From 3fd67530516dcaa8ead0dc7bb2e29307b7a4fad5 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Wed, 4 Feb 2026 17:29:30 +0000
Subject: [PATCH 01/15] CI: make tests verbose [skip doc] [skip appveyor]

---
 .github/workflows/tests.yml | 30 +-----------------------------
 azure-pipelines.yml         |  2 +-
 2 files changed, 2 insertions(+), 30 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6f79beae1bd5..e22bc4a86009 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -47,34 +47,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name-suffix: "(Minimum Versions)"
-            os: ubuntu-22.04
-            python-version: '3.11'
-            extra-requirements: '-c requirements/testing/minver.txt'
-            delete-font-cache: true
-            # https://github.com/matplotlib/matplotlib/issues/29844
-            pygobject-ver: '<3.52.0'
-          - os: ubuntu-22.04
-            python-version: '3.11'
-            CFLAGS: "-fno-lto"  # Ensure that disabling LTO works.
-            extra-requirements: '-r requirements/testing/extra.txt'
-            # https://github.com/matplotlib/matplotlib/issues/29844
-            pygobject-ver: '<3.52.0'
-          - name-suffix: "(Extra TeX packages)"
-            os: ubuntu-22.04
-            python-version: '3.13'
-            extra-packages: 'texlive-fonts-extra texlive-lang-cyrillic'
-            # https://github.com/matplotlib/matplotlib/issues/29844
-            pygobject-ver: '<3.52.0'
-          - name-suffix: "Free-threaded"
-            os: ubuntu-22.04
-            python-version: '3.13t'
-            # https://github.com/matplotlib/matplotlib/issues/29844
-            pygobject-ver: '<3.52.0'
-          - os: ubuntu-24.04
-            python-version: '3.12'
-          - os: ubuntu-24.04
-            python-version: '3.14'
           - os: ubuntu-24.04-arm
             python-version: '3.12'
           - os: macos-14  # This runner is on M1 (arm64) chips.
@@ -336,7 +308,7 @@ jobs:
           if [[ "${{ matrix.python-version }}" == '3.13t' ]]; then
             export PYTHON_GIL=0
           fi
-          pytest -rfEsXR -n auto \
+          pytest -vrfEsXR -n auto \
             --maxfail=50 --timeout=300 --durations=25 \
             --cov-report=xml --cov=lib --log-level=DEBUG --color=yes
 
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index d68a9d36f0d3..5eb69258b671 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -120,7 +120,7 @@ stages:
 
               echo "##vso[task.setvariable variable=VS_COVERAGE_TOOL]$TOOL"
 
-              PYTHONFAULTHANDLER=1 pytest -rfEsXR -n 2 \
+              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 \
                   --maxfail=50 --timeout=300 --durations=25 \
                   --junitxml=junit/test-results.xml --cov-report=xml --cov=lib
 

From 775c698ed2f9347089a2289fa613570c3836bca0 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Thu, 5 Feb 2026 13:13:28 +0000
Subject: [PATCH 02/15] skip the streamplot test [skip doc] [skip appveyor]

---
 lib/matplotlib/tests/test_streamplot.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/matplotlib/tests/test_streamplot.py b/lib/matplotlib/tests/test_streamplot.py
index 697ee527f253..8ea9ba9ea785 100644
--- a/lib/matplotlib/tests/test_streamplot.py
+++ b/lib/matplotlib/tests/test_streamplot.py
@@ -100,6 +100,7 @@ def test_direction():
                    linewidth=2, density=2)
 
 
+@pytest.mark.skip(reason='Eliminating test from enquiries')
 @image_comparison(['streamplot_integration.png'], style='mpl20', tol=0.05)
 def test_integration_options():
     # Linear potential flow over a lifting cylinder

From efc6e4969a8ec633d3d19dcded4ddcb36deb0af2 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Fri, 6 Feb 2026 11:44:05 +0000
Subject: [PATCH 03/15] run with single worker [skip doc] [skip appveyor]

