Revert "Add native_testing library to mock @Native classes"

tests/html/js_interop_constructor_name_test.dart

-// Copyright (c) 2013, 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 jsTest;
-
-import 'dart:async';
-import 'dart:html' as html;
-import 'dart:js';
-import 'package:js/js.dart';
-
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
-import 'package:expect/expect.dart' show NoInline, AssumeDynamic;
-
-@JS()
-external makeDiv(String text);
-
-@JS()
-class HTMLDivElement {
-  external String bar();
-}
-
-@NoInline() @AssumeDynamic()
-confuse(x) => x;
-
-main() {
-  useHtmlIndividualConfiguration();
-
-  group('HTMLDivElement-types', () {
-    test('dom-is-dom', () {
-      var e = confuse(new html.DivElement());
-      expect(e is html.DivElement, isTrue);
-    });
-
-    test('js-is-dom', () {
-      var e = confuse(makeDiv('hello'));
-      expect(e is html.DivElement, isFalse);
-    });
-
-    test('js-is-js', () {
-      var e = confuse(makeDiv('hello'));
-      expect(e is HTMLDivElement, isTrue);
-    });
-
-  });
-
-  group('HTMLDivElement-types-erroneous1', () {
-    test('dom-is-js', () {
-      var e = confuse(new html.DivElement());
-      // TODO(26838): When Issue 26838 is fixed and this test passes, move this
-      // test into group `HTMLDivElement-types`.
-
-      // Currently, HTML types are not [JavaScriptObject]s. We could change that
-      // by having HTML types extend JavaScriptObject, in which case we would
-      // change this expectation.
-      expect(e is HTMLDivElement, isFalse);
-    });
-  });
-
-  group('HTMLDivElement-types-erroneous2', () {
-    test('String-is-not-js', () {
-      var e = confuse('kombucha');
-      // TODO(26838): When Issue 26838 is fixed and this test passes, move this
-      // test into group `HTMLDivElement-types`.
-
-      // A String should not be a JS interop type. The type test flags are added
-      // to Interceptor, but should be added to the class that implements all
-      // the JS-interop methods.
-      expect(e is HTMLDivElement, isFalse);
-    });
-  });
-
-
-  group('HTMLDivElement-methods', () {
-
-    test('js-call-js-method', () {
-      var e = confuse(makeDiv('hello'));
-      expect(e.bar(), equals('hello'));
-    });
-
-    test('dom-call-js-method', () {
-      var e = confuse(new html.DivElement());
-      expect(() => e.bar(), throws);
-    });
-
-    test('js-call-dom-method', () {
-      var e = confuse(makeDiv('hello'));
-      expect(() => e.clone(false), throws);
-    });
-
-    test('dom-call-dom-method', () {
-      var e = confuse(new html.DivElement());
-      expect(e.clone(false), new isInstanceOf<html.DivElement>());
-    });
-
-  });
-}