*     operation is done
   */
  public void finishToValueAndCloser(
      ValueAndCloserConsumer<? super V> consumer, Executor executor) {
    checkNotNull(consumer);
    if (!compareAndUpdateState(OPEN, WILL_CREATE_VALUE_AND_CLOSER)) {
      switch (state.get()) {
        case SUBSUMED:
          throw new IllegalStateException(
              "Cannot call finishToValueAndCloser() after deriving another step");

   *     operation is done
   */
  public void finishToValueAndCloser(
      ValueAndCloserConsumer<? super V> consumer, Executor executor) {
    checkNotNull(consumer);
    if (!compareAndUpdateState(OPEN, WILL_CREATE_VALUE_AND_CLOSER)) {
      switch (state.get()) {
        case SUBSUMED:
          throw new IllegalStateException(
              "Cannot call finishToValueAndCloser() after deriving another step");

import org.jspecify.annotations.NullUnmarked;
import org.mockito.Mockito;

/**
 * Tests for {@link ClosingFuture}. Subclasses exercise either the {@link
 * ClosingFuture#finishToFuture()} or {@link
 * ClosingFuture#finishToValueAndCloser(ValueAndCloserConsumer, Executor)} paths to complete a
 * {@link ClosingFuture} pipeline.
 */
@NullUnmarked
public abstract class AbstractClosingFutureTest extends TestCase {