Attr attr = element.attributes.item(i)
                target.append(" $attr.name=\"$attr.value\"")
            }

            element.childNodes.findAll { it instanceof Text }.each {
                assert it.textContent != null : "Found null text element in <$element.tagName>"
            }

            List<Node> trimmedContent = element.childNodes.collect { it };

import static com.google.common.io.SourceSinkFactory.ByteSinkFactory;
import static com.google.common.io.SourceSinkFactory.CharSinkFactory;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertArrayEquals;

import com.google.common.collect.ImmutableList;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;

  @SuppressWarnings("UseCorrectAssertInTests") // TODO(b/345814817): Remove or convert assertion.
  private static BigInteger oldSlowFactorial(int n1, int n2) {
    assert n1 <= n2;
    if (IntMath.log2(n2, CEILING) * (n2 - n1) < Long.SIZE - 1) {
      // the result will definitely fit into a long
      long result = 1;
      for (int i = n1 + 1; i <= n2; i++) {
        result *= i;
      }

import static com.google.common.io.SourceSinkFactory.ByteSinkFactory;
import static com.google.common.io.SourceSinkFactory.CharSinkFactory;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertArrayEquals;

import com.google.common.collect.ImmutableList;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;

 * limitations under the License.
 */

package com.google.common.util.concurrent;

import static com.google.common.truth.Truth.assertThat;
import static java.util.concurrent.TimeUnit.MINUTES;
import static org.junit.Assert.assertThrows;

import com.google.common.base.Joiner;
import com.google.common.util.concurrent.CycleDetectingLockFactory.Policies;
import com.google.common.util.concurrent.CycleDetectingLockFactory.Policy;

 * limitations under the License.
 */

package com.google.common.util.concurrent;

import static com.google.common.truth.Truth.assertThat;
import static java.util.concurrent.TimeUnit.MINUTES;
import static org.junit.Assert.assertThrows;

import com.google.common.base.Joiner;
import com.google.common.util.concurrent.CycleDetectingLockFactory.Policies;
import com.google.common.util.concurrent.CycleDetectingLockFactory.Policy;

 * the License.
 */

package com.google.common.util.concurrent.testing;

import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertThrows;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CountDownLatch;

 * limitations under the License.
 */

package com.google.common.reflect;

import static com.google.common.collect.Maps.immutableEntry;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.SampleElements;

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.Lists;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeoutException;
import junit.framework.TestCase;

/**

 * limitations under the License.
 */

package com.google.common.util.concurrent;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import com.google.common.testing.NullPointerTester;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.Locale;
import java.util.concurrent.Executors;