test_cache_writefail_permissions: ignore any other plugins

Author: blueyed

testing/test_cacheprovider.py

@@ -59,7 +59,8 @@ def test_cache_writefail_permissions(self, testdir):
     @pytest.mark.filterwarnings(
         "ignore:could not create cache path:pytest.PytestWarning"
     )
-    def test_cache_failure_warns(self, testdir):
+    def test_cache_failure_warns(self, testdir, monkeypatch):
+        monkeypatch.setenv("PYTEST_DISABLE_PLUGIN_AUTOLOAD", "1")
         cache_dir = str(testdir.tmpdir.ensure_dir(".pytest_cache"))
         mode = os.stat(cache_dir)[stat.ST_MODE]
         testdir.tmpdir.ensure_dir(".pytest_cache").chmod(0)