Remove verifyClass() from get_spider_loader().

scrapy/spiderloader.py

@@ -6,7 +6,6 @@ from collections import defaultdict
 from typing import TYPE_CHECKING, Protocol, cast
 
 from zope.interface import implementer
-from zope.interface.verify import verifyClass
 
 from scrapy.interfaces import ISpiderLoader
 from scrapy.utils.misc import load_object, walk_modules_iter
@@ -26,7 +25,6 @@ def get_spider_loader(settings: BaseSettings) -> SpiderLoaderProtocol:
     """Get SpiderLoader instance from settings"""
     cls_path = settings.get("SPIDER_LOADER_CLASS")
     loader_cls = load_object(cls_path)
-    verifyClass(ISpiderLoader, loader_cls)
     return cast("SpiderLoaderProtocol", loader_cls.from_settings(settings.frozencopy()))
 
 

tests/test_crawler.py

@@ -10,7 +10,6 @@ from typing import TYPE_CHECKING, Any, ClassVar
 from unittest.mock import MagicMock
 
 import pytest
-from zope.interface.exceptions import MultipleInvalid
 
 import scrapy
 from scrapy import Spider
@@ -586,21 +585,7 @@ class TestCrawlerLogging:
         assert "debug message" in logged
 
 
-class SpiderLoaderWithWrongInterface:
-    def unneeded_method(self) -> None:
-        pass
-
-
 class TestCrawlerRunner(TestBaseCrawler):
-    def test_spider_manager_verify_interface(self) -> None:
-        settings = Settings(
-            {
-                "SPIDER_LOADER_CLASS": SpiderLoaderWithWrongInterface,
-            }
-        )
-        with pytest.raises(MultipleInvalid):
-            CrawlerRunner(settings)
-
     def test_crawler_runner_accepts_dict(self) -> None:
         runner = CrawlerRunner({"foo": "bar"})
         assert runner.settings["foo"] == "bar"
@@ -612,15 +597,6 @@ class TestCrawlerRunner(TestBaseCrawler):
 
 
 class TestAsyncCrawlerRunner(TestBaseCrawler):
-    def test_spider_manager_verify_interface(self) -> None:
-        settings = Settings(
-            {
-                "SPIDER_LOADER_CLASS": SpiderLoaderWithWrongInterface,
-            }
-        )
-        with pytest.raises(MultipleInvalid):
-            AsyncCrawlerRunner(settings)
-
     def test_crawler_runner_accepts_dict(self) -> None:
         runner = AsyncCrawlerRunner({"foo": "bar"})
         assert runner.settings["foo"] == "bar"