@Test
  public void shouldReturnZeroForNonBlobForks() {
    final CancunTargetingGasLimitCalculator gasLimitCalculator =
        new CancunTargetingGasLimitCalculator(
            0L, FeeMarket.cancunDefault(0L, Optional.empty()), new ShanghaiGasCalculator());
    configureProtocolSpec(
        FeeMarket.london(5, Optional.empty()), new ShanghaiGasCalculator(), gasLimitCalculator);
    assertThat(requestBlobBaseFee().getResult()).isEqualTo("0x0");
  }
Tests that the method returns zero for forks that do not support blob transactions
ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthBlobBaseFeeTest.java