merge to trunk all changes from 36817 until 37378 under the packages: polymer,

pkg/polymer_expressions/test/eval_test.dart

Index: pkg/polymer_expressions/test/eval_test.dart
===================================================================
--- pkg/polymer_expressions/test/eval_test.dart	(revision 37373)
+++ pkg/polymer_expressions/test/eval_test.dart	(working copy)
@@ -92,6 +92,13 @@
       expectEval('1 != 2', true);
       expectEval('1 != null', true);
 
+      var x = {};
+      var y = {};
+      expectEval('x === y', true, null, {'x': x, 'y': x});
+      expectEval('x !== y', false, null, {'x': x, 'y': x});
+      expectEval('x === y', false, null, {'x': x, 'y': y});
+      expectEval('x !== y', true, null, {'x': x, 'y': y});
+
       expectEval('1 > 1', false);
       expectEval('1 > 2', false);
       expectEval('2 > 1', true);
@@ -418,12 +425,16 @@
 Object evalString(String s, [Object model, Map vars]) =>
     eval(new Parser(s).parse(), new Scope(model: model, variables: vars));
 
-expectEval(String s, dynamic matcher, [Object model, Map vars = const {}]) =>
-    expect(
-        eval(new Parser(s).parse(), new Scope(model: model, variables: vars)),
-        matcher,
-        reason: s);
+expectEval(String s, dynamic matcher, [Object model, Map vars = const {}]) {
+  var expr = new Parser(s).parse();
+  var scope = new Scope(model: model, variables: vars);
+  expect(eval(expr, scope), matcher, reason: s);
 
+  var observer = observe(expr, scope);
+  new Updater(scope).visit(observer);
+  expect(observer.currentValue, matcher, reason: s);
+}
+
 expectObserve(String s, {
     Object model,
     Map variables: const {},