import java.util.ArrayList;
import java.util.List;

import org.codelibs.fess.unit.UnitFessTestCase;

public class SchedulerPagerTest extends UnitFessTestCase {

    public void test_SchedulerPager() {
        SchedulerPager schedulerPager = new SchedulerPager();

        schedulerPager.clear();
        assertEquals(0, schedulerPager.getAllRecordCount());
        assertEquals(0, schedulerPager.getAllPageCount());

                    this.witnessClient = null;
                    this.witnessEnabled = false;
                }

                // Clear trees collection atomically
                if (this.trees != null) {
                    this.trees.clear();
                }
            }
        } else if (usage < 0) {
            throw new RuntimeCIFSException("Usage count dropped below zero");
        }

(_Please use [discuss.codelibs.org](https://discuss.codelibs.org/c/FessEN/8) before filing a bug._)

**Describe the bug**
A clear and concise description of what the bug is.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**

import org.codelibs.fess.unit.UnitFessTestCase;
import org.junit.jupiter.api.Test;

public class DocMapTest extends UnitFessTestCase {
    @Test
    public void test_DocList() {
        Map<String, Object> value = new LinkedHashMap<>();
        DocMap docMap = new DocMap(value);
        assertTrue(docMap.isEmpty());
        value.clear();

        List<String> keys = Arrays.asList("test_2", "test_0", "lang", "test_1");

      if (record != null) {
        list.add(record);
      }
    }
  }

  @Override
  public void flush() {}

  @Override
  public void close() {}

  public void clear() {
    synchronized (lock) {
      list.clear();
    }
  }

  /** Returns a snapshot of the logged records. */
  /*
   * TODO(cpovirk): consider higher-level APIs here (say, assertNoRecordsLogged(),

    return Iterables.removeIf(
        multimap.unfiltered().entries(),
        and(multimap.entryPredicate(), valuePredicateOnEntries(not(in(c)))));
  }

  @Override
  public void clear() {
    multimap.clear();
  }

import java.util.ArrayList;
import java.util.List;

import org.codelibs.fess.unit.UnitFessTestCase;

public class GroupPagerTest extends UnitFessTestCase {

    public void test_GroupPager() {
        GroupPager groupPager = new GroupPager();

        groupPager.clear();
        assertEquals(0, groupPager.getAllRecordCount());
        assertEquals(0, groupPager.getAllPageCount());

import java.util.ArrayList;
import java.util.List;

import org.codelibs.fess.unit.UnitFessTestCase;

public class PathMapPagerTest extends UnitFessTestCase {

    public void test_PathMapPager() {
        PathMapPager pathMapPager = new PathMapPager();

        pathMapPager.clear();
        assertEquals(0, pathMapPager.getAllRecordCount());
        assertEquals(0, pathMapPager.getAllPageCount());

    table.put("b", "b", "x");
    table.put("b", "c", "y");
    table.put("b", "x", "n");
    table.put("a", "a", "d");
    table.row("b").subMap("c", "x").clear();
    assertEquals(table.row("b"), ImmutableMap.of("b", "x", "x", "n"));
    table.row("b").subMap("b", "y").clear();
    assertEquals(table.row("b"), ImmutableMap.of());
    assertFalse(table.backingMap.containsKey("b"));
  }

    @Override
    public @Nullable V remove(Object object) {
      assertTrue(Thread.holdsLock(mutex));
      return super.remove(object);
    }

    @Override
    public void clear() {
      assertTrue(Thread.holdsLock(mutex));
      super.clear();
    }

    @Override
    public boolean containsKey(Object key) {
      assertTrue(Thread.holdsLock(mutex));
      return super.containsKey(key);
    }

    @Override