final List<Object> row1 = (List<Object>) matrix.get(0);
        assertEquals(1L, row1.get(0));
        assertEquals(2L, row1.get(1));
    }

    @Test
    public void test_parseJwtClaim_mixedArray() throws IOException {
        final String jwtClaim = "{\"mixed\":[\"string\",123,true,null]}";
        final Map<String, Object> attributes = new HashMap<>();