@Before
  public void before() {
    nettyByteBufLeakHelper.beforeTest();
  }
Initialize parameters common to all tests. This constructor is exposed for use by {@link CloudRouterTest}.
@param testEncryption {@code true} to test with encryption enabled. {@code false} otherwise
@param metadataContentVersion the metadata content version to test with.
@param includeCloudDc {@code true} to make the local datacenter a cloud DC.
@throws Exception if initialization fails
ambry-router/src/test/java/com/github/ambry/router/NonBlockingRouterTestBase.java