local code completion computer improvements

pkg/analysis_services/test/completion/local_computer_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.completion.dart.local;
 
 import 'package:analysis_services/src/completion/local_computer.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
 import 'completion_test_util.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(LocalComputerTest);
 }
 
 @ReflectiveTestCase()
 class LocalComputerTest extends AbstractCompletionTest {
 
   @override
   void setUp() {
     super.setUp();
     computer = new LocalComputer();
   }
 
   test_block() {
-    addTestSource('class A {a() {var f; ^ var g;}}');
+    addTestSource('class A {a() {var f; {var x;} ^ var g;}}');
     expect(computeFast(), isTrue);
     assertSuggestVariable('f');
     assertNotSuggested('g');
+    assertNotSuggested('x');
   }
 
   test_catch() {
     addTestSource('class A {a() {try{} catch (e) {^}}}');
     expect(computeFast(), isTrue);
     assertSuggestParameter('e');
   }
 
   test_catch2() {
     addTestSource('class A {a() {try{} catch (e, s) {^}}}');
@@ skipping 51 matching lines @@
     assertSuggestParameter('y');
   }
 
   test_methodParam_positional() {
     addTestSource('class A {a(x, [y=1]) {^}}');
     expect(computeFast(), isTrue);
     assertSuggestMethodName('a');
     assertSuggestParameter('x');
     assertSuggestParameter('y');
   }
-}
+
+  test_variableDeclaration() {
+    addTestSource('main() {int a = 1, b = 2 + ^;}');
+    expect(computeFast(), isTrue);
+    assertSuggestVariable('a');
+    assertNotSuggested('b');
+  }
+}
+