---
 .github/workflows/tests.yml             | 2 +-
 azure-pipelines.yml                     | 2 +-
 lib/matplotlib/tests/test_streamplot.py | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e22bc4a86009..c97be0202510 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -308,7 +308,7 @@ jobs:
           if [[ "${{ matrix.python-version }}" == '3.13t' ]]; then
             export PYTHON_GIL=0
           fi
-          pytest -vrfEsXR -n auto \
+          pytest -vrfEsXR \
             --maxfail=50 --timeout=300 --durations=25 \
             --cov-report=xml --cov=lib --log-level=DEBUG --color=yes
 
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 5eb69258b671..1e39c0f12156 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -120,7 +120,7 @@ stages:
 
               echo "##vso[task.setvariable variable=VS_COVERAGE_TOOL]$TOOL"
 
-              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 \
+              PYTHONFAULTHANDLER=1 pytest -vrfEsXR \
                   --maxfail=50 --timeout=300 --durations=25 \
                   --junitxml=junit/test-results.xml --cov-report=xml --cov=lib
 
diff --git a/lib/matplotlib/tests/test_streamplot.py b/lib/matplotlib/tests/test_streamplot.py
index 8ea9ba9ea785..ca7843f72b58 100644
--- a/lib/matplotlib/tests/test_streamplot.py
+++ b/lib/matplotlib/tests/test_streamplot.py
@@ -100,7 +100,7 @@ def test_direction():
                    linewidth=2, density=2)
 
 
-@pytest.mark.skip(reason='Eliminating test from enquiries')
+# @pytest.mark.skip(reason='Eliminating test from enquiries')
 @image_comparison(['streamplot_integration.png'], style='mpl20', tol=0.05)
 def test_integration_options():
     # Linear potential flow over a lifting cylinder

From 23b376ca513ff0c18e9175f54803400baa30e1b8 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Fri, 6 Feb 2026 19:19:06 +0000
Subject: [PATCH 04/15] try GHA with two workers [skip doc] [skip appveyor]

---
 .github/workflows/tests.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c97be0202510..7e95dc3229dd 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -308,7 +308,7 @@ jobs:
           if [[ "${{ matrix.python-version }}" == '3.13t' ]]; then
             export PYTHON_GIL=0
           fi
-          pytest -vrfEsXR \
+          pytest -vrfEsXR -n 2 \
             --maxfail=50 --timeout=300 --durations=25 \
             --cov-report=xml --cov=lib --log-level=DEBUG --color=yes
 

From 824f6649dd20dab9c0eb08f529c667242fa68a0d Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Fri, 6 Feb 2026 22:35:23 +0000
Subject: [PATCH 05/15] back to two workers on Azure [skip doc] [skip appveyor]

---
 azure-pipelines.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 1e39c0f12156..5eb69258b671 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -120,7 +120,7 @@ stages:
 
               echo "##vso[task.setvariable variable=VS_COVERAGE_TOOL]$TOOL"
 
-              PYTHONFAULTHANDLER=1 pytest -vrfEsXR \
+              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 \
                   --maxfail=50 --timeout=300 --durations=25 \
                   --junitxml=junit/test-results.xml --cov-report=xml --cov=lib
 

From 2bbbc02ef4a24545bd314bffc7499b1324c7bb88 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sat, 7 Feb 2026 12:53:02 +0000
Subject: [PATCH 06/15] Try delaying re-run [skip doc] [skip appveyor]

---
 lib/matplotlib/tests/test_backend_ps.py           | 2 +-
 lib/matplotlib/tests/test_backend_tk.py           | 4 ++--
 lib/matplotlib/tests/test_backends_interactive.py | 6 +++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
index 9859a286e5fd..9d23550fe25e 100644
--- a/lib/matplotlib/tests/test_backend_ps.py
+++ b/lib/matplotlib/tests/test_backend_ps.py
@@ -19,7 +19,7 @@
 
