title: How to use AssertRaisesMessage() in Django tests
body: <p>I followed the <a href="https://docs.djangoproject.com/en/1.6/topics/testing/tools/#assertions" rel="noreferrer">Django doc</a> to write tests with assertRaisesMessage() but the problem is  the exception itself is raised when executing test (so, the test is not executed). 
  Note that the exception called is an exception I voluntarily raise in a method of my model (not in the view).</p>
  
  <pre><code>class MyTestCase(TestCase):
      def test_invertRewardState_view_fails_notmy_reward(self):
          self.client.login(email='gislaine@toto.com', password='azerty')
          resp = self.client.get(reverse(invertRewardState, args=(1,)))
          self.assertRaisesMessage(
              expected_exception=Exception,
              expected_message=EXC_NOT_YOURS,
              callable_obj=resp)
  </code></pre>
  
  <p>How Should I use AssertRaisesMessage() to let my test be executed without raising the Exception?
  Thanks.</p>
  
  <p><strong>EDIT</strong> : 
  After trying falsetru 1st solution, the problem is still the same. As soon as my test enters in the <code>resp = ...</code> part, view is called, then related model method is called and raises the exception.
  the full stack trace :</p>
  
  <pre><code>Traceback (most recent call last):
    File "/Users/walt/Code/hellodjango/clientizr/tests.py", line 338, in test_invertRewardState_view_fails_notmy_reward
      resp = self.client.get(reverse(invertRewardState, args=('1',)))
    File "/Users/walt/Code/hellodjango/venv/lib/python2.7/site-packages/django/test/client.py", line 473, in get
      response = super(Client, self).get(path, data=data, **extra)
    File "/Users/walt/Code/hellodjango/venv/lib/python2.7/site-packages/django/test/client.py", line 280, in get
      return self.request(**r)
    File "/Users/walt/Code/hellodjango/venv/lib/python2.7/site-packages/django/test/client.py", line 444, in request
      six.reraise(*exc_info)
    File "/Users/walt/Code/hellodjango/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 114, in get_response
      response = wrapped_callback(request, *callback_args, **callback_kwargs)
    File "/Users/walt/Code/hellodjango/venv/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 22, in _wrapped_view
      return view_func(request, *args, **kwargs)
    File "/Users/walt/Code/hellodjango/clientizr/views.py", line 234, in invertRewardState
      reward.invert_reward_state(request.user)
    File "/Users/walt/Code/hellodjango/clientizr/models.py", line 606, in invert_reward_state
      self.throw_error_if_not_owner_reward(cur_user)
    File "/Users/walt/Code/hellodjango/clientizr/models.py", line 587, in throw_error_if_not_owner_reward
      raise Exception(EXC_NOT_YOURS)
  Exception: Cet objet n'est pas le v\xf4tre
  </code></pre>