officially support python 3.14 (#13440)

* test on py3.14

* add news

* add 314 to tox.ini

* fix ResourceWarning on pastebin http failures

* fix ResourceWarning on pytest.raises with urllib.error

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* pass real types for HTTPError so it works in cmgr

* xfail test_raises_bdbquit_with_eoferror

* fix message for unraisable exceptions

* use improved prog default value for argparse.ArgumentParser

* Update testing/python/raises.py

* Update testing/test_debugging.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* be more explicit in debugging xfail

* Update changelog/13308.improvement.rst

Co-authored-by: Bruno Oliveira <bruno@soliv.dev>

* Update src/_pytest/pastebin.py

* add 3.14 trove classifier

* patch coverage

* Update .github/workflows/test.yml

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: jakkdl <h6+github@pm.me>
Co-authored-by: Bruno Oliveira <bruno@soliv.dev>

Author: 4 people

.github/workflows/test.yml

@@ -118,6 +118,10 @@ jobs:
             os: windows-latest
             tox_env: "py313"
 
+          - name: "windows-py314"
+            python: "3.14"
+            os: windows-latest
+            tox_env: "py314"
 
           - name: "ubuntu-py39-lsof-numpy-pexpect"
             python: "3.9"
@@ -163,6 +167,12 @@ jobs:
             tox_env: "py313-pexpect"
             use_coverage: true
 
+          - name: "ubuntu-py314"
+            python: "3.14"
+            os: ubuntu-latest
+            tox_env: "py314"
+            use_coverage: true
+
           - name: "ubuntu-pypy3-xdist"
             python: "pypy-3.9"
             os: ubuntu-latest
@@ -190,6 +200,10 @@ jobs:
             os: macos-latest
             tox_env: "py313-xdist"
 
+          - name: "macos-py314"
+            python: "3.14"
+            os: macos-latest
+            tox_env: "py314-xdist"
 
           - name: "plugins"
             python: "3.12"
@@ -239,7 +253,8 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python }}
-        check-latest: ${{ endsWith(matrix.python, '-dev') }}
+        check-latest: true
+        allow-prereleases: true
 
     - name: Install dependencies
       run: |

changelog/13308.improvement.rst

@@ -0,0 +1 @@
+Added official support for Python 3.14.

pyproject.toml

@@ -38,6 +38,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Software Development :: Libraries",
     "Topic :: Software Development :: Testing",
     "Topic :: Utilities",
@@ -349,7 +350,7 @@ ignore = "W009"
 
 [tool.pyproject-fmt]
 indent = 4
-max_supported_python = "3.13"
+max_supported_python = "3.14"
 
 [tool.pytest.ini_options]
 minversion = "2.0"

src/_pytest/pastebin.py

@@ -76,6 +76,7 @@ def create_new_paste(contents: str | bytes) -> str:
     :returns: URL to the pasted contents, or an error message.
     """
     import re
+    from urllib.error import HTTPError
     from urllib.parse import urlencode
     from urllib.request import urlopen
 
@@ -85,8 +86,11 @@ def create_new_paste(contents: str | bytes) -> str:
         response: str = (
             urlopen(url, data=urlencode(params).encode("ascii")).read().decode("utf-8")
         )
-    except OSError as exc_info:  # urllib errors
-        return f"bad response: {exc_info}"
+    except HTTPError as e:
+        with e:  # HTTPErrors are also http responses that must be closed!
+            return f"bad response: {e}"
+    except OSError as e:  # eg urllib.error.URLError
+        return f"bad response: {e}"
     m = re.search(r'href="/raw/(\w+)"', response)
     if m:
         return f"{url}/show/{m.group(1)}"

testing/python/raises.py

@@ -1,6 +1,7 @@
 # mypy: allow-untyped-defs
 from __future__ import annotations
 
+import io
 import re
 import sys
 
@@ -399,7 +400,11 @@ def test_issue_11872(self) -> None:
 
         https://github.com/python/cpython/issues/98778
         """
+        from email.message import Message
         from urllib.error import HTTPError
 
-        with pytest.raises(HTTPError, match="Not Found"):
-            raise HTTPError(code=404, msg="Not Found", fp=None, hdrs=None, url="")  # type: ignore [arg-type]
+        with pytest.raises(HTTPError, match="Not Found") as exc_info:
+            raise HTTPError(
+                code=404, msg="Not Found", fp=io.BytesIO(), hdrs=Message(), url=""
+            )
+        exc_info.value.close()  # avoid a resource warning

testing/test_debugging.py

@@ -1373,6 +1373,10 @@ def do_quit(self, *args):
     result.stdout.fnmatch_lines(["*runcall_called*", "* 1 passed in *"])
 
 
+@pytest.mark.xfail(
+    sys.version_info >= (3, 14),
+    reason="C-D now quits the test session, rather than failing the test. See https://github.com/python/cpython/issues/124703",
+)
 def test_raises_bdbquit_with_eoferror(pytester: Pytester) -> None:
     """It is not guaranteed that DontReadFromInput's read is called."""
     p1 = pytester.makepyfile(
@@ -1387,6 +1391,7 @@ def test(monkeypatch):
         """
     )
     result = pytester.runpytest(str(p1))
+    result.assert_outcomes(failed=1)
     result.stdout.fnmatch_lines(["E *BdbQuit", "*= 1 failed in*"])
     assert result.ret == 1
 

testing/test_parseopt.py

@@ -28,7 +28,7 @@ def test_no_help_by_default(self) -> None:
 
     def test_custom_prog(self, parser: parseopt.Parser) -> None:
         """Custom prog can be set for `argparse.ArgumentParser`."""
-        assert parser._getparser().prog == os.path.basename(sys.argv[0])
+        assert parser._getparser().prog == argparse.ArgumentParser().prog
         parser.prog = "custom-prog"
         assert parser._getparser().prog == "custom-prog"
 

testing/test_pastebin.py

@@ -3,6 +3,7 @@
 
 import email.message
 import io
+from unittest import mock
 
 from _pytest.monkeypatch import MonkeyPatch
 from _pytest.pytester import Pytester
@@ -90,23 +91,6 @@ class TestPaste:
     def pastebin(self, request):
         return request.config.pluginmanager.getplugin("pastebin")
 
