[RonnyPfannschmidt]

Requested by Ronny · project thread

🤖 Written by Claude Opus 5.5 via Claude Code for the pytest maintainers; I prompted it, it did the work, I read it.

Before: three deprecations that exist only on main use PytestRemovedIn10Warning. With the next release planned as 10.0 (#15200), which turns those warnings into errors, they would go from not existing straight to an error.

After: they use a new PytestRemovedIn11Warning, so 10.0 ships them as warnings and 11.0 removes them:

• module/package/session-scoped fixtures defined as instance methods, from Extend instance method fixture deprecation to all higher scopes #14774 (class-scoped ones were deprecated in 9.1 and stay on pytest 10)
• non-string values for string-typed ini options, from fix config: add deprecation warning for non-string value in string-typed ini option #14811
• the _pytest.python.CallSpec2 alias, from python: rename CallSpec2 -> CallSpec #14742

All deprecations released in 9.1 or earlier stay scheduled for pytest 10.

How: add and export the warning class, add a HIGHER_SCOPED_FIXTURE_INSTANCE_METHOD warning that reuses the class-scope message and is picked by fixture scope, and update docs, tests and the unreleased changelog fragments. Also fixes two wrong .. deprecated:: versions in deprecations.rst: config.inicfg was deprecated in 9.1 (not 9.0), and the CallSpec2 alias is unreleased (not 9.1).

Coverage of the warning sites

Checked by running the full test suite under coverage on this branch and looking up every line in src/_pytest that emits a constant from _pytest/deprecated.py.

Moved to pytest 11, all covered:

Warning	Emit site	Covered by
CLASS_FIXTURE_INSTANCE_METHOD / HIGHER_SCOPED_FIXTURE_INSTANCE_METHOD	fixtures.py resolve_fixture_function (scope pick and __tracebackhide__)	deprecated_test.py::test_higher_scope_instance_method_is_deprecated (class → In10, module/package/session → In11)
INI_STRING_TYPE_NON_STR_VALUE	config/__init__.py _getini	test_config.py::TestConfigAPI::test_addini_string_non_str_deprecated
CALLSPEC2_RENAMED	python.py module __getattr__	deprecated_test.py::test_callspec2_renamed

Staying on pytest 10: every emit site is covered except MONKEYPATCH_LEGACY_NAMESPACE_PACKAGES (monkeypatch.py). Its only test, test_monkeypatch.py::test_syspath_prepend_with_namespace_packages, does importorskip("pkg_resources") and was skipped locally because the installed setuptools has no pkg_resources. I did not check whether any CI job installs it. Codecov patch is green for this PR.

Affected open PRs

• Deprecate registering command line options with required=True #15161 adds the same PytestRemovedIn11Warning class (plus export and reference docs). Whichever merges second has to drop its copy.
• Let conftest.py skip its directory only with pytest.importorskip #15143 (CONFTEST_IMPORT_SKIP) and Deprecate passing bytes to TerminalReporter.write_line #15202 (TERMINAL_WRITE_LINE_BYTES) add new deprecations with PytestRemovedIn10Warning. They are unreleased, so they should use PytestRemovedIn11Warning once this lands.
• Emit deprecations through WarningTemplate.warn; fix the instance #14931 missed #15137 renames UnformattedWarning to WarningTemplate across _pytest/deprecated.py, including INI_STRING_TYPE_NON_STR_VALUE, so the two PRs conflict textually. WarningTemplate keeps the .template attribute that HIGHER_SCOPED_FIXTURE_INSTANCE_METHOD reads, so resolving it is mechanical.
• Slate yield_fixture decorator for removal in pytest 10 #14755 (merged) moved yield_fixture to PytestRemovedIn10Warning after 9.1. That deprecation itself is from 6.2, so it stays on 10 here. Whether it should move is an open question.