 
 # This tests tends to hit a TeX cache lock on AppVeyor.
-@pytest.mark.flaky(reruns=3)
+@pytest.mark.flaky(reruns=3, reruns_delay=10)
 @pytest.mark.parametrize('papersize', ['letter', 'figure'])
 @pytest.mark.parametrize('orientation', ['portrait', 'landscape'])
 @pytest.mark.parametrize('format, use_log, rcParams', [
diff --git a/lib/matplotlib/tests/test_backend_tk.py b/lib/matplotlib/tests/test_backend_tk.py
index 1f96ad1308cb..2aee605374d0 100644
--- a/lib/matplotlib/tests/test_backend_tk.py
+++ b/lib/matplotlib/tests/test_backend_tk.py
@@ -129,7 +129,7 @@ def legitimate_quit():
 @pytest.mark.skipif(platform.python_implementation() != 'CPython',
                     reason='PyPy does not support Tkinter threading: '
                            'https://foss.heptapod.net/pypy/pypy/-/issues/1929')
-@pytest.mark.flaky(reruns=3)
+@pytest.mark.flaky(reruns=3, reruns_delay=10)
 @_isolated_tk_test(success_count=1)
 def test_figuremanager_cleans_own_mainloop():
     import tkinter
@@ -156,7 +156,7 @@ def target():
     thread.join()
 
 
-@pytest.mark.flaky(reruns=3)
+@pytest.mark.flaky(reruns=3, reruns_delay=10)
 @_isolated_tk_test(success_count=0)
 def test_never_update():
     import tkinter
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
index 188983816372..79e51966e440 100644
--- a/lib/matplotlib/tests/test_backends_interactive.py
+++ b/lib/matplotlib/tests/test_backends_interactive.py
@@ -240,7 +240,7 @@ def check_alt_backend(alt_backend):
 
 @pytest.mark.parametrize("env", _get_testable_interactive_backends())
 @pytest.mark.parametrize("toolbar", ["toolbar2", "toolmanager"])
-@pytest.mark.flaky(reruns=_retry_count)
+@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10)
 def test_interactive_backend(env, toolbar):
     if env["MPLBACKEND"] == "macosx":
         if toolbar == "toolmanager":
@@ -335,7 +335,7 @@ def _test_thread_impl():
 
 
 @pytest.mark.parametrize("env", _thread_safe_backends)
-@pytest.mark.flaky(reruns=_retry_count)
+@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10)
 def test_interactive_thread_safety(env):
     proc = _run_helper(_test_thread_impl, timeout=_test_timeout, extra_env=env)
     assert proc.stdout.count("CloseEvent") == 1
@@ -623,7 +623,7 @@ def _test_number_of_draws_script():
 
 @pytest.mark.parametrize("env", _blit_backends)
 # subprocesses can struggle to get the display, so rerun a few times
-@pytest.mark.flaky(reruns=_retry_count)
+@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10)
 def test_blitting_events(env):
     proc = _run_helper(
         _test_number_of_draws_script, timeout=_test_timeout, extra_env=env)

From 2f03bf6f125873b2b2d82426fd891e1280ea7658 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sat, 7 Feb 2026 20:05:34 +0000
Subject: [PATCH 07/15] add __del__ method to classes that use Popen

---
 lib/matplotlib/animation.py  | 12 ++++++++++++
 lib/matplotlib/animation.pyi |  1 +
 2 files changed, 13 insertions(+)

diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
index be69dce4e927..064415b6a028 100644
--- a/lib/matplotlib/animation.py
+++ b/lib/matplotlib/animation.py
@@ -290,6 +290,7 @@ def __init__(self, fps=5, codec=None, bitrate=None, extra_args=None,
                          bitrate=bitrate)
         self.frame_format = self.supported_formats[0]
         self.extra_args = extra_args
+        self._proc = None
 
     def _adjust_frame_size(self):
         if self.codec == 'h264':
@@ -371,6 +372,16 @@ def isAvailable(cls):
         """Return whether a MovieWriter subclass is actually available."""
         return shutil.which(cls.bin_path()) is not None
 
