*/
@GwtCompatible
@NullMarked
public class UnmodifiableCollectionTests {

  public static void assertMapEntryIsUnmodifiable(Entry<?, ?> entry) {
    try {
      // fine because the call is going to fail without modifying the entry
      @SuppressWarnings("unchecked")
      Entry<?, @Nullable Object> nullableValueEntry = (Entry<?, @Nullable Object>) entry;
      nullableValueEntry.setValue(null);

    try {
      recurse(0);
    } catch (Exception e) { // sneaky checked exception
      throw new RuntimeException(Arrays.toString(stimuli), e);
    }
  }

  private void recurse(int level) {
    // We're going to reuse the stimuli array 3^steps times by overwriting it
    // in a recursive loop.  Sneaky.
    if (level == stimuli.length) {
      // We've filled the array.
      compareResultsForThisListOfStimuli();
    } else {

"siihen", "sillä", "siltä", "sille", "sinä", "siksi", "nämä", "näiden", "näitä", "näissä", "näistä", "näihin", "näillä", "näiltä", "näille", "näinä", "näiksi", "nuo", "noiden", "noita", "noissa", "noista", "noihin", "noilla", "noilta", "noille", "noina", "noiksi", "ne", "niiden", "niitä", "niissä", "niistä", "niihin", "niillä", "niiltä", "niille", "niinä", "niiksi", "kuka", "kenen", "kenet", "ketä", "kenessä", "kenestä", "keneen", "kenellä", "keneltä", "kenelle", "kenenä", "keneksi", "ketkä", "keiden",...

"siihen", "sillä", "siltä", "sille", "sinä", "siksi", "nämä", "näiden", "näitä", "näissä", "näistä", "näihin", "näillä", "näiltä", "näille", "näinä", "näiksi", "nuo", "noiden", "noita", "noissa", "noista", "noihin", "noilla", "noilta", "noille", "noina", "noiksi", "ne", "niiden", "niitä", "niissä", "niistä", "niihin", "niillä", "niiltä", "niille", "niinä", "niiksi", "kuka", "kenen", "kenet", "ketä", "kenessä", "kenestä", "keneen", "kenellä", "keneltä", "kenelle", "kenenä", "keneksi", "ketkä", "keiden",...

        assertEquals(expectedElements, targetElements);
      } else {
        assertEqualIgnoringOrder(expectedElements, targetElements);
      }
    }
  }

  private void recurse(int level) {
    // We're going to reuse the stimuli array 3^steps times by overwriting it
    // in a recursive loop.  Sneaky.
    if (level == stimuli.length) {
      // We've filled the array.
      compareResultsForThisListOfStimuli();
    } else {

       */
      ignoredMembers.add(Converter.class.getMethod("apply", Object.class));
    } catch (NoSuchMethodException shouldBeImpossible) {
      // Fine: If it doesn't exist, then there's no chance that we're going to be asked to test it.
    }

    /*
     * These methods "should" call checkNotNull. However, I'm wary of accidentally introducing

 *  New: Support for SOCKS proxies.
 *  New: Support for `TLS_FALLBACK_SCSV`.
 *  New: Update HTTP/2 support to `h2-16` and `hpack-10`.
 *  New: APIs to prevent retrying non-idempotent requests.
 *  Fix: Drop NPN support. Going forward we support ALPN only.
 *  Fix: The hostname verifier is now strict. This is consistent with the hostname
    verifier in modern browsers.
 *  Fix: Improve `CONNECT` handling for misbehaving HTTP proxies.

   * methods as implementations of normal converters do?
   *
   * But no matter what we do, it's worth remembering that the resulting code is going to be unsound
   * in the presence of LegacyConverter, at least in the case of users who view the converter as a
   * Function<A, B> or who call convertAll (and for any checkers that apply @PolyNull-like semantics

   *     {@code off + len} is greater than {@code b.length}
   */
  @CanIgnoreReturnValue
  // Sometimes you don't care how many bytes you actually read, I guess.
  // (You know that it's either going to read len bytes or stop at EOF.)
  public static int read(InputStream in, byte[] b, int off, int len) throws IOException {
    checkNotNull(in);
    checkNotNull(b);
    if (len < 0) {

   * }
   */
  private static final SuccessorsFunction<Character> JAVADOC_GRAPH =
      createUndirectedGraph("ba", "ad", "be", "ac", "ec", "cf");

  /**
   * A diamond shaped directed graph (arrows going down):
   *
   * {@snippet :
   *   a
   *  / \
   * b   c
   *  \ /
   *   d
   * }
   */
  private static final SuccessorsFunction<Character> DIAMOND_GRAPH =