diff --git a/tests/test_request_left.py b/tests/test_request_left.py
new file mode 100644
index 000000000..ddeca0499
--- /dev/null
+++ b/tests/test_request_left.py
@@ -0,0 +1,59 @@
+from twisted.internet import defer
+from twisted.trial.unittest import TestCase
+from scrapy.signals import request_left_downloader
+from scrapy.spiders import Spider
+from scrapy.utils.test import get_crawler
+from tests.mockserver import MockServer
+
+class SignalCatcherSpider(Spider):
+    name = 'signal_catcher'
+
+    def __init__(self, crawler, url, *args, **kwargs):
+        super(SignalCatcherSpider, self).__init__(*args, **kwargs)
+        crawler.signals.connect(self.on_response_download,
+                                signal=request_left_downloader)
+        self.catched_times = 0
+        self.start_urls = [url]
+
+    @classmethod
+    def from_crawler(cls, crawler, *args, **kwargs):
+        spider = cls(crawler, *args, **kwargs)
+        return spider
+
+    def on_response_download(self, request, spider):
+        self.catched_times = self.catched_times + 1
+
+
+class TestCatching(TestCase):
+
+    def setUp(self):
+        self.mockserver = MockServer()
+        self.mockserver.__enter__()
+
+    def tearDown(self):
+        self.mockserver.__exit__(None, None, None)
+
+    @defer.inlineCallbacks
+    def test_success(self):
+        crawler = get_crawler(SignalCatcherSpider)
+        yield crawler.crawl(self.mockserver.url("/status?n=200"))
+        self.assertEqual(crawler.spider.catched_times, 1)
+
+    @defer.inlineCallbacks
+    def test_timeout(self):
+        crawler = get_crawler(SignalCatcherSpider,
+                              {'DOWNLOAD_TIMEOUT': 0.1})
+        yield crawler.crawl(self.mockserver.url("/delay?n=0.2"))
+        self.assertEqual(crawler.spider.catched_times, 1)
+
+    @defer.inlineCallbacks
+    def test_disconnect(self):
+        crawler = get_crawler(SignalCatcherSpider)
+        yield crawler.crawl(self.mockserver.url("/drop"))
+        self.assertEqual(crawler.spider.catched_times, 1)
+
+    @defer.inlineCallbacks
+    def test_noconnect(self):
+        crawler = get_crawler(SignalCatcherSpider)
+        yield crawler.crawl('http://thereisdefinetelynosuchdomain.com')
+        self.assertEqual(crawler.spider.catched_times, 1)