enemies = Sets.newHashSet("Dick", "Harry", "Tom");
  }

  public void testUnion() {
    Set<String> all = Sets.union(friends, enemies);
    assertEquals(5, all.size());

    ImmutableSet<String> immut = Sets.union(friends, enemies).immutableCopy();
    HashSet<String> mut = Sets.union(friends, enemies).copyInto(new HashSet<String>());

    enemies.add("Buck");
    assertEquals(6, all.size());

    enemies = Sets.newHashSet("Dick", "Harry", "Tom");
  }

  public void testUnion() {
    Set<String> all = Sets.union(friends, enemies);
    assertEquals(5, all.size());

    ImmutableSet<String> immut = Sets.union(friends, enemies).immutableCopy();
    HashSet<String> mut = Sets.union(friends, enemies).copyInto(new HashSet<String>());

    enemies.add("Buck");
    assertEquals(6, all.size());

    assertThat(Multisets.union(ms1, ms2)).containsExactly("a", "a", "b", "b", "c");
  }

  public void testUnionEqualMultisets() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertEquals(ms1, Multisets.union(ms1, ms2));
  }

  public void testUnionEmptyNonempty() {

import static org.eclipse.aether.impl.scope.BuildScopeQuery.select;
import static org.eclipse.aether.impl.scope.BuildScopeQuery.singleton;
import static org.eclipse.aether.impl.scope.BuildScopeQuery.union;

/**
 * Maven4 scope configurations. Configures scope manager to support Maven4 scopes.
 * <p>
 * This manager supports all the new Maven 4 dependency scopes defined in {@link DependencyScope}.
 *
 * @since 2.0.0

import static org.eclipse.aether.impl.scope.BuildScopeQuery.select;
import static org.eclipse.aether.impl.scope.BuildScopeQuery.singleton;
import static org.eclipse.aether.impl.scope.BuildScopeQuery.union;

/**
 * Maven3 scope configurations. Configures scope manager to support Maven3 scopes.
 * <p>
 * This manager supports the old Maven 3 dependency scopes.
 *
 * @since 2.0.0
 */

  //
  // Element-level accessors
  //

  /**
   * Returns a live view of the nodes which have an incident edge in common with {@code node} in
   * this graph.
   *
   * <p>This is equal to the union of {@link #predecessors(Object)} and {@link #successors(Object)}.
   *
   * <p>If {@code node} is removed from the graph after this method is called, the {@code Set}

    return result;
  }

  /**
   * Returns a new range set consisting of the union of this range set and {@code other}.
   *
   * <p>This is essentially the same as {@code TreeRangeSet.create(this).addAll(other)} except it
   * returns an {@code ImmutableRangeSet}.
   *
   * @since 21.0
   */
  public ImmutableRangeSet<C> union(RangeSet<C> other) {
    return unionOf(Iterables.concat(asRanges(), other.asRanges()));
  }

    return result;
  }

  /**
   * Returns a new range set consisting of the union of this range set and {@code other}.
   *
   * <p>This is essentially the same as {@code TreeRangeSet.create(this).addAll(other)} except it
   * returns an {@code ImmutableRangeSet}.
   *
   * @since 21.0
   */
  public ImmutableRangeSet<C> union(RangeSet<C> other) {
    return unionOf(Iterables.concat(asRanges(), other.asRanges()));
  }

    assertThat(Multisets.union(ms1, ms2)).containsExactly("a", "a", "b", "b", "c");
  }

  public void testUnionEqualMultisets() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertEquals(ms1, Multisets.union(ms1, ms2));
  }

  public void testUnionEmptyNonempty() {

     */
    DependencyNode getDependencyGraph();

    /**
     * Gets the transitive dependencies of the project that were not excluded by
     * {@link DependencyResolutionRequest#getResolutionFilter()}. This list is a union of the results from
     * {@link #getResolvedDependencies()} and {@link #getUnresolvedDependencies()}.
     *
     * @return The transitive dependencies, never {@code null}.
     */
    List<Dependency> getDependencies();