cascade target fix and common test

pkg/analysis_server/test/services/completion/invocation_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.invocation;
 
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/invocation_computer.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import 'completion_test_util.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(InvocationComputerTest);
 }
 
 @ReflectiveTestCase()
 class InvocationComputerTest extends AbstractSelectorSuggestionTest {
 
   @override
   void setUp() {
     super.setUp();
     computer = new InvocationComputer();
   }
 
-  test_CascadeExpression_target() {
-    // PropertyAccess  CascadeExpression  ExpressionStatement
-    addTestSource('''
-      class A {var b; X _c;}
-      class X{}
-      main() {A a; a^..b}''');
-    return computeFull().then((_) {
-      assertNotSuggested('b');
-      assertNotSuggested('_c');
-    });
-  }
-
   test_ConstructorName_importedClass() {
     // SimpleIdentifier  PrefixedIdentifier  TypeName  ConstructorName
     // InstanceCreationExpression
     addSource('/testB.dart', '''
       lib B;
       class X {X.c(); X._d(); z() {}}''');
     addTestSource('''
       import "/testB.dart";
       var m;
       main() {new X.^}''');
@@ skipping 205 matching lines @@
       class X {set y(X x) {} set _z(X x) {}}''');
     addTestSource('''
       import "/testB.dart";
       main() {X x; x.^}''');
     return computeFull().then((_) {
       assertSuggestSetter('y');
       assertNotSuggested('_z');
     });
   }
 }