### Question:
URICommons { public static String createCacheKey(URI node) { return node.stringValue(); }  static String createCacheKey(URI node); static String createCacheKey(String uri); static String[] splitNamespace(String uri);  }### Answer:
@Test public void testCreateCacheKey() { assertEquals(uri_string, URICommons.createCacheKey(uri)); assertEquals(uri.stringValue(), URICommons.createCacheKey(uri_string)); assertEquals(URICommons.createCacheKey(uri_string), URICommons.createCacheKey(uri)); }