assertNotNull(elt);
parameterInfoHandler.showParameterInfo(elt, createContext);
Object[] items = createContext.getItemsToShow();
assertTrue(items != null);
assertTrue(items.length > 0);
MockParameterInfoUIContext context = new MockParameterInfoUIContext<PsiElement>(elt);
parameterInfoHandler.updateUI((DartFunctionDescription)items[0], context);
assertEquals(infoText, parameterInfoHandler.myParametersListPresentableText);
// index check
MockUpdateParameterInfoContext updateContext = new MockUpdateParameterInfoContext(myEditor, myFile);