@Override
  public R transform(final K readOnlyKey, final GenericRow value) {
    return delegate.transform(
        readOnlyKey,
        value,
        context.orElseThrow(() -> new IllegalStateException("Not initialized"))
    );
  }
@Test
  public void shouldReturnValueFromInnerTransformer() {
    // When:
    final String result = ksTransformer.transform(KEY, VALUE);

    // Then:
    assertThat(result, is(RESULT));
  }