private final List<Suppression> suppressions = new ArrayList<>();

    @Override
    public void suppress(Closeable closeable, Throwable thrown, Throwable suppressed) {
      suppressions.add(new Suppression(closeable, thrown, suppressed));
    }
  }

  /** Record of a call to suppress. */
  private static class Suppression {
    private final Closeable closeable;
    private final Throwable thrown;

  public void testCopyExceptions() {
    // test that exceptions are suppressed

    for (ByteSource in : BROKEN_SOURCES) {
      int suppressed = runSuppressionFailureTest(in, newNormalByteSink());
      assertEquals(0, suppressed);

      suppressed = runSuppressionFailureTest(in, BROKEN_CLOSE_SINK);
      assertEquals((in == BROKEN_OPEN_SOURCE) ? 0 : 1, suppressed);
    }

    for (ByteSink out : BROKEN_SINKS) {

    private final List<Suppression> suppressions = new ArrayList<>();

    @Override
    public void suppress(Closeable closeable, Throwable thrown, Throwable suppressed) {
      suppressions.add(new Suppression(closeable, thrown, suppressed));
    }
  }

  /** Record of a call to suppress. */
  private static class Suppression {
    private final Closeable closeable;
    private final Throwable thrown;

        assertEquals(1, suppressed.length);
        assertEquals(suppressedException, suppressed[0]);
        assertEquals("Suppressed exception", suppressed[0].getMessage());
    }

  }

  @VisibleForTesting final Suppressor suppressor;

  // only need space for 2 elements in most cases, so try to use the smallest array possible
  private final Deque<Closeable> stack = new ArrayDeque<>(4);
  private @Nullable Throwable thrown;

  @VisibleForTesting
  Closer(Suppressor suppressor) {
    this.suppressor = checkNotNull(suppressor); // checkNotNull to satisfy null tests
  }

  /**

  public void testCopyExceptions() {
    // test that exceptions are suppressed

    for (CharSource in : BROKEN_SOURCES) {
      int suppressed = runSuppressionFailureTest(in, newNormalCharSink());
      assertEquals(0, suppressed);

      suppressed = runSuppressionFailureTest(in, BROKEN_CLOSE_SINK);
      assertEquals((in == BROKEN_OPEN_SOURCE) ? 0 : 1, suppressed);
    }

    for (CharSink out : BROKEN_SINKS) {

        Throwable[] suppressed = mainException.getSuppressed();
        assertEquals(1, suppressed.length);
        assertEquals(suppressedException, suppressed[0]);
    }

    @Test
    @DisplayName("Should provide correct cause for constructor with cause only")
    void testCauseOnlyConstructorMessage() {
        // Given
        RuntimeException cause = new RuntimeException("Specific cause message");

        // When

  public void testCopyExceptions() {
    // test that exceptions are suppressed

    for (ByteSource in : BROKEN_SOURCES) {
      int suppressed = runSuppressionFailureTest(in, newNormalByteSink());
      assertEquals(0, suppressed);

      suppressed = runSuppressionFailureTest(in, BROKEN_CLOSE_SINK);
      assertEquals((in == BROKEN_OPEN_SOURCE) ? 0 : 1, suppressed);
    }

    for (ByteSink out : BROKEN_SINKS) {

    Throwable[] suppressed = e.getSuppressed();
    assertThat(suppressed).hasLength(2);
    assertThat(suppressed[0]).hasCauseThat().isInstanceOf(IllegalStateException.class);
    assertThat(suppressed[0]).hasCauseThat().hasMessageThat().isEqualTo("run failure");

    assertThat(suppressed[1]).hasCauseThat().isInstanceOf(IllegalStateException.class);

    Throwable[] suppressed = e.getSuppressed();
    assertThat(suppressed).hasLength(2);
    assertThat(suppressed[0]).hasCauseThat().isInstanceOf(IllegalStateException.class);
    assertThat(suppressed[0]).hasCauseThat().hasMessageThat().isEqualTo("run failure");

    assertThat(suppressed[1]).hasCauseThat().isInstanceOf(IllegalStateException.class);