Add completion tests for the new analysis driver.

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

Index: pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart b/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
index d212a5f01534361d377f28ac755568f6e52a74fe..f931c0d892931f68e91e0c3cb3cac5ca0eeb0781 100644
--- a/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
@@ -22,6 +22,7 @@ import 'completion_contributor_util.dart';
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(CompletionManagerTest);
+    defineReflectiveTests(CompletionManagerTest_Driver);
   });
 }
 
@@ -105,3 +106,16 @@ part '$testFile';
     assertImportedLib('/libA.dart');
   }
 }
+
+@reflectiveTest
+class CompletionManagerTest_Driver extends CompletionManagerTest {
+  @override
+  bool get enableNewAnalysisDriver => true;
+
+  @failingTest
+  @override
+  test_resolveDirectives() {
+//    Bad state: Should not be used with the new analysis driver.
+    return super.test_resolveDirectives();
+  }
+}