PeekingIterator<?> peekingIterator = peekingIterator(iterator);

    assertEquals("A", peekingIterator.next());
    assertEquals("B", peekingIterator.peek());

    /* Should complain on attempt to remove() after peek(). */
    assertThrows(IllegalStateException.class, () -> peekingIterator.remove());

    assertEquals(
        "After remove() throws exception, peek should still be ok", "B", peekingIterator.peek());

func TestNewErasureSets(t *testing.T) {
	ctx, cancel := context.WithCancel(t.Context())
	defer cancel()

	nDisks := 16 // Maximum disks.
	var erasureDisks []string
	for range nDisks {
		// Do not attempt to create this path, the test validates
		// so that newErasureSets initializes non existing paths
		// and successfully returns initialized object layer.
		disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())

		cachesRoot: make(map[string][]string, 10),
	}
}

func (b *bucketMetacache) debugf(format string, data ...any) {
	if serverDebugLog {
		console.Debugf(format+"\n", data...)
	}
}

// findCache will attempt to find a matching cache for the provided options.
// If a cache with the same ID exists already it will be returned.
// If none can be found a new is created with the provided ID.

    // Don't copy this into your own test!
    // Use e.g. awaitClear or await(CountDownLatch) instead.
    GcFinalization.awaitFullGc();

    // Attempt to help with some flakiness that we've seen: b/387521512.
    GcFinalization.awaitFullGc();

    assertEquals(0, finalizerRan.getCount());
    assertThat(ref.get()).isNull();
  }

	if err = reliableMkdirAll(path.Dir(dstFilePath), 0o777, baseDir); err != nil {
		return err
	}

	i := 0
	for {
		// After a successful parent directory create attempt a renameAll.
		if err = Rename(srcFilePath, dstFilePath); err != nil {
			// Retry only for the first retryable error.
			if osIsNotExist(err) && i == 0 {
				i++
				continue
			}
		}
		break
	}

    //                                                         =========================

    @Test
    public void test_security_pathTraversalWithLogExtension() {
        // These patterns attempt to access files outside the log directory
        // but must end with .log to pass isLogFilename check

        String sanitized1 = AdminLogAction.sanitizeFilename("../../../var/log/auth.log");

        verify(resource, times(2)).close();
    }

    @Test
    @DisplayName("Iterator with filter throwing exception")
    void iteratorWithFilterException() throws Exception {
        // Setup: first attempt throws, second succeeds
        FileEntry entry1 = mock(FileEntry.class);
        FileEntry entry2 = mock(FileEntry.class);

        when(delegate.hasNext()).thenReturn(true, true, false);

        assertThrows(SmbException.class, () -> tree.send(request, response));
    }

    @Test
    void testTreeConnectWithWaitInterrupted() throws Exception {
        // Create a tree and simulate concurrent connection attempt
        SmbTree tree = new SmbTree(session, "testShare", "testService");

        // Mock transport.connect() to throw RuntimeException wrapping InterruptedException

        .isNotEqualTo(fingerprint(stringB.getBytes(UTF_8)));

    // ISO 8859-1 only has 0-255 (ubyte) representation so throws away UTF-8 characters
    // greater than 127 (ie with their top bit set).
    // Don't attempt to do this in real code.
    assertEquals(
        fingerprint(stringA.getBytes(ISO_8859_1)), fingerprint(stringB.getBytes(ISO_8859_1)));
  }

  public void testPutNonChars() {
    Hasher hasher = HASH_FN.newHasher();

    void readBytesWireFormatTooShortException() {
        Configuration cfg = mock(Configuration.class);
        SmbComLockingAndX cmd = new SmbComLockingAndX(cfg);
        // arrays of size 1 so internal method will attempt to decode a range
        setField(cmd, "unlocks", new LockingAndXRange[] { new LockingAndXRange(false) });
        setField(cmd, "locks", new LockingAndXRange[] { new LockingAndXRange(false) });