List<Map<String, Object>> columnsProperties = (List<Map<String, Object>>)mainConf.get(DTConstants.DT_AOCOLUMNS);
assertThat(columnsProperties).hasSize(1);
Map<String, Object> firstColumnProperties = columnsProperties.get(0);
Map<String, Object> customProperties = new HashMap<String, Object>(defaultProperties);
customProperties.put(DTConstants.DT_COLUMN_RENDERER, new JavascriptSnippet("aRenderFunction"));
customProperties.put(DTConstants.DT_S_DEFAULT_CONTENT, "");
assertThat(firstColumnProperties).isEqualTo(customProperties);
}