@Override
    public String toString() {
        if (cwes.isEmpty()) {
            return "";
        }
        return cwes.stream().map(CweDB::getFullName).collect(Collectors.joining(", "));
    }
@Test
    public void testToString() {
        CweSet instance = new CweSet();
        instance.addCwe("CWE-79");
        String expResult = "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')";
        String result = instance.toString();
        assertEquals(expResult, result);
    }