assertWithMessage("population covariance of %s", values).that(populationCovariance).isNaN();
        assertWithMessage("population covariance by addAll(PairedStats) of %s", values)
            .that(populationCovarianceByAddAllPartitionedPairedStats)
            .isNaN();
      } else {
        assertWithMessage("population covariance of %s", values)
            .that(populationCovariance)
            .isWithin(ALLOWED_ERROR)

 * {@code CharSink} is not an open, stateful stream that can be written to and closed. Instead, it
 * is an immutable <i>supplier</i> of {@code Writer} instances.
 *
 * <p>{@code CharSink} provides two kinds of methods:
 *
 * <ul>
 *   <li><b>Methods that return a writer:</b> These methods should return a <i>new</i>, independent
 *       instance each time they are called. The caller is responsible for ensuring that the
 *       returned writer is closed.

    if (object == this) {
      return true;
    }
    if (object instanceof ByFunctionOrdering) {
      ByFunctionOrdering<?, ?> that = (ByFunctionOrdering<?, ?>) object;
      return this.function.equals(that.function) && this.ordering.equals(that.ordering);
    }
    return false;
  }

  @Override
  public int hashCode() {
    return Objects.hash(function, ordering);
  }

  @Override

        // Test that custom sessionId is sanitized
        Crawler.Options options = new Crawler.Options();
        options.sessionId = "test-session-123";

        // Simulate what process() does - sanitize sessionId
        if (options.sessionId != null) {
            options.sessionId = options.sessionId.replaceAll("-", "_");
        }

        super.setUp(testInfo);
        fessLabels = new FessLabels();
    }

    /**
     * Test that assertPropertyNotNull throws exception for null input
     */
    @Test
    public void test_assertPropertyNotNull_withNull() {
        try {
            // Create a test instance that extends FessLabels
            TestFessLabels labels = new TestFessLabels();
            labels.testAssertPropertyNotNull(null);

   * Chooses and returns the representative instance for any of a collection of instances that are
   * equal to each other. If two {@linkplain Object#equals equal} inputs are given to this method,
   * both calls will return the same instance. That is, {@code intern(a).equals(a)} always holds,
   * and {@code intern(a) == intern(b)} if and only if {@code a.equals(b)}. Note that {@code

   */

  @Override
  public boolean equals(@Nullable Object object) {
    if (object instanceof Set) {
      Set<?> that = (Set<?>) object;
      return (this.size() == that.size()) && this.containsAll(that);
    }
    return false;
  }

  @Override
  public int hashCode() {
    int hashCodeSum = 0;
    for (Object o : this) {

   */

  @Override
  public boolean equals(@Nullable Object object) {
    if (object instanceof Set) {
      Set<?> that = (Set<?>) object;
      return (this.size() == that.size()) && this.containsAll(that);
    }
    return false;
  }

  @Override
  public int hashCode() {
    int hashCodeSum = 0;
    for (Object o : this) {

import com.google.common.annotations.GwtCompatible;
import java.util.Map;
import org.jspecify.annotations.Nullable;

/**
 * A {@link CharEscaper} that uses an array to quickly look up replacement characters for a given
 * {@code char} value. An additional safe range is provided that determines whether {@code char}
 * values without specific replacements are to be considered safe and left unescaped or should be
 * escaped in a general way.
 *

        continue;
      }
      assertWithMessage(
              "To help optimizers, any class that inherits a package-private writeReplace() method"
                  + " should override that method.\n"
                  + "(An override that delegates to the supermethod is fine.)\n"
                  + "%s has no such override despite inheriting writeReplace() from %s",