+    def __del__(self):
+        if self._proc:
+            self._proc.kill()
+            self._proc.wait()
+            for stream in filter(None, [self._proc.stdin,
+                                        self._proc.stdout,
+                                        self._proc.stderr]):
+                stream.close()
+            self._proc = None
+
 
 class FileMovieWriter(MovieWriter):
     """
@@ -421,6 +432,7 @@ def setup(self, fig, outfile, dpi=None, frame_prefix=None):
         self.fname_format_str = '%s%%07d.%s'
 
     def __del__(self):
+        super().__del__()
         if hasattr(self, '_tmpdir') and self._tmpdir:
             self._tmpdir.cleanup()
 
diff --git a/lib/matplotlib/animation.pyi b/lib/matplotlib/animation.pyi
index e90a0103aefd..0ef14607c6d8 100644
--- a/lib/matplotlib/animation.pyi
+++ b/lib/matplotlib/animation.pyi
@@ -72,6 +72,7 @@ class MovieWriter(AbstractMovieWriter):
     def bin_path(cls) -> str: ...
     @classmethod
     def isAvailable(cls) -> bool: ...
+    def __del__(self) -> None: ...
 
 class FileMovieWriter(MovieWriter):
     fig: Figure

From 3562731fe35e113edef3ec6cc6fa38fd85dd64bd Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sat, 7 Feb 2026 22:24:18 +0000
Subject: [PATCH 08/15] try garbage collecting after every test [skip doc]
 [skip appveyor]

---
 lib/matplotlib/testing/conftest.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/matplotlib/testing/conftest.py b/lib/matplotlib/testing/conftest.py
index 6f87d9826cc3..91a81f44172e 100644
--- a/lib/matplotlib/testing/conftest.py
+++ b/lib/matplotlib/testing/conftest.py
@@ -1,4 +1,6 @@
 import os
+import gc
+import pytest
 import sys
 
 import pytest
@@ -81,6 +83,7 @@ def mpl_test_settings(request):
             if backend is not None:
                 plt.close("all")
                 matplotlib.use(prev_backend)
+            gc.collect()
 
 
 @pytest.fixture

From df6a37c8b7076ca2f3a62b1564e2d11f86a516a3 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sun, 8 Feb 2026 12:27:33 +0000
Subject: [PATCH 09/15] eliminate _LuatexKpsewhich from enquiries [skip doc]
 [skip appveyor]

---
 lib/matplotlib/dviread.py | 33 ++-------------------------------
 1 file changed, 2 insertions(+), 31 deletions(-)

diff --git a/lib/matplotlib/dviread.py b/lib/matplotlib/dviread.py
index f07157a63524..1c53214cd25c 100644
--- a/lib/matplotlib/dviread.py
+++ b/lib/matplotlib/dviread.py
@@ -23,10 +23,9 @@
 import os
 import re
 import struct
-import subprocess
 import sys
 from collections import namedtuple
-from functools import cache, cached_property, lru_cache, partial, wraps
+from functools import cached_property, lru_cache, partial, wraps
 from pathlib import Path
 
 import fontTools.agl
@@ -1244,31 +1243,6 @@ def _parse_enc(path):
         raise ValueError(f"Failed to parse {path} as Postscript encoding")
 
 
-class _LuatexKpsewhich:
-    @cache  # A singleton.
-    def __new__(cls):
-        self = object.__new__(cls)
-        self._proc = self._new_proc()
-        return self
-
-    def _new_proc(self):
-        return subprocess.Popen(
-            ["luatex", "--luaonly", str(cbook._get_data_path("kpsewhich.lua"))],
-            # mktexpk logs to stderr; suppress that.
-            stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL,
-            # Store generated pk fonts in our own cache.
-            env={"MT_VARTEXFONTS": str(Path(mpl.get_cachedir(), "vartexfonts")),
-                 **os.environ})
-
-    def search(self, filename):
-        if self._proc.poll() is not None:  # Dead, restart it.
-            self._proc = self._new_proc()
-        self._proc.stdin.write(os.fsencode(filename) + b"\n")
-        self._proc.stdin.flush()
-        out = self._proc.stdout.readline().rstrip()
-        return None if out == b"nil" else os.fsdecode(out)
-
-
 @lru_cache
 def find_tex_file(filename):
     """
@@ -1295,10 +1269,7 @@ def find_tex_file(filename):
     if isinstance(filename, bytes):
         filename = filename.decode('utf-8', errors='replace')
 
