Default arg support continued (flutter-intellij#553).

pkg/analysis_server/test/services/completion/dart/inherited_reference_contributor_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.completion.contributor.dart.inherited_ref;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/inherited_reference_contributor.dart';
 import 'package:test/test.dart';
@@ skipping 605 matching lines @@
     assertNotSuggested('y1');
     assertNotSuggested('x2');
     assertNotSuggested('y2');
   }
 }
 
 @reflectiveTest
 class InheritedContributorTest_Driver extends InheritedContributorTest {
   @override
   bool get enableNewAnalysisDriver => true;
+
+  /// Sanity check.  Permutations tested in local_ref_contributor.
+  test_ArgDefaults_inherited_method_with_required_named() async {
+    addMetaPackageSource();
+    resolveSource(
+        '/testB.dart',
+        '''
+import 'package:meta/meta.dart';
+
+lib libB;
+class A {
+   bool foo(int bar, {bool boo, @required int baz}) => false;
+}''');
+    addTestSource('''
+import "/testB.dart";
+class B extends A {
+  b() => f^
 }
+''');
+    await computeSuggestions();
+
+    assertSuggestMethod('foo', 'A', 'bool',
+        defaultArgListString: 'bar, baz: null');
+  }
+}