@Test
  public void assertPowMiningPreMerge() {
    miningConfiguration =
        ImmutableMiningConfiguration.builder()
            .mutableInitValues(MutableInitValues.builder().isMiningEnabled(true).build())
            .build();
    var transCoordinator = buildTransitionCoordinator(powBuilder, postMergeBuilder);
    assertThat(transCoordinator.isMiningBeforeMerge()).isTrue();
  }
We only bother testing transitionControllerBuilder for PoW and Clique since those are the only
network types that are transitioning to PoS.
app/src/test/java/org/hyperledger/besu/controller/TransitionControllerBuilderTest.java