-    try:
-        lk = _LuatexKpsewhich()
-    except FileNotFoundError:
-        lk = None  # Fallback to directly calling kpsewhich, as below.
+    lk = None  # Fallback to directly calling kpsewhich, as below.
 
     if lk:
         path = lk.search(filename)

From e208058655733880b88046bd045ebf35fa22636f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jouni=20K=2E=20Sepp=C3=A4nen?= <jks@iki.fi>
Date: Sat, 5 Jul 2025 10:56:42 +0300
Subject: [PATCH 10/15] Only run tests that start subprocesses [skip doc] [skip
 appveyor]

---
 .github/workflows/tests.yml                       | 2 +-
 azure-pipelines.yml                               | 2 +-
 lib/matplotlib/testing/_markers.py                | 1 +
 lib/matplotlib/testing/conftest.py                | 1 +
 lib/matplotlib/tests/test_backend_inline.py       | 2 ++
 lib/matplotlib/tests/test_backend_nbagg.py        | 2 ++
 lib/matplotlib/tests/test_backend_webagg.py       | 2 ++
 lib/matplotlib/tests/test_backends_interactive.py | 4 ++++
 lib/matplotlib/tests/test_basic.py                | 2 ++
 lib/matplotlib/tests/test_determinism.py          | 6 +++++-
 lib/matplotlib/tests/test_font_manager.py         | 2 ++
 lib/matplotlib/tests/test_matplotlib.py           | 3 +++
 lib/matplotlib/tests/test_preprocess_data.py      | 3 +++
 lib/matplotlib/tests/test_pyplot.py               | 3 +++
 lib/matplotlib/tests/test_rcparams.py             | 4 ++++
 lib/matplotlib/tests/test_sphinxext.py            | 3 +++
 lib/matplotlib/tests/test_texmanager.py           | 2 ++
 17 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7e95dc3229dd..f575e9c536c7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -308,7 +308,7 @@ jobs:
           if [[ "${{ matrix.python-version }}" == '3.13t' ]]; then
             export PYTHON_GIL=0
           fi
-          pytest -vrfEsXR -n 2 \
+          pytest -vrfEsXR -n 2 -m starts_subprocess\
             --maxfail=50 --timeout=300 --durations=25 \
             --cov-report=xml --cov=lib --log-level=DEBUG --color=yes
 
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 5eb69258b671..0c57070953a6 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -120,7 +120,7 @@ stages:
 
               echo "##vso[task.setvariable variable=VS_COVERAGE_TOOL]$TOOL"
 
-              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 \
+              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 -m starts_subprocess \
                   --maxfail=50 --timeout=300 --durations=25 \
                   --junitxml=junit/test-results.xml --cov-report=xml --cov=lib
 
diff --git a/lib/matplotlib/testing/_markers.py b/lib/matplotlib/testing/_markers.py
index c7ef8687a8b3..c8795ef8ee90 100644
--- a/lib/matplotlib/testing/_markers.py
+++ b/lib/matplotlib/testing/_markers.py
@@ -47,3 +47,4 @@ def _checkdep_usetex() -> bool:
 needs_usetex = pytest.mark.skipif(
     not _checkdep_usetex(),
     reason="This test needs a TeX installation")
+starts_subprocess = pytest.mark.starts_subprocess
diff --git a/lib/matplotlib/testing/conftest.py b/lib/matplotlib/testing/conftest.py
index 91a81f44172e..84c8983a711c 100644
--- a/lib/matplotlib/testing/conftest.py
+++ b/lib/matplotlib/testing/conftest.py
@@ -20,6 +20,7 @@ def pytest_configure(config):
         ("markers", "backend: Set alternate Matplotlib backend temporarily."),
         ("markers", "baseline_images: Compare output against references."),
         ("markers", "pytz: Tests that require pytz to be installed."),
+        ("markers", "starts_subprocess: Tests that start subprocesses."),
         ("filterwarnings", "error"),
         ("filterwarnings",
          "ignore:.*The py23 module has been deprecated:DeprecationWarning"),
diff --git a/lib/matplotlib/tests/test_backend_inline.py b/lib/matplotlib/tests/test_backend_inline.py
index 997e1e7186b1..70e68ac2fb43 100644
--- a/lib/matplotlib/tests/test_backend_inline.py
+++ b/lib/matplotlib/tests/test_backend_inline.py
@@ -5,11 +5,13 @@
 import pytest
 
