anchor.diff:      addSource(
           '/libA.dart',
           '''
  -library libA; class A { A({int one, String two: 'defaultValue'}) { } }''');
  +library libA; class A { const A({int one, String two: 'defaultValue'}); }''');
       addTestSource('import "/libA.dart"; @A(^) main() { }');
       await computeSuggestions();
       assertSuggestArguments(namedArguments: ['one', 'two']);
  
positive.code: 
    test_ArgumentList_imported_constructor_named_param() async {
      //
      addSource('/libA.dart', 'library libA; class A{A({int one}){}}');
      addTestSource('import "/libA.dart"; main() { new A(^);}');
      await computeSuggestions();
      assertSuggestArguments(namedArguments: ['one']);
  
negative.code: 
    test_Annotation_local_constructor_named_param() async {
      addTestSource('''
  class A { const A({int one, String two: 'defaultValue'}); }
  @A(^) main() { }''');
      await computeSuggestions();
      assertSuggestArguments(namedArguments: ['one', 'two']);
  