add arguments to constructor completions

pkg/analysis_server/test/services/completion/local_computer_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.dart.local;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/local_computer.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 15 matching lines @@
         relevance: relevance, isDeprecated: isDeprecated);
   }
 
   @override
   CompletionSuggestion assertSuggestLocalClassTypeAlias(String name,
       {int relevance: DART_RELEVANCE_DEFAULT}) {
     return assertSuggestClassTypeAlias(name, relevance);
   }
 
   @override
+  CompletionSuggestion assertSuggestLocalConstructor(String name) {
+    return assertSuggestConstructor(name);
+  }
+
+  @override
   CompletionSuggestion assertSuggestLocalField(String name, String type,
       {int relevance: DART_RELEVANCE_LOCAL_FIELD, bool deprecated: false}) {
     return assertSuggestField(name, type,
         relevance: relevance, isDeprecated: deprecated);
   }
 
   @override
   CompletionSuggestion assertSuggestLocalFunction(
       String name, String returnType,
       {bool deprecated: false, int relevance: DART_RELEVANCE_LOCAL_FUNCTION}) {
@@ skipping 471 matching lines @@
     CompletionSuggestion suggestion = assertSuggestLocalFunction('m', 'void');
     expect(suggestion.parameterNames, hasLength(2));
     expect(suggestion.parameterNames[0], 'x');
     expect(suggestion.parameterTypes[0], 'dynamic');
     expect(suggestion.parameterNames[1], 'y');
     expect(suggestion.parameterTypes[1], 'int');
     expect(suggestion.requiredParameterCount, 2);
     expect(suggestion.hasNamedParameters, false);
   }
 
+  test_InstanceCreationExpression() {
+    addTestSource('''
+class A {foo(){var f; {var x;}}}
+class B {B(this.x, [String boo]) { } int x;}
+class C {C.bar({boo: 'hoo', int z: 0}) { } }
+main() {new ^ String x = "hello";}''');
+    computeFast();
+    return computeFull((bool result) {
+      CompletionSuggestion suggestion;
+
+      suggestion = assertSuggestLocalConstructor('A');
+      expect(suggestion.element.parameters, '()');
+      expect(suggestion.element.returnType, 'A');
+      expect(suggestion.declaringType, 'A');
+      expect(suggestion.parameterNames, hasLength(0));
+      expect(suggestion.requiredParameterCount, 0);
+      expect(suggestion.hasNamedParameters, false);
+
+      suggestion = assertSuggestLocalConstructor('B');
+      expect(suggestion.element.parameters, '(int x, [String boo])');
+      expect(suggestion.element.returnType, 'B');
+      expect(suggestion.declaringType, 'B');
+      expect(suggestion.parameterNames, hasLength(2));
+      expect(suggestion.parameterNames[0], 'x');
+      expect(suggestion.parameterTypes[0], 'int');
+      expect(suggestion.parameterNames[1], 'boo');
+      expect(suggestion.parameterTypes[1], 'String');
+      expect(suggestion.requiredParameterCount, 1);
+      expect(suggestion.hasNamedParameters, false);
+
+      suggestion = assertSuggestLocalConstructor('C.bar');
+      expect(suggestion.element.parameters, '({dynamic boo, int z})');
+      expect(suggestion.element.returnType, 'C');
+      expect(suggestion.declaringType, 'C');
+      expect(suggestion.parameterNames, hasLength(2));
+      expect(suggestion.parameterNames[0], 'boo');
+      expect(suggestion.parameterTypes[0], 'dynamic');
+      expect(suggestion.parameterNames[1], 'z');
+      expect(suggestion.parameterTypes[1], 'int');
+      expect(suggestion.requiredParameterCount, 0);
+      expect(suggestion.hasNamedParameters, true);
+    });
+  }
+
   test_method_parameters_mixed_required_and_named() {
     addTestSource('''
 class A {
   void m(x, {int y}) {}
 }
 class B extends A {
   main() {^}
 }
 ''');
     expect(computeFast(), isTrue);
@@ skipping 103 matching lines @@
         assertSuggestLocalMethod('m', 'A', 'void');
     expect(suggestion.parameterNames, hasLength(2));
     expect(suggestion.parameterNames[0], 'x');
     expect(suggestion.parameterTypes[0], 'dynamic');
     expect(suggestion.parameterNames[1], 'y');
     expect(suggestion.parameterTypes[1], 'int');
     expect(suggestion.requiredParameterCount, 2);
     expect(suggestion.hasNamedParameters, false);
   }
 }