.addEqualityGroup(
            singleton(1),
            union(singleton(1), singleton(1)),
            intersection(newHashSet(1, 2), newHashSet(1, 3)),
            difference(newHashSet(1, 2), newHashSet(2, 3)),
            symmetricDifference(newHashSet(1, 2, 3), newHashSet(2, 3)))
        .addEqualityGroup(
            singleton(2),
            union(singleton(2), singleton(2)),

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;

import java.util.List;
import java.util.Properties;

import org.apache.maven.model.Build;
import org.apache.maven.project.MavenProject;
import org.junit.jupiter.api.Test;

import static java.util.Collections.singleton;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

class DefaultBuildResumptionDataRepositoryTest {

    Collection<String> c = MinimalCollection.of("a");
    Set<String> set = copyOf(c);
    assertEquals(singleton("a"), set);
  }

  public void testCopyOf_collection_oneElementRepeated() {
    Collection<String> c = MinimalCollection.of("a", "a", "a");
    Set<String> set = copyOf(c);
    assertEquals(singleton("a"), set);
  }

  public void testCopyOf_collection_general() {

package org.apache.maven.extension.internal;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;
import javax.inject.Singleton;

import java.util.Objects;

import org.apache.maven.internal.CoreRealm;

/**
 * CoreExportsProvider
 */
@Named
@Singleton
public class CoreExportsProvider implements Provider<CoreExports> {

    private final CoreExports exports;

    @Inject

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.project;

import javax.inject.Named;
import javax.inject.Singleton;

import java.io.FileNotFoundException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

 */
package org.apache.maven.lifecycle;

import javax.inject.Named;
import javax.inject.Singleton;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import org.apache.maven.execution.ProjectExecutionEvent;
import org.apache.maven.execution.ProjectExecutionListener;

@Named
@Singleton
public class DelegatingProjectExecutionListener implements ProjectExecutionListener {

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.toolchain;

import javax.inject.Named;
import javax.inject.Singleton;

import java.io.File;
import java.io.InputStream;
import java.nio.file.Files;

import org.apache.maven.toolchain.model.PersistedToolchains;
import org.apache.maven.toolchain.v4.MavenToolchainsStaxReader;

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.project.validation;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.model.Model;
import org.apache.maven.model.building.DefaultModelBuildingRequest;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblem;

import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.artifact.resolver.ResolutionNode;

/**
 * Resolves conflicting artifacts by always selecting the nearest declaration. Nearest is defined as the
 * declaration that has the least transitive steps away from the project being built.
 *
 * @since 3.0
 */
@Named("nearest")
@Singleton
@Deprecated