assertEquals(2, types.length);

        Arrays.sort(types);
        assertEquals("document", types[0]);
        assertEquals("text", types[1]);
    }

    @Test
    public void test_getTypes_empty() {
        String[] types = fileTypeHelper.getTypes();
        assertNotNull(types);
        assertEquals(0, types.length);
    }

    @Test
    public void test_add_overwrite() {