Exchanging operands of a comparision operator should invert the operator.

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:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
@@ skipping 988 matching lines @@
 class A {
   bool get isEmpty => false;
 }
 main(A a) {
   !a.isEmpty;
 }
 ''');
     assertNoAssistAt('isEmpty;', AssistKind.CONVERT_INTO_IS_NOT_EMPTY);
   }
 
+  void test_exchangeBinaryExpressionArguments_OK_compare() {
+    Map<String, String> operatorMap = {
+      '<': '>=',
+      '<=': '>',
+      '>': '<=',
+      '>=': '<'
+    };
+    operatorMap.forEach((initialOperator, resultOperator) {
+      _indexTestUnit('''
+bool main(int a, int b) {
+  return a $initialOperator b;
+}
+''');
+      assertHasAssistAt(initialOperator, AssistKind.EXCHANGE_OPERANDS, '''
+bool main(int a, int b) {
+  return b $resultOperator a;
+}
+''');
+    });
+  }
+
   void test_exchangeBinaryExpressionArguments_OK_extended_mixOperator_1() {
     _indexTestUnit('''
 main() {
   1 * 2 * 3 + 4;
 }
 ''');
     assertHasAssistAt('* 2', AssistKind.EXCHANGE_OPERANDS, '''
 main() {
   2 * 3 * 1 + 4;
 }
@@ skipping 1564 matching lines @@
   void _indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 
   void _setStartEndSelection() {
     offset = findOffset('// start\n') + '// start\n'.length;
     length = findOffset('// end') - offset;
   }
 }