iterable.forEach(t -> forEachBuilder.append(t.value));
    assertTrue(
        "Iterator content was " + builder + " but forEach content was " + forEachBuilder,
        builder.toString().contentEquals(forEachBuilder));
    return builder.toString();
  }

  public void testPreOrder() {
    assertThat(iterationOrder(ADAPTER.preOrderTraversal(h))).isEqualTo("hdabcegf");
  }

  public void testPostOrder() {

  val result = Headers.Builder()
  result.namesAndValues += namesAndValues
  return result
}

internal fun Headers.commonEquals(other: Any?): Boolean {
  return other is Headers && namesAndValues.contentEquals(other.namesAndValues)
}

internal fun Headers.commonHashCode(): Int = namesAndValues.contentHashCode()

internal fun Headers.commonToString(): String {
  return buildString {
    for (i in 0 until size) {

      System.setProperty(PATH_SEPARATOR.key(), oldPathSeparator);
      System.setProperty(JAVA_CLASS_PATH.key(), oldClassPath);
    }
  }

  private static boolean contentEquals(URL left, URL right) throws IOException {
    return Resources.asByteSource(left).contentEquals(Resources.asByteSource(right));
  }

  private static class Nested {}


  public void testNulls() throws IOException {

      assertThat(MoreFiles.equal(fooPath, barPath)).isFalse();
      assertThat(MoreFiles.equal(fooPath, fooPath)).isTrue();
      assertThat(MoreFiles.asByteSource(fooPath).contentEquals(MoreFiles.asByteSource(fooPath)))
          .isTrue();

      Path fooCopy = Files.copy(fooPath, fs.getPath("fooCopy"));
      assertThat(Files.isSameFile(fooPath, fooCopy)).isFalse();

static String[] getFilesFromExtensio(String, String[]); private static java.util.Vector blendFilesToVector(java.util.Vector, String[]); private static boolean isValidFile(String, String[]); public static void mkdir(String); public static boolean contentEquals(java.io.File, java.io.File) throws java.io.IOException; public static java.io.File toFile(java.net.URL); public static java.net.URL[] toURLs(java.io.File[]) throws java.io.IOException; public static String removeExtension(String); public static...

     * directly.
     */
    long len1 = file1.length();
    long len2 = file2.length();
    if (len1 != 0 && len2 != 0 && len1 != len2) {
      return false;
    }
    return asByteSource(file1).contentEquals(asByteSource(file2));
  }

  /**
   * Atomically creates a new directory somewhere beneath the system's temporary directory (as
   * defined by the {@code java.io.tmpdir} system property), and returns its name.