Add 'Add != null' quick fix.

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 3079 matching lines @@
     resolveTestUnit('''
 main(p) {
   p i s Null;
 }''');
     List<AnalysisError> errors = context.computeErrors(testSource);
     for (var error in errors) {
       _computeFixes(error);
     }
   }
 
+  void test_nonBoolCondition_addNotNull() {
+    resolveTestUnit('''
+main(String p) {
+  if (p) {
+    print(p);
+  }
+}
+''');
+    assertHasFix(
+        DartFixKind.ADD_NE_NULL,
+        '''
+main(String p) {
+  if (p != null) {
+    print(p);
+  }
+}
+''');
+  }
+
   void test_removeDeadCode_condition() {
     resolveTestUnit('''
 main(int p) {
   if (true || p > 5) {
     print(1);
   }
 }
 ''');
     assertHasFix(
         DartFixKind.REMOVE_DEAD_CODE,
@@ skipping 1403 matching lines @@
       int offset = resultCode.indexOf(search);
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 
   void _performAnalysis() {
     while (context.performAnalysisTask().hasMoreWork);
   }
 }