 from matplotlib.testing import subprocess_run_for_testing
+from matplotlib.testing._markers import starts_subprocess
 
 nbformat = pytest.importorskip('nbformat')
 pytest.importorskip('nbconvert')
 pytest.importorskip('ipykernel')
 pytest.importorskip('matplotlib_inline')
+pytestmark = starts_subprocess
 
 
 def test_ipynb():
diff --git a/lib/matplotlib/tests/test_backend_nbagg.py b/lib/matplotlib/tests/test_backend_nbagg.py
index ccf74df20aab..eaf711502c44 100644
--- a/lib/matplotlib/tests/test_backend_nbagg.py
+++ b/lib/matplotlib/tests/test_backend_nbagg.py
@@ -3,12 +3,14 @@
 from tempfile import TemporaryDirectory
 
 import pytest
+from matplotlib.testing._markers import starts_subprocess
 
 from matplotlib.testing import subprocess_run_for_testing
 
 nbformat = pytest.importorskip('nbformat')
 pytest.importorskip('nbconvert')
 pytest.importorskip('ipykernel')
+pytestmark = starts_subprocess
 
 # From https://blog.thedataincubator.com/2016/06/testing-jupyter-notebooks/
 
diff --git a/lib/matplotlib/tests/test_backend_webagg.py b/lib/matplotlib/tests/test_backend_webagg.py
index 1d6769494ef9..50100883747d 100644
--- a/lib/matplotlib/tests/test_backend_webagg.py
+++ b/lib/matplotlib/tests/test_backend_webagg.py
@@ -3,9 +3,11 @@
 import pytest
 
 import matplotlib.backends.backend_webagg_core
+from matplotlib.testing._markers import starts_subprocess
 from matplotlib.testing import subprocess_run_for_testing
 
 
+@starts_subprocess
 @pytest.mark.parametrize("backend", ["webagg", "nbagg"])
 def test_webagg_fallback(backend):
     pytest.importorskip("tornado")
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
index 79e51966e440..6344d62e2df8 100644
--- a/lib/matplotlib/tests/test_backends_interactive.py
+++ b/lib/matplotlib/tests/test_backends_interactive.py
@@ -20,6 +20,10 @@
 from matplotlib import _c_internal_utils
 from matplotlib.backend_tools import ToolToggleBase
 from matplotlib.testing import subprocess_run_helper as _run_helper, is_ci_environment
+from matplotlib.testing._markers import starts_subprocess
+
+
+pytestmark = starts_subprocess
 
 
 class _WaitForStringPopen(subprocess.Popen):
diff --git a/lib/matplotlib/tests/test_basic.py b/lib/matplotlib/tests/test_basic.py
index f6aa1e458555..976fba23c0ef 100644
--- a/lib/matplotlib/tests/test_basic.py
+++ b/lib/matplotlib/tests/test_basic.py
@@ -3,6 +3,7 @@
 import sys
 import textwrap
 
+from matplotlib.testing._markers import starts_subprocess
 from matplotlib.testing import subprocess_run_for_testing
 
 
@@ -28,6 +29,7 @@ def test_override_builtins():
     assert overridden <= ok_to_override
 
