MavenSession m1 = new MavenSession(null, null, mavenExecutionRequest, null);
        defaultLegacySupport.setSession(m1);

        MyRunnable myRunnable = new MyRunnable();
        Thread thread = new Thread(myRunnable);
        thread.start();

        MavenSession m2 = new MavenSession(null, null, mavenExecutionRequest, null);
        defaultLegacySupport.setSession(m2);
        latch.countDown();

        if (a.getVersion() != null) {
            result = 31 * result + a.getVersion().hashCode();
        }
        result = 31 * result + (a.getClassifier() != null ? a.getClassifier().hashCode() : 0);
        result = 31 * result + (a.getScope() != null ? a.getScope().hashCode() : 0);
        result = 31 * result
                + (a.getDependencyFilter() != null ? a.getDependencyFilter().hashCode() : 0);

    graph.putEdgeValue(4, 4, "valueD");

    assertThat(graph.edgeValueOrDefault(1, 2, null)).isEqualTo("valueA");
    assertThat(graph.edgeValueOrDefault(2, 1, null)).isEqualTo("valueB");
    assertThat(graph.edgeValueOrDefault(2, 3, null)).isEqualTo("valueC");
    assertThat(graph.edgeValueOrDefault(4, 4, null)).isEqualTo("valueD");
    assertThat(graph.edgeValueOrDefault(1, 2, DEFAULT)).isEqualTo("valueA");

        LifecycleMapping lifecycleMapping =
                lookup.lookupOptional(LifecycleMapping.class, id).orElse(null);
        if (lifecycleMapping == null) {
            return Optional.empty();
        }
        Type type = typeRegistry.lookup(id).orElse(null);
        if (type == null) {
            return Optional.empty();
        }

      monitor.leave();
    }
  }

  /**
   * Returns the comparator used to order the elements in this queue, or {@code null} if this queue
   * uses the {@linkplain Comparable natural ordering} of its elements.
   *
   * @return the comparator used to order the elements in this queue, or {@code null} if this queue
   *     uses the natural ordering of its elements
   */
  @CanIgnoreReturnValue // pushed down from class to method

import org.apache.maven.api.xml.XmlNode;
import org.apache.maven.internal.xml.XmlNodeBuilder;
import org.codehaus.plexus.util.xml.Xpp3Dom;
import org.codehaus.plexus.util.xml.pull.MXParser;
import org.codehaus.plexus.util.xml.pull.XmlPullParser;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
import org.eclipse.sisu.Priority;
import org.eclipse.sisu.bean.BeanProperties;
import org.eclipse.sisu.bean.BeanProperty;

    Predicate<@Nullable Integer> isNull = Predicates.equalTo(null);
    assertTrue(isNull.apply(null));
    assertFalse(isNull.apply(1));
  }

  public void testIsEqualToNull_equality() {
    new EqualsTester()
        .addEqualityGroup(
            Predicates.<@Nullable Integer>equalTo(null),
            Predicates.<@Nullable Integer>equalTo(null))
        .addEqualityGroup(Predicates.equalTo(1))

        if (dominant == null || recessive == null) {
            return;
        }

        recessive.setSourceLevel(recessiveSourceLevel);

        List<String> dominantActiveProfiles = dominant.getActiveProfiles();
        List<String> recessiveActiveProfiles = recessive.getActiveProfiles();

        if (recessiveActiveProfiles != null) {
            if (dominantActiveProfiles == null) {

   *
   * <p>Example:
   *
   * {@snippet :
   * Ordering.allEqual().nullsLast().sortedCopy(
   *     asList(t, null, e, s, null, t, null))
   * }
   *
   * <p>Assuming {@code t}, {@code e} and {@code s} are non-null, this returns {@code [t, e, s, t,
   * null, null, null]} regardless of the true comparison order of those three values (which might
   * not even implement {@link Comparable} at all).
   *

        .testEquals();
  }

  @AndroidIncompatible // Android forbids null parent ClassLoader
  public void testClassPathEntries_emptyURLClassLoader_noParent() {
    assertThat(ClassPath.getClassPathEntries(new URLClassLoader(new URL[0], null)).keySet())
        .isEmpty();
  }

  @AndroidIncompatible // Android forbids null parent ClassLoader
  public void testClassPathEntries_urlClassLoader_noParent() throws Exception {