*/
    @Test
    public void testEntrySet() throws Exception {
        Iterator<Map.Entry<String, String>> i = map.entrySet().iterator();
        assertThat(i.next().getKey(), is(nullValue()));
        assertThat(i.next().getKey(), is("1"));
        assertThat(i.next().getKey(), is("2"));
    }

    /**
     * Test method for {@link org.seasar.util.collection.ArrayIterator#remove()}
     * .
     */
    @Test

// Tokens; original spacing is lost but we don't need it.
type TokenReader interface {
	// Next returns the next token.
	Next() ScanToken
	// The following methods all refer to the most recent token returned by Next.
	// Text returns the original string representation of the token.
	Text() string
	// File reports the source file name of the token.
	File() string

    /**
     * Moves the result set to the next position.
     *
     * @param resultSet
     *            The result set. Must not be {@literal null}.
     * @return Whether the result set successfully moved to the next position.
     */
    public static boolean next(final ResultSet resultSet) {
        assertArgumentNotNull("resultSet", resultSet);

        try {
            return resultSet.next();
        } catch (final SQLException ex) {

        }

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

        @Override
        public String next() {
            lastLineNumber++;
            return delegate.next();
        }
    }

    }

    /**
     * Checks if a next page exists.
     *
     * @return true if a next page exists, false otherwise
     */
    public boolean isExistNextPage() {
        return existNextPage;
    }

    /**
     * Sets whether a next page exists.
     *
     * @param existNextPage true if a next page exists, false otherwise
     */

      final Runnable runnable;
      final Executor executor;
      @Nullable final RunnableExecutorPair next;

      RunnableExecutorPair(Runnable runnable, Executor executor, RunnableExecutorPair next) {
        this.runnable = runnable;
        this.executor = executor;
        this.next = next;
      }
    }
  }

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

     */
    boolean enter(@Nonnull Node node);

    /**
     * Ends the visit to the specified dependency node.
     *
     * @param node the dependency node to visit
     * @return <code>true</code> to visit the specified dependency node's next sibling, <code>false</code> to skip the
     *         specified dependency node's next siblings and proceed to its parent
     */

    assertEquals(immutableEntry("foo", 5), entryIterator.next());
    assertEquals(immutableEntry("bar", 4), entryIterator.next());
    assertEquals(immutableEntry("foo", 3), entryIterator.next());
    assertEquals(immutableEntry("cow", 2), entryIterator.next());
    assertEquals(immutableEntry("bar", 1), entryIterator.next());

    Iterator<Entry<String, Collection<Integer>>> collectionIterator =

        }

        @Test
        @DisplayName("Should return next referral data")
        void testNext() {
            // Test with mock
            when(mockReferralData.next()).thenReturn(mockReferralData);
            DfsReferralDataInternal next = mockReferralData.next();
            assertSame(mockReferralData, next);
            verify(mockReferralData, times(1)).next();

            // Test with concrete implementation