return correct replacementOffset and replacementLength

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/constants.dart';
 import 'package:analysis_server/src/domain_completion.dart';
@@ skipping 143 matching lines @@
       expect(replacementOffset, equals(completionOffset));
       expect(replacementLength, equals(0));
       assertHasResult(CompletionSuggestionKind.CLASS, 'Object');
       assertHasResult(CompletionSuggestionKind.LIBRARY_PREFIX, 'foo');
       assertNoResult('HtmlElement');
       assertNoResult('test');
     });
   }
 
   test_keyword() {
-    addTestFile('^');
+    addTestFile('library A; cl^');
     return getSuggestions().then((_) {
-      expect(replacementOffset, equals(completionOffset));
-      expect(replacementLength, equals(0));
-      assertHasResult(CompletionSuggestionKind.KEYWORD, 'library');
+      expect(replacementOffset, equals(completionOffset - 2));
+      expect(replacementLength, equals(2));
       assertHasResult(CompletionSuggestionKind.KEYWORD, 'import');
       assertHasResult(CompletionSuggestionKind.KEYWORD, 'class');
     });
   }
 
   test_locals() {
     addTestFile('class A {var a; x() {var b;^}}');
     return getSuggestions().then((_) {
       expect(replacementOffset, equals(completionOffset));
       expect(replacementLength, equals(0));
@@ skipping 13 matching lines @@
     });
   }
 
   test_topLevel() {
     addTestFile('''
       typedef foo();
       var test = '';
       main() {tes^t}
     ''');
     return getSuggestions().then((_) {
-//      expect(replacementOffset, equals(completionOffset - 3));
-//      expect(replacementLength, equals(4));
+      expect(replacementOffset, equals(completionOffset - 3));
+      expect(replacementLength, equals(4));
       assertHasResult(CompletionSuggestionKind.CLASS, 'Object');
       assertHasResult(CompletionSuggestionKind.TOP_LEVEL_VARIABLE, 'test');
       assertNoResult('HtmlElement');
     });
   }
 }