mojo: Generate top level enums for python bindings.

mojo/python/tests/bindings_enums_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 unittest
+
+# Generated files
+# pylint: disable=F0401
+import sample_import_mojom
+
+
+class EnumBindingsTest(unittest.TestCase):
+
+  # Testing that enum class have expected constant values.
+  def testTopLevelEnumGeneration(self):
+    self.assertEquals(sample_import_mojom.Shape.RECTANGLE, 1)
+    self.assertEquals(sample_import_mojom.Shape.CIRCLE, 2)
+    self.assertEquals(sample_import_mojom.Shape.TRIANGLE, 3)
+    self.assertEquals(sample_import_mojom.Shape.LAST,
+                      sample_import_mojom.Shape.TRIANGLE)
+
+    self.assertEquals(sample_import_mojom.AnotherShape.RECTANGLE, 10)
+    self.assertEquals(sample_import_mojom.AnotherShape.CIRCLE, 11)
+    self.assertEquals(sample_import_mojom.AnotherShape.TRIANGLE, 12)
+
+    self.assertEquals(sample_import_mojom.YetAnotherShape.RECTANGLE, 20)
+    self.assertEquals(sample_import_mojom.YetAnotherShape.CIRCLE, 21)
+    self.assertEquals(sample_import_mojom.YetAnotherShape.TRIANGLE, 22)
+
+  # Testing an enum class cannot be instantiated.
+  def testNonInstantiableEnum(self):
+    with self.assertRaises(TypeError):
+      sample_import_mojom.Shape()
+
+  # Testing an enum does not contain the VALUES constant.
+  def testNoVALUESConstant(self):
+    with self.assertRaises(AttributeError):
+      # pylint: disable=W0104
+      sample_import_mojom.Shape.VALUES
+
+  # Testing enum values are frozen.
+  def testEnumFrozen(self):
+    with self.assertRaises(AttributeError):
+      sample_import_mojom.Shape.RECTANGLE = 2
+    with self.assertRaises(AttributeError):
+      del sample_import_mojom.Shape.RECTANGLE
+    with self.assertRaises(AttributeError):
+      sample_import_mojom.Shape.NewShape = 4