Add native_testing library to mock @Native classes

tests/html/js_interop_constructor_name_test.dart

Index: tests/html/js_interop_constructor_name_test.dart
diff --git a/tests/html/js_interop_constructor_name_test.dart b/tests/html/js_interop_constructor_name_test.dart
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+// 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>());
+    });
+
+  });
+}