assertEquals("newValue", docMap.put("newKey", "updatedValue"));
        assertEquals("updatedValue", docMap.get("newKey"));

        assertNull(docMap.get("nonexistent"));
    }

    public void test_remove() {
        Map<String, Object> parentMap = new HashMap<>();
        DocMap docMap = new DocMap(parentMap);

        docMap.put("key1", "value1");
        docMap.put("key2", "value2");

     */
    @Test
    public void testRemove() throws Exception {
        assertThat(map.remove("1"), is("test"));
        assertThat(map.size(), is(2));
        assertThat(map.remove("dummy"), is(nullValue()));
        assertThat(map.remove(0), is(nullValue()));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testRemove2() throws Exception {

/**
 * Tests for UnmodifiableListIterator.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullMarked
public class UnmodifiableListIteratorTest extends TestCase {
  @SuppressWarnings("DoNotCall")
  public void testRemove() {
    Iterator<String> iterator = create();

    assertTrue(iterator.hasNext());
    assertEquals("a", iterator.next());
    assertThrows(UnsupportedOperationException.class, () -> iterator.remove());
  }

   * of a call to {@code remove()}. Thus, the expectation doesn't hold that {@code map.remove(x)}
   * returns the same value which {@code map.get(x)} did immediately beforehand.
   */
  @Override
  public void testRemove() {
    Map<String, Collection<Integer>> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return;
    }
    String keyToRemove = map.keySet().iterator().next();

        assertThat(emptyIterator, is(notNullValue()));
    }

    /**
     * Test method for {@link org.codelibs.core.collection.EmptyIterator#remove()}
     * .
     */
    @Test
    public void testRemove() {
        exception.expect(ClUnsupportedOperationException.class);
        exception.expectMessage(is("remove"));
        final EmptyIterator<String> emptyIterator = new EmptyIterator<String>();

        assertThat(itr.hasNext(), is(true));
        itr.next();
        assertThat(itr.hasNext(), is(not(true)));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testRemove() throws Exception {
        exception.expect(ClUnsupportedOperationException.class);
        exception.expectMessage(is("remove"));
        final ArrayIterator<String> itr = new ArrayIterator<String>("1", "2");

/**
 * Tests for {@link UnmodifiableIterator}.
 *
 * @author Jared Levy
 */
@GwtCompatible
@NullMarked
public class UnmodifiableIteratorTest extends TestCase {

  @SuppressWarnings("DoNotCall")
  public void testRemove() {
    String[] array = {"a", "b", "c"};

    Iterator<String> iterator =
        new UnmodifiableIterator<String>() {
          int i;

          @Override
          public boolean hasNext() {

   */

  public void testSize() {
    int unused = create().size();
  }

  public void testIsEmpty() {
    boolean unused = create().isEmpty();
  }

  public void testRemove() {
    create().remove(null);
  }

  public void testClear() {
    create().clear();
  }

  public void testContainsKey() {
    boolean unused = create().containsKey(null);
  }

    assertEquals((Character) 'c', table.get("foo", 3));
    assertEquals((Character) 'e', table.get("bar", 2));
    assertEquals((Character) 'f', table.get("cat", 2));
    assertSize(5);
  }

  public void testRemove() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    if (supportsRemove()) {
      assertNull(table.remove("cat", 1));
      assertNull(table.remove("bar", 3));
      assertEquals(3, table.size());

    assertEquals((Character) 'c', table.get("foo", 3));
    assertEquals((Character) 'e', table.get("bar", 2));
    assertEquals((Character) 'f', table.get("cat", 2));
    assertSize(5);
  }

  public void testRemove() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    if (supportsRemove()) {
      assertNull(table.remove("cat", 1));
      assertNull(table.remove("bar", 3));
      assertEquals(3, table.size());