Open Source Monorail

appengine/monorail/testing/test/fake_test.py

Index: appengine/monorail/testing/test/fake_test.py
diff --git a/appengine/monorail/testing/test/fake_test.py b/appengine/monorail/testing/test/fake_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..a58a44d6337fde15d5c928cb1384ddb12b741a74
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+++ b/appengine/monorail/testing/test/fake_test.py
@@ -0,0 +1,67 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is govered by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""Tests for the fake module."""
+
+import inspect
+import unittest
+
+from services import cachemanager_svc
+from services import config_svc
+from services import issue_svc
+from services import project_svc
+from services import star_svc
+from services import user_svc
+from services import usergroup_svc
+from testing import fake
+
+fake_class_map = {
+    fake.AbstractStarService: star_svc.AbstractStarService,
+    fake.CacheManager: cachemanager_svc.CacheManager,
+    fake.ProjectService: project_svc.ProjectService,
+    fake.ConfigService: config_svc.ConfigService,
+    fake.IssueService: issue_svc.IssueService,
+    fake.UserGroupService: usergroup_svc.UserGroupService,
+    fake.UserService: user_svc.UserService,
+    }
+
+
+class FakeMetaTest(unittest.TestCase):
+
+  def testFunctionsHaveSameSignatures(self):
+    """Verify that the fake class methods match the real ones."""
+    for fake_cls, real_cls in fake_class_map.iteritems():
+      fake_attrs = set(dir(fake_cls))
+      real_attrs = set(dir(real_cls))
+      both_attrs = fake_attrs.intersection(real_attrs)
+      to_test = [x for x in both_attrs if '__' not in x]
+      for name in to_test:
+        real_attr = getattr(real_cls, name)
+        if inspect.ismethod(real_attr):
+          real_spec = inspect.getargspec(real_attr)
+          fake_spec = inspect.getargspec(getattr(fake_cls, name))
+          # check same number of args and kwargs
+          real_kw_len = real_spec[3] and len(real_spec[3]) or 0
+          fake_kw_len = fake_spec[3] and len(fake_spec[3]) or 0
+
+          self.assertEquals(
+              len(real_spec[0]) - real_kw_len,
+              len(fake_spec[0]) - fake_kw_len,
+              'Unequal number of args on %s.%s' % (fake_cls.__name__, name))
+          self.assertEquals(
+              real_kw_len, fake_kw_len,
+              'Unequal number of kwargs on %s.%s' % (fake_cls.__name__, name))
+          if real_kw_len:
+            self.assertEquals(
+                real_spec[0][-real_kw_len:],
+                fake_spec[0][-fake_kw_len:],
+                'Mismatched kwargs on %s.%s' % (fake_cls.__name__, name))
+          self.assertEquals(
+              real_spec[3], fake_spec[3],
+              'Mismatched kwarg defaults on %s.%s' % (fake_cls.__name__, name))
+
+
+if __name__ == '__main__':
+  unittest.main()