new FileTimeValue(null);
            fail("Null should not be allowed as value.");
        } catch (IllegalArgumentException exception) {
            assertNotNull(exception.getMessage());
            assertFalse(exception.getMessage().isEmpty());
        }
    }

    public void testEqualsForDifferentTypes() {
        assertFalse(ONE.equals(OTHER_TYPE_ONE));
        assertFalse(OTHER_TYPE_ONE.equals(ONE));
    }

    public void testAsString() {
        assertEquals(ONE.asString(), ONE_VALUE.toString());
        assertEquals(ONE_VALUE.toString(), ONE.asString());
    }

    public void testCompareTo() {
        assertEquals(ONE.compareTo(ANOTHER_ONE), 0);
        assertTrue(ONE.compareTo(TWO) < 0);
        assertTrue(TWO.compareTo(ONE) > 0);
    }

    public void testGetValue() {
        assertEquals(ONE.getValue(), ONE_VALUE);
    }

}