/**
     *
     */
    @Test
    public void testGetWrapperClassIfWrapper() {
        assertThat(ClassUtil.getWrapperClassIfPrimitive(int.class), is(sameClass(Integer.class)));
        assertThat(ClassUtil.getWrapperClassIfPrimitive(String.class), is(sameClass(String.class)));
        assertThat(ClassUtil.getWrapperClassIfPrimitive(byte.class), is(sameClass(Byte.class)));
    }

    /**
     *
     */
    @Test

     *            The class. Must not be {@literal null}.
     * @return The wrapper class if the argument is a primitive class, otherwise the class passed as the argument.
     */
    public static Class<?> getWrapperClassIfPrimitive(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        final Class<?> ret = getWrapperClass(clazz);
        if (ret != null) {
            return ret;
        }