Issue 23239. Fix for 'Create Class' Quick Fix i case of prefixed names.

pkg/analysis_server/test/services/correction/fix_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.services.correction.fix;
 
 import 'package:analysis_server/edit/fix/fix_core.dart';
 import 'package:analysis_server/src/protocol.dart' hide AnalysisError;
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
@@ skipping 371 matching lines @@
 main() {
   Test v = null;
 }
 
 class Test {
 }
 ''');
     _assertLinkedGroup(change.linkedEditGroups[0], ['Test v =', 'Test {']);
   }
 
+  void test_createClass_inLibraryOfPrefix() {
+    // TODO
+    String libCode = r'''
+library my.lib;
+
+class A {}
+''';
+    addSource('/lib.dart', libCode);
+    resolveTestUnit('''
+import 'lib.dart' as lib;
+
+main() {
+  lib.A a = null;
+  lib.Test t = null;
+}
+''');
+    AnalysisError error = _findErrorToFix();
+    fix = _assertHasFix(DartFixKind.CREATE_CLASS, error);
+    change = fix.change;
+    // apply to "lib.dart"
+    List<SourceFileEdit> fileEdits = change.edits;
+    expect(fileEdits, hasLength(1));
+    SourceFileEdit fileEdit = change.edits[0];
+    expect(fileEdit.file, '/lib.dart');
+    expect(SourceEdit.applySequence(libCode, fileEdit.edits), r'''
+library my.lib;
+
+class A {}
+
+class Test {
+}
+''');
+    expect(change.linkedEditGroups, isEmpty);
+  }
+
   void test_createClass_innerLocalFunction() {
     resolveTestUnit('''
 f() {
   g() {
     Test v = null;
   }
 }
 ''');
     assertHasFix(DartFixKind.CREATE_CLASS, '''
 f() {
@@ skipping 3323 matching lines @@
 
   List<Position> _findResultPositions(List<String> searchStrings) {
     List<Position> positions = <Position>[];
     for (String search in searchStrings) {
       int offset = resultCode.indexOf(search);
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 }