AppProperties properties = mock(AppProperties.class);
when(properties.getProperty(DefaultJSPErrorHandler.JSP_ERROR_FILE))
.thenReturn(errorJsp);
ErrorHandler errorHandler = new DefaultJSPErrorHandler();
View view = errorHandler.handleError(null, properties);
assertTrue(view instanceof JSP);
JSP jspView = (JSP) view;
assertEquals(errorJsp, jspView.getJSPName());
}