test: simplify mocks and localize test fixtures

Replace shared HTTPX and DNS fixtures with targeted unittest.mock
patches close to the tests that need them.

Keep conftest focused on application and client setup, while moving
receiver-specific helpers into the receiver test module.

1 files changed, 5 insertions, 13 deletions

diff --git a/tests/test_url_security.py b/tests/test_url_security.py
index fba6d7d..b10e6ff 100644
--- a/tests/test_url_security.py
+++ b/tests/test_url_security.py
@@ -1,3 +1,5 @@
+from unittest.mock import Mock, patch
+
 import pytest
 
 from webmentions_ssg.url_security import (
@@ -6,14 +8,7 @@ from webmentions_ssg.url_security import (
 )
 
 
-class FakeAnswers:
-    def __init__(self, *addresses: str):
-        self._addresses = addresses
-
-    def addresses(self):
-        return iter(self._addresses)
-
-
+@patch("webmentions_ssg.url_security.dns.resolver.resolve_name")
 @pytest.mark.parametrize(
     ("url", "resolved_addresses"),
     [
@@ -29,14 +24,11 @@ class FakeAnswers:
     ],
 )
 def test_ensure_public_url_rejects_non_public_addresses(
-    monkeypatch: pytest.MonkeyPatch,
+    resolve_name: Mock,
     url: str,
     resolved_addresses: list[str],
 ) -> None:
-    monkeypatch.setattr(
-        "webmentions_ssg.url_security.dns.resolver.resolve_name",
-        lambda hostname: FakeAnswers(*resolved_addresses),
-    )
+    resolve_name.return_value.addresses.return_value = resolved_addresses
 
     with pytest.raises(NonPublicAddressError):
         ensure_public_url(url)