assertEquals("", p2.getMessage());
        assertEquals(42, p2.getLineNumber());
        assertEquals(127, p2.getColumnNumber());
        assertEquals(e2, p2.getException());
    }

    @Test
    void testSetSource() {
        DefaultProblemCollector collector = new DefaultProblemCollector(null);

        collector.add(null, "PROBLEM1", -1, -1, null);

        collector.setSource("SOURCE_PROBLEM2");

        Exception e = new Exception();
        problem = new DefaultProblem(null, null, null, -1, -1, e);
        assertSame(e, problem.getException());
    }

    @Test
    void testGetSource() {
        DefaultProblem problem = new DefaultProblem(null, null, null, -1, -1, null);
        assertEquals("", problem.getSource());

        problem = new DefaultProblem(null, null, "", -1, -1, null);

        assertNotNull(map.get(FieldNames.LANGUAGES));
        assertNotNull(map.get(FieldNames.KINDS));
        assertNotNull(map.get(FieldNames.TIMESTAMP));
    }

    @Test
    public void testGetSource() {
        // Test getSource method
        String[] text = { "source", "test" };
        String[][] readings = { { "source" }, { "test" } };
        String[] fields = { "field1" };