### Question:
WorkflowNamespaceContext implements NamespaceContext { public String getPrefix(String uri) { throw new UnsupportedOperationException(); }  String getNamespaceURI(String prefix); String getPrefix(String uri); Iterator getPrefixes(String uri);  }### Answer:
@Test(expected = UnsupportedOperationException.class) public void testGetPrefix() { WorkflowNamespaceContext instance = new WorkflowNamespaceContext(); String result = instance.getPrefix(null); }