### Question:
ProxyUtils { public static <T> T nullValue(Class<T> type) { @SuppressWarnings("unchecked") final T result = (T) NULL_VALUE_MAP.get(type); return result; } private  ProxyUtils(); static Class<?>[] getAllInterfaces(Class<?> cls); static String getJavaClassName(Class<?> clazz); static Class<?> getWrapperClass(Class<?> primitiveType); static T nullValue(Class<T> type); static boolean isEqualsMethod(Method method); static boolean isHashCode(Method method); static ProxyFactory proxyFactory(); static final Object[] EMPTY_ARGUMENTS; static final Class<?>[] EMPTY_ARGUMENT_TYPES; }### Answer:
@Test public void testNullValue() { assertNullValue(null, String.class); assertNullValue(Character.valueOf((char) 0), Character.TYPE); assertNullValue(Integer.valueOf(0), Integer.TYPE); assertNullValue(Long.valueOf(0), Long.TYPE); assertNullValue(Short.valueOf((short) 0), Short.TYPE); assertNullValue(Double.valueOf(0), Double.TYPE); assertNullValue(Float.valueOf(0), Float.TYPE); assertNullValue(Boolean.FALSE, Boolean.TYPE); assertNullValue(Byte.valueOf((byte) 0), Byte.TYPE); }