@SuppressWarnings("unchecked")
@Test
public void testConvertWhenAddingValue() {
PartialUpdate update = new PartialUpdate("id", "1");
update.addValueToField("field_1", "valueToAdd");
SolrInputDocument document = converter.convert(update);
Assert.assertTrue(document.getFieldValue("field_1") instanceof Map);
Assert.assertEquals("valueToAdd", ((Map<String, Object>) document.getFieldValue("field_1")).get("add"));