test: Activate segwit in TestChain100Setup

src/test/util/setup_common.cpp

@@ -196,12 +196,6 @@ TestingSetup::~TestingSetup()
 
 TestChain100Setup::TestChain100Setup()
 {
-    // CreateAndProcessBlock() does not support building SegWit blocks, so don't activate in these tests.
-    // TODO: fix the code to support SegWit blocks.
-    gArgs.ForceSetArg("-segwitheight", "432");
-    // Need to recreate chainparams
-    SelectParams(CBaseChainParams::REGTEST);
-
     // Generate a 100-block chain:
     coinbaseKey.MakeNewKey(true);
     CScript scriptPubKey = CScript() << ToByteVector(coinbaseKey.GetPubKey()) << OP_CHECKSIG;
@@ -222,12 +216,7 @@ CBlock TestChain100Setup::CreateAndProcessBlock(const std::vector<CMutableTransa
     for (const CMutableTransaction& tx : txns) {
         block.vtx.push_back(MakeTransactionRef(tx));
     }
-    // IncrementExtraNonce creates a valid coinbase and merkleRoot
-    {
-        LOCK(cs_main);
-        unsigned int extraNonce = 0;
-        IncrementExtraNonce(&block, ::ChainActive().Tip(), extraNonce);
-    }
+    RegenerateCommitments(block);
 
     while (!CheckProofOfWork(block.GetHash(), block.nBits, chainparams.GetConsensus())) ++block.nNonce;