From 987c2ae4a964e45120c245235c9b0c49dc36b71f Mon Sep 17 00:00:00 2001
From: Vostretsov Nikita <whalebot.helmsman@gmail.com>
Date: Tue, 25 Dec 2018 09:13:09 +0000
Subject: [PATCH] test ip concurrency incompatibility with DAPQ

---
 tests/test_scheduler.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tests/test_scheduler.py b/tests/test_scheduler.py
index 9bdc82b30..17b706bd7 100644
--- a/tests/test_scheduler.py
+++ b/tests/test_scheduler.py
@@ -301,3 +301,20 @@ class TestIntegrationWithDownloaderAwareOnDisk(TestCase):
             yield self.crawler.crawl(slots)
             self.assertEqual(self.crawler.stats.get_value('downloader/response_count'),
                              len(slots))
+
+
+class TestIncompatibility(unittest.TestCase):
+
+    def _incompatible(self):
+        settings = dict(
+                SCHEDULER_PRIORITY_QUEUE='scrapy.pqueues.DownloaderAwarePriorityQueue',
+                CONCURRENT_REQUESTS_PER_IP=1
+                )
+        crawler = Crawler(Spider, settings)
+        scheduler = Scheduler.from_crawler(crawler)
+        spider = Spider(name='spider')
+        scheduler.open(spider)
+
+    def test_incompatibility(self):
+        with self.assertRaises(ValueError):
+            self._incompatible()