-    @pytest.fixture
-    def mocked_urlopen_fail(self, monkeypatch: MonkeyPatch):
-        """Monkeypatch the actual urlopen call to emulate a HTTP Error 400."""
-        calls = []
-
-        import urllib.error
-        import urllib.request
-
-        def mocked(url, data):
-            calls.append((url, data))
-            raise urllib.error.HTTPError(
-                url, 400, "Bad request", email.message.Message(), io.BytesIO()
-            )
-
-        monkeypatch.setattr(urllib.request, "urlopen", mocked)
-        return calls
-
     @pytest.fixture
     def mocked_urlopen_invalid(self, monkeypatch: MonkeyPatch):
         """Monkeypatch the actual urlopen calls done by the internal plugin
@@ -158,10 +142,33 @@ def test_pastebin_invalid_url(self, pastebin, mocked_urlopen_invalid) -> None:
         )
         assert len(mocked_urlopen_invalid) == 1
 
-    def test_pastebin_http_error(self, pastebin, mocked_urlopen_fail) -> None:
-        result = pastebin.create_new_paste(b"full-paste-contents")
+    def test_pastebin_http_error(self, pastebin) -> None:
+        import urllib.error
+
+        with mock.patch(
+            "urllib.request.urlopen",
+            side_effect=urllib.error.HTTPError(
+                url="https://bpa.st",
+                code=400,
+                msg="Bad request",
+                hdrs=email.message.Message(),
+                fp=io.BytesIO(),
+            ),
+        ) as mock_urlopen:
+            result = pastebin.create_new_paste(b"full-paste-contents")
         assert result == "bad response: HTTP Error 400: Bad request"
-        assert len(mocked_urlopen_fail) == 1
+        assert len(mock_urlopen.mock_calls) == 1
+
+    def test_pastebin_url_error(self, pastebin) -> None:
+        import urllib.error
+
+        with mock.patch(
+            "urllib.request.urlopen",
+            side_effect=urllib.error.URLError("the url was bad"),
+        ) as mock_urlopen:
+            result = pastebin.create_new_paste(b"full-paste-contents")
+        assert result == "bad response: <urlopen error the url was bad>"
+        assert len(mock_urlopen.mock_calls) == 1
 
     def test_create_new_paste(self, pastebin, mocked_urlopen) -> None:
         result = pastebin.create_new_paste(b"full-paste-contents")

testing/test_unraisableexception.py

@@ -12,6 +12,24 @@
 
 PYPY = hasattr(sys, "pypy_version_info")
 
+UNRAISABLE_LINE = (
+    (
+        "  * PytestUnraisableExceptionWarning: Exception ignored while calling "
+        "deallocator <function BrokenDel.__del__ at *>: None"
+    )
+    if sys.version_info >= (3, 14)
+    else "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>"
+)
+
+TRACEMALLOC_LINES = (
+    ()
+    if sys.version_info >= (3, 14)
+    else (
+        "  Enable tracemalloc to get traceback where the object was allocated.",
+        "  See https* for more info.",
+    )
+)
+
 
 @pytest.mark.skipif(PYPY, reason="garbage-collection differences make this flaky")
 @pytest.mark.filterwarnings("default::pytest.PytestUnraisableExceptionWarning")
@@ -36,13 +54,12 @@ def test_2(): pass
         [
             "*= warnings summary =*",
             "test_it.py::test_it",
-            "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>",
+            UNRAISABLE_LINE,
             "  ",
             "  Traceback (most recent call last):",
             "  ValueError: del is broken",
             "  ",
-            "  Enable tracemalloc to get traceback where the object was allocated.",
-            "  See https* for more info.",
+            *TRACEMALLOC_LINES,
             "    warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))",
         ]
     )
@@ -75,13 +92,12 @@ def test_2(): pass
         [
             "*= warnings summary =*",
             "test_it.py::test_it",
-            "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>",
+            UNRAISABLE_LINE,
             "  ",
             "  Traceback (most recent call last):",
             "  ValueError: del is broken",
             "  ",
-            "  Enable tracemalloc to get traceback where the object was allocated.",
-            "  See https* for more info.",
+            *TRACEMALLOC_LINES,
             "    warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))",
         ]
     )
@@ -115,13 +131,12 @@ def test_2(): pass
         [
             "*= warnings summary =*",
             "test_it.py::test_it",
-            "  * PytestUnraisableExceptionWarning: Exception ignored in: <function BrokenDel.__del__ at *>",
+            UNRAISABLE_LINE,
             "  ",
             "  Traceback (most recent call last):",
             "  ValueError: del is broken",
             "  ",
-            "  Enable tracemalloc to get traceback where the object was allocated.",
-            "  See https* for more info.",
+            *TRACEMALLOC_LINES,
             "    warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))",
         ]
     )

tox.ini

@@ -9,6 +9,7 @@ envlist =
     py311
     py312
     py313
+    py314
     pypy3
     py39-{pexpect,xdist,unittestextras,numpy,pluggymain,pylib}
     doctesting