add named constructor, cascade selector suggestions and more tests

pkg/analysis_server/test/services/completion/completion_test_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.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol show Element,
     ElementKind;
@@ skipping 34 matching lines @@
     expect(completionOffset, isNot(equals(-1)), reason: 'missing ^');
     int nextOffset = content.indexOf('^', completionOffset + 1);
     expect(nextOffset, equals(-1), reason: 'too many ^');
     content = content.substring(0, completionOffset) +
         content.substring(completionOffset + 1);
     testSource = addSource(testFile, content);
     request =
         new DartCompletionRequest(context, searchEngine, testSource, completionOffset);
   }
 
+  void assertNoSuggestions() {
+    expect(request.suggestions, equals(0));
+  }
+
   void assertNotSuggested(String completion) {
     CompletionSuggestion suggestion = request.suggestions.firstWhere(
         (cs) => cs.completion == completion,
         orElse: () => null);
     if (suggestion != null) {
       _failedCompletion(
           'did not expect completion: $completion\n  $suggestion');
     }
   }
 
   CompletionSuggestion assertSuggest(CompletionSuggestionKind kind,
       String completion, [CompletionRelevance relevance = CompletionRelevance.DEFAULT,
       bool isDeprecated = false, bool isPotential = false]) {
     CompletionSuggestion cs;
     request.suggestions.forEach((s) {
       if (s.completion == completion && s.kind == kind) {
         if (cs == null) {
           cs = s;
         } else {
           _failedCompletion(
               'expected exactly one $completion',
               request.suggestions.where((s) => s.completion == completion));
         }
       }
     });
     if (cs == null) {
-      _failedCompletion('expected $completion', request.suggestions);
+      _failedCompletion('expected $completion $kind', request.suggestions);
     }
     expect(cs.kind, equals(kind));
     expect(cs.relevance, equals(relevance));
     expect(cs.selectionOffset, equals(completion.length));
     expect(cs.selectionLength, equals(0));
     expect(cs.isDeprecated, equals(isDeprecated));
     expect(cs.isPotential, equals(isPotential));
     return cs;
   }
 
   CompletionSuggestion assertSuggestClass(String name,
       [CompletionRelevance relevance = CompletionRelevance.DEFAULT]) {
     CompletionSuggestion cs =
         assertSuggest(CompletionSuggestionKind.CLASS, name, relevance);
     protocol.Element element = cs.element;
     expect(element, isNotNull);
     expect(element.kind, equals(protocol.ElementKind.CLASS));
     expect(element.name, equals(name));
     expect(element.returnType, isNull);
     return cs;
   }
 
+  CompletionSuggestion assertSuggestConstructor(String name,
+      [CompletionRelevance relevance = CompletionRelevance.DEFAULT]) {
+    CompletionSuggestion cs =
+        assertSuggest(CompletionSuggestionKind.CONSTRUCTOR, name, relevance);
+    protocol.Element element = cs.element;
+    expect(element, isNotNull);
+    expect(element.kind, equals(protocol.ElementKind.CONSTRUCTOR));
+    expect(element.name, equals(name));
+    expect(element.returnType, isNull);
+    return cs;
+  }
+
   CompletionSuggestion assertSuggestFunction(String name, String returnType,
       bool isDeprecated, [CompletionRelevance relevance =
       CompletionRelevance.DEFAULT]) {
     CompletionSuggestion cs = assertSuggest(
         CompletionSuggestionKind.FUNCTION,
         name,
         relevance,
         isDeprecated);
     expect(cs.returnType, equals(returnType));
     protocol.Element element = cs.element;
@@ skipping 201 matching lines @@
       sb.write('\n  in');
       AstNode node = completionNode;
       while (node != null) {
         sb.write('\n    ${node.runtimeType}');
         node = node.parent;
       }
     }
     fail(sb.toString());
   }
 }