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() {

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

import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.artifact.resolver.filter.ExclusionSetFilter;
import org.apache.maven.extension.internal.CoreExports;

/**
 */
@Named
@Singleton
@Deprecated

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

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

import java.util.List;
import java.util.Map;
import java.util.Optional;

import org.apache.maven.api.services.Prompter;
import org.apache.maven.api.services.PrompterException;

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

import javax.inject.Named;
import javax.inject.Singleton;
import javax.xml.stream.XMLStreamException;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.file.Files;

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

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

import java.util.Arrays;
import java.util.List;

import org.apache.maven.artifact.UnknownRepositoryLayoutException;
import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;

 * under the License.
 */
package org.apache.maven.repository.legacy.resolver.transform;

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

import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.apache.maven.artifact.Artifact;

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

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

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

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

import java.lang.reflect.Method;
import java.util.List;

import org.apache.maven.api.services.Prompter;
import org.apache.maven.api.services.PrompterException;
import org.codehaus.plexus.PlexusContainer;

@Named
@Singleton
public class DefaultPrompter implements Prompter {

 */
package org.apache.maven.artifact.resolver;

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

/**
 * Artifact collector - takes a set of original artifacts and resolves all of the best versions to use
 * along with their metadata. No artifacts are downloaded.
 */
@Deprecated
@Named
@Singleton
public class DefaultArtifactCollector extends org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import static java.util.Collections.singleton;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.MapInterfaceTest;
import java.util.Collection;
import java.util.Map;

/**