}

  public void testIsEmpty_iterable() {
    List<Object> list = new ArrayList<>();
    assertEmpty(list);
    assertEmpty(() -> emptyIterator());

    list.add("a");
    try {
      assertEmpty(list);
      throw new Error();
    } catch (AssertionFailedError expected) {
    }
    try {
      assertEmpty(
          new Iterable<String>() {
            @Override
            public Iterator<String> iterator() {

  }

  public void testIsEmpty_iterable() {
    List<Object> list = new ArrayList<>();
    assertEmpty(list);
    assertEmpty(() -> emptyIterator());

    list.add("a");
    try {
      assertEmpty(list);
      throw new Error();
    } catch (AssertionFailedError expected) {
    }
    try {
      assertEmpty(
          new Iterable<String>() {
            @Override
            public Iterator<String> iterator() {

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.Helpers.assertEmpty;
import static com.google.common.collect.testing.Helpers.copyToList;
import static com.google.common.collect.testing.Helpers.getMethod;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.Helpers.assertEmpty;
import static com.google.common.collect.testing.Helpers.copyToList;
import static com.google.common.collect.testing.Helpers.getMethod;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;

        ? ((Collection<?>) iterable).isEmpty()
        : !iterable.iterator().hasNext();
  }

  public static void assertEmpty(Iterable<?> iterable) {
    if (!isEmpty(iterable)) {
      fail("Not true that " + iterable + " is empty");
    }
  }

  public static void assertEmpty(Map<?, ?> map) {
    if (!map.isEmpty()) {
      fail("Not true that " + map + " is empty");
    }
  }

    Set<Integer> mt = emptySet();
    assertEmpty(cartesianProduct(mt, mt));
  }

  public void testCartesianProduct_binary0x1() {
    Set<Integer> mt = emptySet();
    assertEmpty(cartesianProduct(mt, set(1)));
  }

  public void testCartesianProduct_binary1x0() {
    Set<Integer> mt = emptySet();
    assertEmpty(cartesianProduct(set(1), mt));
  }