 
+@starts_subprocess
 def test_lazy_imports():
     source = textwrap.dedent("""
     import sys
diff --git a/lib/matplotlib/tests/test_determinism.py b/lib/matplotlib/tests/test_determinism.py
index c0e4adbef40b..9210cddc54a0 100644
--- a/lib/matplotlib/tests/test_determinism.py
+++ b/lib/matplotlib/tests/test_determinism.py
@@ -16,11 +16,15 @@
 from matplotlib.patches import Circle, PathPatch
 from matplotlib.path import Path
 from matplotlib.testing import subprocess_run_for_testing
-from matplotlib.testing._markers import needs_ghostscript, needs_usetex
+from matplotlib.testing._markers import (
+    needs_ghostscript, needs_usetex, starts_subprocess
+)
 import matplotlib.testing.compare
 from matplotlib.text import TextPath
 from matplotlib.transforms import IdentityTransform
 
+pytestmark = starts_subprocess
+
 
 def _save_figure(objects='mhip', fmt="pdf", usetex=False):
     mpl.use(fmt)
diff --git a/lib/matplotlib/tests/test_font_manager.py b/lib/matplotlib/tests/test_font_manager.py
index 1bca00e072a3..0d6f40d30801 100644
--- a/lib/matplotlib/tests/test_font_manager.py
+++ b/lib/matplotlib/tests/test_font_manager.py
@@ -19,6 +19,7 @@
     _get_fontconfig_fonts, _normalize_weight)
 from matplotlib import cbook, ft2font, pyplot as plt, rc_context, figure as mfigure
 from matplotlib.testing import subprocess_run_helper, subprocess_run_for_testing
+from matplotlib.testing._markers import starts_subprocess
 
 
 has_fclist = shutil.which('fc-list') is not None
@@ -289,6 +290,7 @@ def test_fontcache_thread_safe():
     subprocess_run_helper(_test_threading, timeout=10)
 
 
+@starts_subprocess
 def test_lockfilefailure(tmp_path):
     # The logic here:
     # 1. get a temp directory from pytest
diff --git a/lib/matplotlib/tests/test_matplotlib.py b/lib/matplotlib/tests/test_matplotlib.py
index d0a3f8c617e1..911ccf65d20e 100644
--- a/lib/matplotlib/tests/test_matplotlib.py
+++ b/lib/matplotlib/tests/test_matplotlib.py
@@ -7,6 +7,7 @@
 
 import matplotlib
 from matplotlib.testing import subprocess_run_for_testing
+from matplotlib.testing._markers import starts_subprocess
 
 
 @pytest.mark.parametrize('version_str, version_tuple', [
@@ -19,6 +20,7 @@ def test_parse_to_version_info(version_str, version_tuple):
     assert matplotlib._parse_to_version_info(version_str) == version_tuple
 
 
+@starts_subprocess
 @pytest.mark.skipif(sys.platform == "win32",
                     reason="chmod() doesn't work as is on Windows")
 @pytest.mark.skipif(sys.platform != "win32" and os.geteuid() == 0,
@@ -37,6 +39,7 @@ def test_tmpconfigdir_warning(tmp_path):
         os.chmod(tmp_path, mode)
 
 
+@starts_subprocess
 def test_importable_with_no_home(tmp_path):
     subprocess_run_for_testing(
         [sys.executable, "-c",
diff --git a/lib/matplotlib/tests/test_preprocess_data.py b/lib/matplotlib/tests/test_preprocess_data.py
index c983d78786e1..44db2733f10d 100644
--- a/lib/matplotlib/tests/test_preprocess_data.py
+++ b/lib/matplotlib/tests/test_preprocess_data.py
@@ -8,6 +8,8 @@
 from matplotlib.axes import Axes
 from matplotlib.testing import subprocess_run_for_testing
 from matplotlib.testing.decorators import check_figures_equal
+from matplotlib.testing._markers import starts_subprocess
+
 
 # Notes on testing the plotting functions itself
 # *   the individual decorated plotting functions are tested in 'test_axes.py'
@@ -245,6 +247,7 @@ def funcy(ax, x, y, z, t=None):
                          funcy.__doc__)
 
