Fix getting annotations for _parse_sitemap() at the runtime. (#6671)

* Fix getting annotations for _parse_sitemap() at the runtime.

* Split off the callback annotations test.

scrapy/spiders/sitemap.py

@@ -2,6 +2,9 @@ from __future__ import annotations
 
 import logging
 import re
+
+# Iterable is needed at the run time for the SitemapSpider._parse_sitemap() annotation
+from collections.abc import Iterable, Sequence  # noqa: TC003
 from typing import TYPE_CHECKING, Any, cast
 
 from scrapy.http import Request, Response, XmlResponse
@@ -11,8 +14,6 @@ from scrapy.utils.gz import gunzip, gzip_magic_number
 from scrapy.utils.sitemap import Sitemap, sitemap_urls_from_robots
 
 if TYPE_CHECKING:
-    from collections.abc import Iterable, Sequence
-
     # typing.Self requires Python 3.11
     from typing_extensions import Self
 

tests/test_poet.py

@@ -0,0 +1,20 @@
+"""Tests that make sure parts needed for the scrapy-poet stack work."""
+
+from typing import get_type_hints
+
+from scrapy import Spider
+from scrapy.spiders import CrawlSpider, CSVFeedSpider, SitemapSpider, XMLFeedSpider
+
+
+def test_callbacks():
+    """Making sure annotations on all non-abstract callbacks can be resolved."""
+
+    for cb in [
+        Spider._parse,
+        CrawlSpider._parse,
+        CrawlSpider._callback,
+        XMLFeedSpider._parse,
+        CSVFeedSpider._parse,
+        SitemapSpider._parse_sitemap,
+    ]:
+        get_type_hints(cb)