mojo: Start generating structs for python bindings

mojo/python/tests/bindings_constants_unittest.py

Index: mojo/python/tests/bindings_constants_unittest.py
diff --git a/mojo/python/tests/bindings_constants_unittest.py b/mojo/python/tests/bindings_constants_unittest.py
index ea8c651b9566d4175723f03581c33b03c90ffdce..85e97c602b5d734445d969d1eb06329672ed0515 100644
--- a/mojo/python/tests/bindings_constants_unittest.py
+++ b/mojo/python/tests/bindings_constants_unittest.py
@@ -26,3 +26,14 @@ class ConstantBindingsTest(unittest.TestCase):
     self.assertEquals(sample_service_mojom.FLOAT_NEGATIVE_INFINITY,
                       float('-inf'))
     self.assertTrue(math.isnan(sample_service_mojom.FLOAT_NA_N))
+
+  def testConstantOnStructGeneration(self):
+    self.assertEquals(sample_service_mojom.Foo.FOOBY, "Fooby")
+
+  def testStructImmutability(self):
+    with self.assertRaises(AttributeError):
+      sample_service_mojom.Foo.FOOBY = 0
+    with self.assertRaises(AttributeError):
+      del sample_service_mojom.Foo.FOOBY
+    with self.assertRaises(AttributeError):
+      sample_service_mojom.Foo.BAR = 1

[sdefresne, 2014/09/09 08:51:57]

Q: just to be sure, but this is testing that user cannot add new values to the
struct, right?

[qsr, 2014/09/09 08:55:10]

 Exactly.