mojo: Start generating structs for python bindings

mojo/python/tests/bindings_constants_unittest.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import math
 import unittest
 
 # Generated files
 # pylint: disable=F0401
 import sample_service_mojom
 
 
 class ConstantBindingsTest(unittest.TestCase):
 
   def testConstantGeneration(self):
     self.assertEquals(sample_service_mojom.TWELVE, 12)
     self.assertEquals(sample_service_mojom.TOO_BIG_FOR_SIGNED_INT64,
                       9999999999999999999)
     self.assertEquals(sample_service_mojom.DOUBLE_INFINITY,
                       float('inf'))
     self.assertEquals(sample_service_mojom.DOUBLE_NEGATIVE_INFINITY,
                       float('-inf'))
     self.assertTrue(math.isnan(sample_service_mojom.DOUBLE_NA_N))
     self.assertEquals(sample_service_mojom.FLOAT_INFINITY,
                       float('inf'))
     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.