Return RequestErrorCode.NO_INDEX_GENERATED if no index.

pkg/analysis_server/test/domain_completion_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.domain.completion;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/channel/channel.dart';
@@ skipping 16 matching lines @@
 
 import 'analysis_abstract.dart';
 import 'mock_sdk.dart';
 import 'mocks.dart';
 import 'reflective_tests.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(CompletionManagerTest);
   runReflectiveTests(CompletionTest);
+  runReflectiveTests(_NoSearchEngine);
 }
 
 @reflectiveTest
 class CompletionManagerTest extends AbstractAnalysisTest {
   AnalysisDomainHandler analysisDomain;
   Test_CompletionDomainHandler completionDomain;
   Request request;
   int requestCount = 0;
   String testFile2 = '/project/bin/test2.dart';
 
   AnalysisServer createAnalysisServer(Index index) {
     return new Test_AnalysisServer(
         super.serverChannel,
         super.resourceProvider,
         super.packageMapProvider,
         index,
         new AnalysisServerOptions(),
         new MockSdk(),
         InstrumentationService.NULL_SERVICE);
   }
 
+  @override
+  Index createIndex() {
+    return createLocalMemoryIndex();
+  }
+
   void sendRequest(String path) {
     String id = (++requestCount).toString();
     request = new CompletionGetSuggestionsParams(path, 0).toRequest(id);
     Response response = handler.handleRequest(request);
     expect(response, isResponseSuccess(id));
   }
 
   @override
   void setUp() {
     super.setUp();
@@ skipping 590 matching lines @@
 
   void contextsChangedRaw(ContextsChangedEvent newEvent) {
     super.contextsChanged(newEvent);
   }
 
   CompletionManager createCompletionManager(AnalysisContext context,
       Source source, SearchEngine searchEngine) {
     return new MockCompletionManager(mockContext, source, searchEngine);
   }
 }
+
+@reflectiveTest
+class _NoSearchEngine extends AbstractAnalysisTest {
+  @override
+  void setUp() {
+    super.setUp();
+    createProject();
+    handler = new CompletionDomainHandler(server);
+  }
+
+  test_noSearchEngine() async {
+    addTestFile('''
+main() {
+  ^
+}
+    ''');
+    await waitForTasksFinished();
+      Request request =
+          new CompletionGetSuggestionsParams(testFile, 0).toRequest('0');
+      Response response = handler.handleRequest(request);
+      expect(response.error, isNotNull);
+      expect(response.error.code, RequestErrorCode.NO_INDEX_GENERATED);
+  }
+}