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");

> Will an upgrade of an existing MinIO cluster impact the SLA of the cluster or will it even cause downtime?

No, an upgrade should not cause any downtime. However, on the first startup -
since MinIO will attempt to migrate any existing IAM data - the boot process may
take slightly longer, but may not be visibly noticeable. Once the migration has

        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) });