Fix SLOT002 (subclasses of collections.namedtuple() should define `__slots__`)

pyproject.toml

@@ -274,8 +274,6 @@ ignore = [
     "SIM115", # use context handler for opening files
     "SIM117", # use single 'with' statement
     "SIM118", # use key in dict not key in dict.keys()
-    # flake8-slots
-    "SLOT002",  # Subclasses of collections.namedtuple() should define __slots__
     # flake8-self
     "SLF001",  # private member accessed
     # flake8-print

tests/test_search.py

@@ -2,7 +2,6 @@
 
 import json
 import warnings
-from collections import namedtuple
 from io import BytesIO
 
 import pytest
@@ -12,12 +11,19 @@ from docutils.parsers import rst
 from sphinx.search import IndexBuilder
 
 
-class DummyEnvironment(namedtuple('DummyEnvironment', ['version', 'domains'])):
+class DummyEnvironment:
+    def __init__(self, version, domains):
+        self.version = version
+        self.domains = domains
+
     def __getattr__(self, name):
         if name.startswith('_search_index_'):
             setattr(self, name, {})
         return getattr(self, name, {})
 
+    def __str__(self):
+        return f'DummyEnvironment({self.version!r}, {self.domains!r})'
+
 
 class DummyDomain:
     def __init__(self, data):