'Verify the request for retreiving imported issues.'

def test_imported_issues(self):

    i = self.instance.imported_issues(since='2015-03-15')
    self.get_next(i)
    self.session.get.assert_called_once_with(url_for('import/issues'), params={'per_page': 100, 'since': '2015-03-15'}, headers={'Accept': 'application/vnd.github.golden-comet-preview+json'})
