def METHOD_NAME(self):
    """test if compare with 2 valid languages uses the correct templates"""
    url = reverse('index') + \
        '?concept=data_types&lang=python%3B3&lang=java%3B17'
    response = self.client.get(url)
    self.assertEqual(response.status_code, 200)
    self.assertTemplateUsed(response, 'concepts.html')
    self.assertTemplateUsed(response, 'base.html')