cascade target fix and common test

pkg/analysis_server/test/services/completion/invocation_computer_test.dart

Index: pkg/analysis_server/test/services/completion/invocation_computer_test.dart
diff --git a/pkg/analysis_server/test/services/completion/invocation_computer_test.dart b/pkg/analysis_server/test/services/completion/invocation_computer_test.dart
index 0c57891567a7df640ad4fa81611fce89131f0e30..7aac5aceee328256ae3ed914e06985bb6f17e5aa 100644
--- a/pkg/analysis_server/test/services/completion/invocation_computer_test.dart
+++ b/pkg/analysis_server/test/services/completion/invocation_computer_test.dart
@@ -26,18 +26,6 @@ class InvocationComputerTest extends AbstractSelectorSuggestionTest {
     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