assertEquals("line 42", problem.getLocation());

        problem = new DefaultProblem(null, null, null, -1, 127, null);
        assertEquals("column 127", problem.getLocation());

        problem = new DefaultProblem(null, null, "SOURCE", 42, 127, null);
        assertEquals("SOURCE, line 42, column 127", problem.getLocation());
    }

    @Test
    void testGetMessage() {

        assertEquals(0, collector.getProblems().size());

        collector.add(null, "MESSAGE1", -1, -1, null);

        Exception e2 = new Exception();
        collector.add(Severity.WARNING, null, 42, 127, e2);

        assertEquals(2, collector.getProblems().size());

        Problem p1 = collector.getProblems().get(0);
        assertEquals(Severity.ERROR, p1.getSeverity());

        }

        public String value() {
            return this.value;
        }

        @SuppressWarnings("checkstyle:MagicNumber")
        public int hashCode() {
            return 127 * "value".hashCode() ^ this.value.hashCode();
        }

        public boolean equals(Object o) {
            return o instanceof Named && this.value.equals(((Named) o).value());
        }