@CanIgnoreReturnValue
  public B withFeatures(Iterable<? extends Feature<?>> features) {
    for (Feature<?> feature : features) {
      this.features.add(feature);
    }
    return self();
  }

  public Set<Feature<?>> getFeatures() {
    return unmodifiableSet(features);
  }

  // Name

  private @Nullable String name;

  /** Configures this builder produce a TestSuite with the given name. */

import static com.google.common.collect.testing.features.FeatureUtil.getTesterAnnotations;
import static com.google.common.collect.testing.features.FeatureUtil.impliedFeatures;
import static com.google.common.collect.testing.features.FeatureUtilTest.ExampleFeature.BAR;
import static com.google.common.collect.testing.features.FeatureUtilTest.ExampleFeature.FOO;

# Advanced User Guide { #advanced-user-guide }

## Additional Features { #additional-features }

The main [Tutorial - User Guide](../tutorial/index.md) should be enough to give you a tour through all the main features of **FastAPI**.

In the next sections you will see other options, configurations, and additional features.

/// tip

The next sections are **not necessarily "advanced"**.

 */

package com.google.common.collect.testing.features;

import com.google.common.annotations.GwtCompatible;
import java.util.Set;

/**
 * Base class for enumerating the features of an interface to be tested.
 *
 * @param <T> The interface whose features are to be enumerated.
 * @author George van den Driessche
 */
@GwtCompatible
public interface Feature<T> {

### Properties of stable features

Properties of stable features MUST start with `org.gradle.<feature-name>.`

The qualifier is absent for these properties, making the name more concise.
This is a sensible default, as the majority of features are of this nature.

These properties MUST be stable.

        (TestMultisetGenerator<E>) parentBuilder.getSubjectGenerator();

    Set<Feature<?>> features = new HashSet<>();
    features.add(NoRecurse.SUBMULTISET);
    features.add(RESTRICTS_ELEMENTS);
    features.addAll(parentBuilder.getFeatures());

    if (!features.remove(SERIALIZABLE_INCLUDING_VIEWS)) {
      features.remove(SERIALIZABLE);
    }

import static com.google.common.collect.testing.features.FeatureUtil.addImpliedFeatures;
import static java.util.Arrays.asList;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.Feature;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

    List<Feature<?>> features = new ArrayList<>(parentBuilder.getFeatures());
    Set<Method> suppressing = new HashSet<>(parentBuilder.getSuppressedTests());
    features.add(CollectionFeature.SUBSET_VIEW);
    if (features.remove(CollectionFeature.ALLOWS_NULL_VALUES)) {
      // the null value might be out of bounds, so we can't always construct a subset with nulls
      features.add(CollectionFeature.ALLOWS_NULL_QUERIES);

    List<Feature<?>> features = new ArrayList<>(parentBuilder.getFeatures());
    Set<Method> suppressing = new HashSet<>(parentBuilder.getSuppressedTests());
    features.add(CollectionFeature.SUBSET_VIEW);
    if (features.remove(CollectionFeature.ALLOWS_NULL_VALUES)) {
      // the null value might be out of bounds, so we can't always construct a subset with nulls
      features.add(CollectionFeature.ALLOWS_NULL_QUERIES);

  /**
   * For documenting collections that support no optional features, such as {@link
   * java.util.Collections#emptySet}
   */
  NONE;

  private final Set<Feature<? super Collection>> implied;

  CollectionFeature(Feature<? super Collection>... implied) {
    this.implied = copyToSet(implied);
  }

  @Override
  public Set<Feature<? super Collection>> getImpliedFeatures() {
    return implied;
  }