binary expression suggestion fix

pkg/analysis_server/test/services/completion/completion_test_util.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.completion.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol show Element,
     ElementKind;
@@ skipping 960 matching lines @@
       class X {X.c(); X._d(); z() {}}''');
     addTestSource('''
       import "/testB.dart";
       class Y {Y.c(); Y._d(); z() {}}
       main() {var ^}''');
     computeFast();
     return computeFull(true).then((_) {
       assertNoSuggestions();
     });
   }
+
+  test_BinaryExpression_LHS() {
+    // SimpleIdentifier  BinaryExpression  VariableDeclaration
+    // VariableDeclarationList  VariableDeclarationStatement
+    addTestSource('main() {int a = 1, b = ^ + 2;}');
+    computeFast();
+    return computeFull(true).then((_) {
+      assertSuggestLocalVariable('a', 'int');
+      assertSuggestImportedClass('Object');
+      assertNotSuggested('b');
+    });
+  }
+
+  test_BinaryExpression_RHS() {
+    // SimpleIdentifier  BinaryExpression  VariableDeclaration
+    // VariableDeclarationList  VariableDeclarationStatement
+    addTestSource('main() {int a = 1, b = 2 + ^;}');
+    computeFast();
+    return computeFull(true).then((_) {
+      assertSuggestLocalVariable('a', 'int');
+      assertSuggestImportedClass('Object');
+      assertNotSuggested('b');
+    });
+  }
 }