send completion notification even if offset beyond eof

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 235 matching lines @@
 
 @reflectiveTest
 class CompletionTest extends AbstractAnalysisTest {
   String completionId;
   int completionOffset;
   int replacementOffset;
   int replacementLength;
   List<CompletionSuggestion> suggestions = [];
   bool suggestionsDone = false;
 
-  String addTestFile(String content) {
+  String addTestFile(String content, {offset}) {
     completionOffset = content.indexOf('^');
+    if (offset != null) {
+      expect(completionOffset, -1, reason: 'cannot supply offset and ^');
+      completionOffset = offset;
+      return super.addTestFile(content);
+    }
     expect(completionOffset, isNot(equals(-1)), reason: 'missing ^');
     int nextOffset = content.indexOf('^', completionOffset + 1);
     expect(nextOffset, equals(-1), reason: 'too many ^');
     return super.addTestFile(content.substring(0, completionOffset) +
         content.substring(completionOffset + 1));
   }
 
   void assertHasResult(CompletionSuggestionKind kind, String completion,
       [int relevance = DART_RELEVANCE_DEFAULT, bool isDeprecated = false,
       bool isPotential = false]) {
@@ skipping 161 matching lines @@
       assertHasResult(
           CompletionSuggestionKind.INVOCATION, 'a', DART_RELEVANCE_LOCAL_FIELD);
       assertHasResult(CompletionSuggestionKind.INVOCATION, 'b',
           DART_RELEVANCE_LOCAL_VARIABLE);
       assertHasResult(CompletionSuggestionKind.INVOCATION, 'x',
           DART_RELEVANCE_LOCAL_METHOD);
       assertHasResult(CompletionSuggestionKind.INVOCATION, 'DateTime');
     });
   }
 
+  test_offset_past_eof() {
+    addTestFile('main() { }', offset: 300);
+    return getSuggestions().then((_) {
+      expect(replacementOffset, equals(300));
+      expect(replacementLength, equals(0));
+      expect(suggestionsDone, true);
+      expect(suggestions.length, 0);
+    });
+  }
+
   test_overrides() {
     addFile('/libA.dart', 'class A {m() {}}');
     addTestFile('''
 import '/libA.dart';
 class B extends A {m() {^}}
 ''');
     return getSuggestions().then((_) {
       expect(replacementOffset, equals(completionOffset));
       expect(replacementLength, equals(0));
       assertHasResult(CompletionSuggestionKind.INVOCATION, 'm',
@@ skipping 240 matching lines @@
 }
     ''');
     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);
   }
 }