'``FlockerConfiguration.__init__`` raises a ``ConfigurationError``
if the supplied configuration is not a ``dict``.'

def test_error_on_config_not_dict(self):

    config = 'a    string'
    e = self.assertRaises(ConfigurationError, FlockerConfiguration, config)
    self.assertEqual(e.message, u'Application    configuration    must    be    a    dictionary,    got    str.')
