errorsField.setAccessible(true);
            @SuppressWarnings("unchecked")
            Queue<String> errors = (Queue<String>) errorsField.get(null);
            assertTrue(errors.isEmpty());
        } catch (Exception e) {
            fail("Failed to access errors field: " + e.getMessage());
        }
    }

    public void test_addError_withEmptyMessage() {
        Crawler.addError("");

            return this;
        }

        public DependencyCoordinatesFactoryRequestBuilder exclusions(Collection<Exclusion> exclusions) {
            if (exclusions != null) {
                if (this.exclusions.isEmpty()) {
                    this.exclusions = new ArrayList<>();
                }
                this.exclusions.addAll(exclusions);
            }
            return this;
        }

   */
  public int size() {
    return map.size();
  }

  /** Returns {@code true} if this map contains no key-value mappings. */
  public boolean isEmpty() {
    return map.isEmpty();
  }

  /**
   * Removes all of the mappings from this map. The map will be empty after this call returns.
   *

        writeShort(0) // answerCount
        writeShort(0) // authorityResourceCount
        writeShort(0) // additional

        val nameBuf = Buffer()
        val labels = host.split('.').dropLastWhile { it.isEmpty() }
        for (label in labels) {
          val utf8ByteCount = label.utf8Size()
          require(utf8ByteCount == label.length.toLong()) { "non-ascii hostname: $host" }
          nameBuf.writeByte(utf8ByteCount.toInt())

import static java.text.DateFormat.LONG;
import static java.text.DateFormat.MEDIUM;
import static java.text.DateFormat.SHORT;
import static java.text.DateFormat.getTimeInstance;
import static org.codelibs.core.lang.StringUtil.isEmpty;
import static org.codelibs.core.lang.StringUtil.isNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.sql.Time;
import java.text.DateFormat;
import java.text.ParsePosition;

import static java.text.DateFormat.LONG;
import static java.text.DateFormat.MEDIUM;
import static java.text.DateFormat.SHORT;
import static java.text.DateFormat.getDateTimeInstance;
import static org.codelibs.core.lang.StringUtil.isEmpty;
import static org.codelibs.core.lang.StringUtil.isNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.sql.Timestamp;
import java.text.DateFormat;

          postponedRoutes += route
        } else {
          routes += route
        }
      }

      if (routes.isNotEmpty()) {
        break
      }
    }

    if (routes.isEmpty()) {
      // We've exhausted all Proxies so fallback to the postponed routes.
      routes += postponedRoutes
      postponedRoutes.clear()
    }

    return Selection(routes)
  }

  }

  @Override
  public @Nullable K higherKey(K key) {
    return delegate.higherKey(checkValid(key));
  }

  @Override
  public boolean isEmpty() {
    return delegate.isEmpty();
  }

  @Override
  public NavigableSet<K> keySet() {
    return navigableKeySet();
  }

  @Override
  public @Nullable Entry<K, V> lastEntry() {

    assertEquals(ImmutableMap.of("two", 2, "four", 4), filtered);

    filtered.clear();
    assertEquals(ImmutableMap.of("one", 1, "three", 3), unfiltered);
    assertTrue(filtered.isEmpty());
  }

  public void testFilteredEntriesIllegalPut() {
    Map<String, Integer> unfiltered = createUnfiltered();
    unfiltered.put("cat", 3);
    unfiltered.put("dog", 2);
    unfiltered.put("horse", 5);

    assertNull(table.get(null, 1));
    assertNull(table.get(null, null));
  }

  public void testIsEmpty() {
    assertTrue(table.isEmpty());
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    assertFalse(table.isEmpty());
  }

  public void testSize() {
    assertSize(0);
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    assertSize(3);
  }