+{
+    auto block = std::make_shared<CBlock>(
+        BlockAssembler{Params()}
+            .CreateNewBlock(coinbase_scriptPubKey)
+            ->block);
+
+    LOCK(cs_main);
+    block->nTime = ::ChainActive().Tip()->GetMedianTimePast() + 1;
+    block->hashMerkleRoot = BlockMerkleRoot(*block);
+
+    return block;
+}
diff --git a/src/test/util/mining.h b/src/test/util/mining.h
new file mode 100644
index 0000000000..afe4de684f
--- /dev/null
+++ b/src/test/util/mining.h
@@ -0,0 +1,24 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_TEST_UTIL_MINING_H
+#define BITCOIN_TEST_UTIL_MINING_H
+
+#include <memory>
+#include <string>
+
+class CBlock;
+class CScript;
+class CTxIn;
+
+/** Returns the generated coin */
+CTxIn MineBlock(const CScript& coinbase_scriptPubKey);
+
+/** Prepare a block to be mined */
+std::shared_ptr<CBlock> PrepareBlock(const CScript& coinbase_scriptPubKey);
+
+/** RPC-like helper function, returns the generated coin */
+CTxIn generatetoaddress(const std::string& address);
+
+#endif // BITCOIN_TEST_UTIL_MINING_H