Add native_testing library to mock @Native classes

tests/compiler/dart2js_native/browser_compat_2_test.dart

Index: tests/compiler/dart2js_native/browser_compat_2_test.dart
diff --git a/tests/compiler/dart2js_native/browser_compat_2_test.dart b/tests/compiler/dart2js_native/browser_compat_2_test.dart
index eeb87fa28d16f726cbf96995a838628af12d01f9..e659ce48075b8520af06874d77a479083e84b524 100644
--- a/tests/compiler/dart2js_native/browser_compat_2_test.dart
+++ b/tests/compiler/dart2js_native/browser_compat_2_test.dart
@@ -2,8 +2,7 @@
 // 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.
 
-import "dart:_js_helper";
-import "package:expect/expect.dart";
+import "native_testing.dart";
 
 // Test for dartNativeDispatchHooksTransformer
 //  - uncached, instance, leaf and interior caching modes.
@@ -63,6 +62,11 @@ makeT1B = function(){return new T1B;};
 makeT1C = function(){return new T1C;};
 makeT1D = function(){return new T1D;};
 
+self.nativeConstructor(T1A);
+self.nativeConstructor(T1B);
+self.nativeConstructor(T1C);
+self.nativeConstructor(T1D);
+
 var getTagCount = 0;
 getTagCallCount = function() { return getTagCount; }
 clearTagCallCount = function() { getTagCount = 0; }
@@ -99,11 +103,9 @@ function transformer2(hooks) {
 dartNativeDispatchHooksTransformer = [transformer1, transformer2];
 ''';
 
-var inscrutable;
-
 main() {
+  nativeTesting();
   setup();
-  inscrutable = (x) => x;
 
   var t1a = makeT1A();
   var t1b = makeT1B();
@@ -111,17 +113,17 @@ main() {
   var t1d = makeT1D();
 
   clearTagCallCount();
-  Expect.equals("aA", inscrutable(t1a).foo(), 't1a is T1A');
-  Expect.equals("bB", inscrutable(t1b).foo(), 't1b is T1B');
-  Expect.equals("cC", inscrutable(t1c).foo(), 't1c is T1C');
-  Expect.equals("dD", inscrutable(t1d).foo(), 't1d is T1D');
+  Expect.equals("aA", confuse(t1a).foo(), 't1a is T1A');
+  Expect.equals("bB", confuse(t1b).foo(), 't1b is T1B');
+  Expect.equals("cC", confuse(t1c).foo(), 't1c is T1C');
+  Expect.equals("dD", confuse(t1d).foo(), 't1d is T1D');
   Expect.equals(4, getTagCallCount(), '4 fresh instances / types');
 
   clearTagCallCount();
-  Expect.equals("aA", inscrutable(t1a).foo(), 't1a is T1A');
-  Expect.equals("bB", inscrutable(t1b).foo(), 't1b is T1B');
-  Expect.equals("cC", inscrutable(t1c).foo(), 't1c is T1C');
-  Expect.equals("dD", inscrutable(t1d).foo(), 't1d is T1D');
+  Expect.equals("aA", confuse(t1a).foo(), 't1a is T1A');
+  Expect.equals("bB", confuse(t1b).foo(), 't1b is T1B');
+  Expect.equals("cC", confuse(t1c).foo(), 't1c is T1C');
+  Expect.equals("dD", confuse(t1d).foo(), 't1d is T1D');
   Expect.equals(1, getTagCallCount(), '1 = 1 uncached + (3 cached)');
 
   t1a = makeT1A();
@@ -130,18 +132,18 @@ main() {
   t1d = makeT1D();
 
   clearTagCallCount();
-  Expect.equals("aA", inscrutable(t1a).foo(), 't1a is T1A');
-  Expect.equals("bB", inscrutable(t1b).foo(), 't1b is T1B');
-  Expect.equals("cC", inscrutable(t1c).foo(), 't1c is T1C');
-  Expect.equals("dD", inscrutable(t1d).foo(), 't1d is T1D');
+  Expect.equals("aA", confuse(t1a).foo(), 't1a is T1A');
+  Expect.equals("bB", confuse(t1b).foo(), 't1b is T1B');
+  Expect.equals("cC", confuse(t1c).foo(), 't1c is T1C');
+  Expect.equals("dD", confuse(t1d).foo(), 't1d is T1D');
   Expect.equals(2, getTagCallCount(),
       '2 = 1 fresh instance + 1 uncached (+ 2 proto cached)');
 
   clearTagCallCount();
-  Expect.equals("aA", inscrutable(t1a).foo(), 't1a is T1A');
-  Expect.equals("bB", inscrutable(t1b).foo(), 't1b is T1B');
-  Expect.equals("cC", inscrutable(t1c).foo(), 't1c is T1C');
-  Expect.equals("dD", inscrutable(t1d).foo(), 't1d is T1D');
+  Expect.equals("aA", confuse(t1a).foo(), 't1a is T1A');
+  Expect.equals("bB", confuse(t1b).foo(), 't1b is T1B');
+  Expect.equals("cC", confuse(t1c).foo(), 't1c is T1C');
+  Expect.equals("dD", confuse(t1d).foo(), 't1d is T1D');
   Expect.equals(1, getTagCallCount(),
       '1 = 2 proto cached + 1 instance cached + 1 uncached');
 }