### Question:
Utilities { public static int byteArrayToInteger(byte[] bytes) { int result = 0; for (byte aByte : bytes) { result = result << 8 | aByte & 0xff; } return result; }  static String objectToJson(Object object); static ExecutorService getSingleThreadExecutor(String name); static ListeningExecutorService getSingleThreadListeningExecutor(String name); static ListeningExecutorService getListeningExecutorService(String name,
                                                                       int corePoolSize,
                                                                       int maximumPoolSize,
                                                                       long keepAliveTimeInSec); static ThreadPoolExecutor getThreadPoolExecutor(String name,
                                                           int corePoolSize,
                                                           int maximumPoolSize,
                                                           long keepAliveTimeInSec); @SuppressWarnings("SameParameterValue") static ScheduledThreadPoolExecutor getScheduledThreadPoolExecutor(String name,
                                                                             int corePoolSize,
                                                                             int maximumPoolSize,
                                                                             long keepAliveTimeInSec); static boolean isMacMenuBarDarkMode(); static boolean isUnix(); static boolean isWindows(); static boolean isQubesOS(); static boolean isOSX(); static boolean isLinux(); static boolean isDebianLinux(); static boolean isRedHatLinux(); static String getOSVersion(); static File getUserDataDir(); static int getMinorVersion(); static int getMajorVersion(); static String getOSArchitecture(); static void printSysInfo(); static String getJVMArchitecture(); static boolean isCorrectOSArchitecture(); static void openURI(URI uri); static void openFile(File file); static String getDownloadOfHomeDir(); static void copyToClipboard(String content); static void setThreadName(String name); static boolean isDirectory(String path); static String getSystemHomeDirectory(); static String encodeToHex(@Nullable byte[] bytes, boolean allowNullable); static String bytesAsHexString(@Nullable byte[] bytes); static String encodeToHex(@Nullable byte[] bytes); static byte[] decodeFromHex(String encoded); static boolean isAltOrCtrlPressed(KeyCode keyCode, KeyEvent keyEvent); static boolean isCtrlPressed(KeyCode keyCode, KeyEvent keyEvent); static boolean isAltPressed(KeyCode keyCode, KeyEvent keyEvent); static boolean isCtrlShiftPressed(KeyCode keyCode, KeyEvent keyEvent); static byte[] concatenateByteArrays(byte[] array1, byte[] array2); static Date getUTCDate(int year, int month, int dayOfMonth); static Set<String> commaSeparatedListToSet(String stringList, boolean allowWhitespace); static String getPathOfCodeSource(); static String toTruncatedString(Object message); static String toTruncatedString(Object message, int maxLength); static String toTruncatedString(Object message, int maxLength, boolean removeLineBreaks); static String getRandomPrefix(int minLength, int maxLength); static String getShortId(String id); @SuppressWarnings("SameParameterValue") static String getShortId(String id, String sep); static byte[] integerToByteArray(int intValue, int numBytes); static int byteArrayToInteger(byte[] bytes); static Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor);  }### Answer:
@Test public void testByteArrayToInteger() { assertEquals(0, Utilities.byteArrayToInteger(Utilities.decodeFromHex("0000"))); assertEquals(65535, Utilities.byteArrayToInteger(Utilities.decodeFromHex("ffff"))); assertEquals(4352, Utilities.byteArrayToInteger(Utilities.decodeFromHex("1100"))); assertEquals(17, Utilities.byteArrayToInteger(Utilities.decodeFromHex("0011"))); assertEquals(56610, Utilities.byteArrayToInteger(Utilities.decodeFromHex("dd22"))); assertEquals(2147483647, Utilities.byteArrayToInteger(Utilities.decodeFromHex("7fffffff"))); assertEquals(-2147483648, Utilities.byteArrayToInteger(Utilities.decodeFromHex("80000000"))); assertEquals(1114129, Utilities.byteArrayToInteger(Utilities.decodeFromHex("00110011"))); assertEquals(-1114129, Utilities.byteArrayToInteger(Utilities.decodeFromHex("ffeeffef"))); }