void constructor_invalidMode_throws() {
        SmbFile file = mock(SmbFile.class);
        assertThrows(IllegalArgumentException.class, () -> new SmbRandomAccessFile(file, "badmode"));
    }

    @Test
    @DisplayName("open(): acquires and releases handle (no I/O)")
    void open_acquiresAndReleasesHandle() throws Exception {

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

import org.codelibs.core.exception.IORuntimeException;

/**
 * Utility for {@link Channel}.
 *
 * Author: koichik
 */
public abstract class ChannelUtil {

    /**
     * Do not instantiate.

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel.MapMode;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

/**

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel.MapMode;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

/**

# Hibernate Validator
# -------------------
constraints.CreditCardNumber.message = {item} is geen geldig creditcardnummer.
constraints.EAN.message = {item} is geen geldige {type} barcode.
constraints.Email.message = {item} is geen geldig e-mailadres.
constraints.Length.message = De lengte van {item} moet tussen {min} en {max} liggen.
constraints.LuhnCheck.message = De Luhn Modulo 11 checksum van {value} is onjuist.

# Hibernate Validator
# -------------------
constraints.CreditCardNumber.message = {item} ist eine ungültige Kreditkartennummer.
constraints.EAN.message = {item} ist ein ungültiger {type}-Barcode.
constraints.Email.message = {item} ist keine gültige E-Mail-Adresse.
constraints.Length.message = Die Länge von {item} muss zwischen {min} und {max} liegen.

# Hibernate Validator
# -------------------
constraints.CreditCardNumber.message = {item} is an invalid credit card number.
constraints.EAN.message = {item} is an invalid {type} barcode.
constraints.Email.message = {item} is not a valid email address.
constraints.Length.message = The length of {item} must be between {min} and {max}.
constraints.LuhnCheck.message = The Luhn Modulo 11 checksum of {value} is incorrect.

# Hibernate Validator
# -------------------
constraints.CreditCardNumber.message = {item} is an invalid credit card number.
constraints.EAN.message = {item} is an invalid {type} barcode.
constraints.Email.message = {item} is not a valid email address.
constraints.Length.message = The length of {item} must be between {min} and {max}.
constraints.LuhnCheck.message = The Luhn Modulo 11 checksum of {value} is incorrect.

	if contextCanceled(ctx) {
		return nil, time.Time{}, ctx.Err()
	}

	if err := checkPathLength(itemPath); err != nil {
		return nil, time.Time{}, err
	}

	f, err := OpenFile(itemPath, readMode, 0o666)
	if err != nil {
		return nil, time.Time{}, err
	}
	defer f.Close()
	stat, err := f.Stat()
	if err != nil {
		return nil, time.Time{}, err
	}
	if stat.IsDir() {

					req.Header.Set("authorization", req.Header.Get("authorization")+"a")
					// Setting an invalid Content-MD5 to force a Md5 Mismatch error.
					// Used in tesr case 7.
				case BadMD5:
					req.Header.Set("Content-MD5", "badmd5")
				}

				// invoke the PutObjectPart HTTP handler.
				apiRouter.ServeHTTP(rec, req)

				// validate the error response.
				want := getAPIError(test.expectedAPIError)