Casted variable declarations for 'if (v is! Type)' should be declared after IfStatement.

pkg/analysis_server/test/services/correction/assist_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.assist;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/correction/assist.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 1558 matching lines @@
   void test_introduceLocalTestedType_BAD_notIsExpression() {
     resolveTestUnit('''
 main(p) {
   if (p == null) {
   }
 }
 ''');
     assertNoAssistAt('if (p', AssistKind.INTRODUCE_LOCAL_CAST_TYPE);
   }
 
-  void test_introduceLocalTestedType_OK_if() {
+  void test_introduceLocalTestedType_OK_if_is() {
     resolveTestUnit('''
 class MyTypeName {}
 main(p) {
   if (p is MyTypeName) {
   }
   p = null;
 }
 ''');
     String expected = '''
 class MyTypeName {}
 main(p) {
   if (p is MyTypeName) {
     MyTypeName myTypeName = p;
   }
   p = null;
 }
 ''';
     assertHasAssistAt(
         'is MyType', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
     _assertLinkedGroup(change.linkedEditGroups[0], [
       'myTypeName = '
     ], expectedSuggestions(
         LinkedEditSuggestionKind.VARIABLE, ['myTypeName', 'typeName', 'name']));
     // another good location
     assertHasAssistAt('if (p', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
   }
 
+  void test_introduceLocalTestedType_OK_if_isNot() {
+    resolveTestUnit('''
+class MyTypeName {}
+main(p) {
+  if (p is! MyTypeName) {
+    return;
+  }
+}
+''');
+    String expected = '''
+class MyTypeName {}
+main(p) {
+  if (p is! MyTypeName) {
+    return;
+  }
+  MyTypeName myTypeName = p;
+}
+''';
+    assertHasAssistAt(
+        'is! MyType', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
+    _assertLinkedGroup(change.linkedEditGroups[0], [
+      'myTypeName = '
+    ], expectedSuggestions(
+        LinkedEditSuggestionKind.VARIABLE, ['myTypeName', 'typeName', 'name']));
+    // another good location
+    assertHasAssistAt('if (p', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
+  }
+
   void test_introduceLocalTestedType_OK_while() {
     resolveTestUnit('''
 main(p) {
   while (p is String) {
   }
   p = null;
 }
 ''');
     String expected = '''
 main(p) {
@@ skipping 1246 matching lines @@
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 
   void _setStartEndSelection() {
     offset = findOffset('// start\n') + '// start\n'.length;
     length = findOffset('// end') - offset;
   }
 }