@Test
public void testCmp() {

    Value val1 = new Value("hello");
    Value val2 = new Value("world");
    assertFalse("Expected values not to be equal", val1.cmp(val2));
    Value val3 = new Value("hello");
    Value val4 = new Value("hello");
    assertTrue("Expected values to be equal", val3.cmp(val4));
}