String field = "content";

        List<String> readings = converter.convert(text, field, "en", "ja", "fr");

        assertNotNull(readings);
        assertEquals(3, readings.size());
        assertEquals("TEST_en", readings.get(0));
        assertEquals("TEST_ja", readings.get(1));
        assertEquals("TEST_fr", readings.get(2));
    }

    @Test
    public void testConvertWithNoLanguages() throws IOException {