void closeInternalThrowsButReleases() throws Exception {
        // Arrange
        stubAcquireReturnsSelf();
        FileEntry initial = entry("first");
        // Provide a page with no valid items so that advance returns null and triggers close in next()
        TestIterator it = TestIterator.create(tree, parent, "*", null, 0, initial, List.of(new FileEntry[][] { new FileEntry[] {} }))

   *
   * <p>May <a
   * href="http://download.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.html#Spurious">
   * fail spuriously</a> and does not provide ordering guarantees, so is only rarely an appropriate
   * alternative to {@code compareAndSet}.
   *
   * @param i the index
   * @param expect the expected value
   * @param update the new value

 * types, and also for interfaces and public classes that have public parameter-less constructors.
 * When the non-null default value for a particular parameter type cannot be provided by {@code
 * NullPointerTester}, the caller can provide a custom non-null default value for the parameter type
 * via {@link #setDefault}.
 *
 * @author Kevin Bourrillion
 * @since 10.0
 */
@GwtIncompatible
@J2ktIncompatible
@NullMarked

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