private void executeBlockchainTest(
      final Map<String, BlockchainReferenceTestCaseSpec> blockchainTests) {
    blockchainTests.forEach(this::traceTestSpecs);
  }
Default constructor for the BlockchainTestSubCommand class. This constructor doesn't take any
arguments and initializes the parentCommand to null. PicoCLI requires this constructor.
ethereum/evmtool/src/main/java/org/hyperledger/besu/evmtool/BlockchainTestSubCommand.java