@Override
  public void configure(final Map<String, ?> configs, final boolean isKey) {
    this.isKey = isKey;
    delegate.configure(configs, isKey);
  }
@Test
  public void shouldConfigureDelegate() {
    // Given:
    final Map<String, ?> configs = ImmutableMap.of("some", "thing");

    // When:
    deserializer.configure(configs, true);

    // Then:
    verify(delegate).configure(configs, true);
  }