}

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAll_supportedNothing() {
    getMap().putAll(emptyMap());
    expectUnchanged();
  }

  @MapFeature.Require(absent = SUPPORTS_PUT)
  public void testPutAll_unsupportedNothing() {
    try {
      getMap().putAll(emptyMap());
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

    }

    static <K, V> Map<K, V> copy(Map<K, V> map) {
        if (map == null) {
            return emptyMap();
        } else if (map instanceof AbstractImmutableMap) {
            return map;
        } else {
            switch (map.size()) {
                case 0:
                    return emptyMap();
                case 1:
                    Map.Entry<K, V> entry = map.entrySet().iterator().next();

    private List<String> inactiveProfileIds = Collections.emptyList();

    private Map<String, String> systemProperties = Collections.emptyMap();

    private Map<String, String> userProperties = Collections.emptyMap();

    private Map<String, String> projectProperties = Collections.emptyMap();

    private File projectDirectory;

    @Override
    public List<String> getActiveProfileIds() {
        return activeProfileIds;

                aetherRepositorySystem,
                eventSpyDispatcher,
                information,
                defaultTypeRegistry,
                versionScheme,
                Collections.emptyMap());

        MavenExecutionRequest request = new DefaultMavenExecutionRequest();
        request.setLocalRepository(getLocalRepository());
        assertNull(systemSessionFactory.newRepositorySession(request).getUpdatePolicy());

 */

package com.google.common.collect;

import static com.google.common.collect.Maps.immutableEntry;
import static com.google.common.truth.Truth.assertThat;
import static java.util.Collections.emptyMap;
import static java.util.Collections.singletonMap;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.SampleElements;

    assertEquals(emptyMap(), map);
  }

  public void testConcurrentMap() {
    ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
    assertEquals(emptyMap(), map);
  }

  public void testTreeMap() {
    TreeMap<Integer, Integer> map = Maps.newTreeMap();
    assertEquals(emptyMap(), map);
    assertThat(map.comparator()).isNull();
  }

    @Override
    public List<String> findVersions(Artifact artifact) {
        List<String> versions = getProjects()
                .getOrDefault(artifact.getGroupId(), Collections.emptyMap())
                .getOrDefault(artifact.getArtifactId(), Collections.emptyMap())
                .values()
                .stream()
                .map(MavenProject::getVersion)

        public void mergeModelBase(ModelBase target, ModelBase source) {
            mergeModelBase(target, source, true, Collections.emptyMap());
        }

        public void mergeBuildBase(BuildBase target, BuildBase source) {
            mergeBuildBase(target, source, true, Collections.emptyMap());
        }

        @Override
        protected void mergePluginContainer_Plugins(

    assertEquals(emptyMap(), map);
  }

  public void testConcurrentMap() {
    ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
    assertEquals(emptyMap(), map);
  }

  public void testTreeMap() {
    TreeMap<Integer, Integer> map = Maps.newTreeMap();
    assertEquals(emptyMap(), map);
    assertThat(map.comparator()).isNull();
  }

  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAll_supportedNothing() {
    getMap().putAll(emptyMap());
    expectUnchanged();
  }

  @MapFeature.Require(absent = SUPPORTS_PUT)
  public void testPutAll_unsupportedNothing() {
    try {
      getMap().putAll(emptyMap());
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }