this.value3 = value3;
    }

    /**
     * Returns the fourth value.
     *
     * @return The fourth value
     */
    public T4 getValue4() {
        return value4;
    }

    /**
     * Sets the fourth value.
     *
     * @param value4
     *            The fourth value
     */
    public void setValue4(final T4 value4) {
        this.value4 = value4;

        this.value3 = value3;
    }

    /**
     * Returns the fourth value.
     *
     * @return The fourth value
     */
    public T4 getValue4() {
        return value4;
    }

    /**
     * Sets the fourth value.
     *
     * @param value4
     *            The fourth value
     */
    public void setValue4(final T4 value4) {
        this.value4 = value4;

        // Multiple leading backslashes - only first one gets stripped, then trailing ones get stripped
        // But getPath() adds a backslash at the beginning, so \\fourth\path\\ becomes \fourth\path\
        request.setPath("\\\\fourth\\path\\\\");
        assertEquals("\\\\fourth\\path\\", request.getPath());
    }

        CommonServerMessageBlockRequest fourth = third.getNext();
        boolean firstAllowsSecond = request.allowChain(nextRequest);
        boolean secondAllowsThird = nextRequest.allowChain(thirdRequest);

        // Then
        assertEquals(nextRequest, second);
        assertEquals(thirdRequest, third);
        assertNull(fourth);
        assertTrue(firstAllowsSecond);

        assertEquals(0, dst[1], "Second byte should be 0");
        assertEquals(0, dst[2], "Third byte should be 0 (no FID)");
        assertEquals(0, dst[3], "Fourth byte should be 0 (no FID)");
    }

    @Test
    public void testReadSetupWireFormat() {
        // Test the readSetupWireFormat method
        TransWaitNamedPipe pipe = new TransWaitNamedPipe("\\\\pipe\\testPipe");

  ZERO(0),
  /** Test a one-element collection. */
  ONE(1),
  /** Test a three-element collection. */
  SEVERAL(3),
  /*
   * TODO: add VERY_LARGE, noting that we currently assume that the fourth
   * sample element is not in any collection
   */

  ANY(ZERO, ONE, SEVERAL);

  private final Set<Feature<? super Collection>> implied;
  private final @Nullable Integer numElements;

  ZERO(0),
  /** Test a one-element collection. */
  ONE(1),
  /** Test a three-element collection. */
  SEVERAL(3),
  /*
   * TODO: add VERY_LARGE, noting that we currently assume that the fourth
   * sample element is not in any collection
   */

  ANY(ZERO, ONE, SEVERAL);

  private final Set<Feature<? super Collection>> implied;
  private final @Nullable Integer numElements;

    }

    @Test
    @DisplayName("Should join multiple elements with delimiter")
    void testJoinMultipleElements() {
        String result = StringUtil.join(",", "one", "two", "three", "four");
        assertEquals("one,two,three,four", result);
    }

    @Test
    @DisplayName("Should join with empty string delimiter")
    void testJoinWithEmptyDelimiter() {
        String result = StringUtil.join("", "hello", "world");

   * @param <V4> the type returned by the fourth future
   */
  public static final class Combiner4<
          V1 extends @Nullable Object,
          V2 extends @Nullable Object,
          V3 extends @Nullable Object,
          V4 extends @Nullable Object>
      extends Combiner {
    /**
     * A function that returns a value when applied to the values of the four futures passed to

  private abstract static class Third<T, D> extends Second<T> {}

  private abstract static class Fourth<T, D> extends Third<D, T> {}

  private static class ConcreteIntegerString extends Fourth<Integer, String> {}

  private static class ConcreteStringInteger extends Fourth<String, Integer> {}

  public void testAssignableClassToClass() {
    @SuppressWarnings("rawtypes") // To test TypeToken<List>