protected AssertionUtil() {
    }

    /**
     * Asserts that the argument is not <code>null</code>.
     *
     * @param argName
     *            The name of the argument that must not be {@code null}.
     * @param argValue
     *            The value of the argument.
     * @throws NullArgumentException
     *             If the argument is <code>null</code>.
     */

    }

    /**
     * Returns the element type of the parameterized collection declared as the method's argument type.
     *
     * @param method
     *            The method. Cannot be {@literal null}
     * @param position
     *            The position of the parameterized collection in the method's argument list
     * @return The element type of the parameterized collection
     */

     * <li>If <code>type</code> is an array, the actual class of its elements is returned.</li>
     * <li>Otherwise, <code>null</code> is returned.</li>
     * </ul>
     *
     * @param type
     *            the type to analyze
     * @param map
     *            the map that contains the type variables and type arguments

    }

    /**
     * If the argument type at the specified position is a number, converts the argument to match the type.
     *
     * @param paramTypes
     *            array of parameter types
     * @param args
     *            array of arguments
     * @param index
     *            index of the argument to operate on
     * @return {@literal true} if the argument was converted to match the type
     */

     * If either or both arrays have a length of {@literal 0}, the other array is returned as is.
     * In any case, the returned array is the same instance as the argument array and is not copied.
     * </p>
     *
     * @param <T>
     *            the type of the array elements
     * @param a
     *            first array
     * @param b
     *            second array

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

     * @return the given string, or an empty string if the argument is <code>null</code>
     */
    public static String defaultString(final String str) {
        return str == null ? EMPTY : str;
    }

    /**
     * Returns the given string, or the specified default string if the argument is <code>null</code>.
     * <p>
     * Usage example:
     * </p>
     *
     * <pre>

    }

    @Nested
    @DisplayName("Argument parsing")
    class ArgumentParsing {

        @Test
        @DisplayName("URL parameter is correctly parsed")
        void urlParameterParsing() {
            String expectedUrl = "smb://server/share/test.txt";
            TestLocking t = new TestLocking();

            // Simulate argument parsing

        // When
        RuntimeCIFSException exception = new RuntimeCIFSException(cause);

        // Then
        assertNotNull(exception);
        assertEquals(cause, exception.getCause());
        assertTrue(exception.getMessage().contains("IllegalArgumentException"));
        assertTrue(exception.getMessage().contains("Invalid argument"));
    }

    @Test

        verify(signingDigest, times(5)).verify(any(byte[].class), anyInt(), anyInt(), anyInt(), any());
    }

    @Test
    @DisplayName("Test sign method invocation with argument capture")
    void testSignMethodArgumentCapture() {
        // Arrange
        ArgumentCaptor<byte[]> dataCaptor = ArgumentCaptor.forClass(byte[].class);