Use JavaFile instead of Dart File.

pkg/analyzer-experimental/test/generated/element_test.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.element_test;
 
 import 'dart:collection';
 import 'dart:io';
 import 'package:analyzer-experimental/src/generated/java_core.dart';
 import 'package:analyzer-experimental/src/generated/java_engine.dart';
 import 'package:analyzer-experimental/src/generated/java_engine_io.dart';
@@ skipping 130 matching lines @@
   static dartSuite() {
     _ut.group('LibraryElementImplTest', () {
       _ut.test('test_creation', () {
         final __test = new LibraryElementImplTest();
         runJUnitTest(__test, __test.test_creation);
       });
       _ut.test('test_getImportedLibraries', () {
         final __test = new LibraryElementImplTest();
         runJUnitTest(__test, __test.test_getImportedLibraries);
       });
-//      _ut.test('test_getPrefixes', () {
-//        final __test = new LibraryElementImplTest();
-//        runJUnitTest(__test, __test.test_getPrefixes);
-//      });
+      _ut.test('test_getPrefixes', () {
+        final __test = new LibraryElementImplTest();
+        runJUnitTest(__test, __test.test_getPrefixes);
+      });
       _ut.test('test_setImports', () {
         final __test = new LibraryElementImplTest();
         runJUnitTest(__test, __test.test_setImports);
       });
     });
   }
 }
 class InterfaceTypeImplTest extends EngineTestCase {
   void test_computeLongestInheritancePathToObject_multipleInterfacePaths() {
     ClassElementImpl elementA = ElementFactory.classElement2("A", []);
@@ skipping 1237 matching lines @@
     JUnitTestCase.assertTrue(classElement.isAccessibleIn(library2));
   }
   void test_isAccessibleIn_public_sameLibrary() {
     LibraryElementImpl library17 = ElementFactory.library(new AnalysisContextImpl(), "lib");
     ClassElement classElement = ElementFactory.classElement2("C", []);
     ((library17.definingCompilationUnit as CompilationUnitElementImpl)).types = <ClassElement> [classElement];
     JUnitTestCase.assertTrue(classElement.isAccessibleIn(library17));
   }
   static dartSuite() {
     _ut.group('ElementImplTest', () {
-//      _ut.test('test_equals', () {
-//        final __test = new ElementImplTest();
-//        runJUnitTest(__test, __test.test_equals);
-//      });
+      _ut.test('test_equals', () {
+        final __test = new ElementImplTest();
+        runJUnitTest(__test, __test.test_equals);
+      });
       _ut.test('test_isAccessibleIn_private_differentLibrary', () {
         final __test = new ElementImplTest();
         runJUnitTest(__test, __test.test_isAccessibleIn_private_differentLibrary);
       });
       _ut.test('test_isAccessibleIn_private_sameLibrary', () {
         final __test = new ElementImplTest();
         runJUnitTest(__test, __test.test_isAccessibleIn_private_sameLibrary);
       });
       _ut.test('test_isAccessibleIn_public_differentLibrary', () {
         final __test = new ElementImplTest();
@@ skipping 463 matching lines @@
 }
 main() {
   FunctionTypeImplTest.dartSuite();
   InterfaceTypeImplTest.dartSuite();
   TypeVariableTypeImplTest.dartSuite();
   ClassElementImplTest.dartSuite();
   ElementLocationImplTest.dartSuite();
   ElementImplTest.dartSuite();
   LibraryElementImplTest.dartSuite();
 }