Fix for issue 23861: CompletionSuggestion.parameterType are now populated.

pkg/analysis_server/test/services/completion/dart/completion_contributor_util.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.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart' as protocol
     show Element, ElementKind;
@@ skipping 92 matching lines @@
   }
 
   CompletionSuggestion assertSuggest(String completion,
       {CompletionSuggestionKind csKind: CompletionSuggestionKind.INVOCATION,
       int relevance: DART_RELEVANCE_DEFAULT,
       String importUri,
       protocol.ElementKind elemKind: null,
       bool isDeprecated: false,
       bool isPotential: false,
       String elemFile,
-      int elemOffset}) {
+      int elemOffset,
+      String paramName,
+      String paramType}) {
     CompletionSuggestion cs =
         getSuggest(completion: completion, csKind: csKind, elemKind: elemKind);
     if (cs == null) {
       failedCompletion('expected $completion $csKind $elemKind', suggestions);
     }
     expect(cs.kind, equals(csKind));
     if (isDeprecated) {
       expect(cs.relevance, equals(DART_RELEVANCE_LOW));
     } else {
       expect(cs.relevance, equals(relevance), reason: completion);
@@ skipping 10 matching lines @@
       expect(cs.element.location.length, isNotNull);
       expect(cs.element.location.startColumn, isNotNull);
       expect(cs.element.location.startLine, isNotNull);
     }
     if (elemFile != null) {
       expect(cs.element.location.file, elemFile);
     }
     if (elemOffset != null) {
       expect(cs.element.location.offset, elemOffset);
     }
+    if(paramName != null) {
+      expect(cs.parameterName, paramName);
+    }
+    if(paramType != null) {
+      expect(cs.parameterType, paramType);
+    }
     return cs;
   }
 
   CompletionSuggestion assertSuggestClass(String name,
       {int relevance: DART_RELEVANCE_DEFAULT,
       String importUri,
       CompletionSuggestionKind kind: CompletionSuggestionKind.INVOCATION,
       bool isDeprecated: false,
       String elemFile,
       String elemName,
@@ skipping 388 matching lines @@
   }
 
   @override
   void setUp() {
     super.setUp();
     index = createMemoryIndex();
     searchEngine = new SearchEngineImpl(index);
     contributor = createContributor();
   }
 }