 
+@starts_subprocess
 def test_data_parameter_replacement():
     """
     Test that the docstring contains the correct *data* parameter stub
diff --git a/lib/matplotlib/tests/test_pyplot.py b/lib/matplotlib/tests/test_pyplot.py
index 1cca7332aa0c..7d3921dbbef7 100644
--- a/lib/matplotlib/tests/test_pyplot.py
+++ b/lib/matplotlib/tests/test_pyplot.py
@@ -11,7 +11,10 @@
 from matplotlib.testing import subprocess_run_for_testing
 from matplotlib import pyplot as plt
 
+from matplotlib.testing._markers import starts_subprocess
 
+
+@starts_subprocess
 def test_pyplot_up_to_date(tmp_path):
     pytest.importorskip("black", minversion="24.1")
 
diff --git a/lib/matplotlib/tests/test_rcparams.py b/lib/matplotlib/tests/test_rcparams.py
index 525a9ff60d1a..61ff9ced44a6 100644
--- a/lib/matplotlib/tests/test_rcparams.py
+++ b/lib/matplotlib/tests/test_rcparams.py
@@ -32,6 +32,7 @@
     _validate_linestyle,
     _listify_validator)
 from matplotlib.testing import subprocess_run_for_testing
+from matplotlib.testing._markers import starts_subprocess
 
 
 def test_rcparams(tmp_path):
@@ -529,6 +530,7 @@ def test_rcparams_reset_after_fail():
         assert mpl.rcParams['text.usetex'] is False
 
 
+@starts_subprocess
 @pytest.mark.skipif(sys.platform != "linux", reason="Linux only")
 def test_backend_fallback_headless_invalid_backend(tmp_path):
     env = {**os.environ,
@@ -546,6 +548,7 @@ def test_backend_fallback_headless_invalid_backend(tmp_path):
             env=env, check=True, stderr=subprocess.DEVNULL)
 
 
+@starts_subprocess
 @pytest.mark.skipif(sys.platform != "linux", reason="Linux only")
 def test_backend_fallback_headless_auto_backend(tmp_path):
     # specify a headless mpl environment, but request a graphical (tk) backend
@@ -568,6 +571,7 @@ def test_backend_fallback_headless_auto_backend(tmp_path):
     assert backend.strip().lower() == "agg"
 
 
+@starts_subprocess
 @pytest.mark.skipif(
     sys.platform == "linux" and not _c_internal_utils.xdisplay_is_valid(),
     reason="headless")
diff --git a/lib/matplotlib/tests/test_sphinxext.py b/lib/matplotlib/tests/test_sphinxext.py
index c6f4e13c74c2..91d436c52e42 100644
--- a/lib/matplotlib/tests/test_sphinxext.py
+++ b/lib/matplotlib/tests/test_sphinxext.py
@@ -7,6 +7,8 @@
 import sys
 
 from matplotlib.testing import subprocess_run_for_testing
+from matplotlib.testing._markers import starts_subprocess
+
 import pytest
 
 
@@ -16,6 +18,7 @@
 tinypages = Path(__file__).parent / 'data/tinypages'
 
 
+@starts_subprocess
 def build_sphinx_html(source_dir, doctree_dir, html_dir, extra_args=None):
     # Build the pages with warnings turned into errors
     extra_args = [] if extra_args is None else extra_args
diff --git a/lib/matplotlib/tests/test_texmanager.py b/lib/matplotlib/tests/test_texmanager.py
index 7e7b5632c7ac..4f957247bdad 100644
--- a/lib/matplotlib/tests/test_texmanager.py
+++ b/lib/matplotlib/tests/test_texmanager.py
@@ -9,6 +9,7 @@
 from matplotlib.testing import subprocess_run_for_testing
 from matplotlib.testing._markers import needs_usetex
 from matplotlib.texmanager import TexManager
+from matplotlib.testing._markers import starts_subprocess
 
 
 def test_fontconfig_preamble():
@@ -63,6 +64,7 @@ def test_unicode_characters():
         fig.canvas.draw()
 
 
+@starts_subprocess
 @needs_usetex
 def test_openin_any_paranoid():
     completed = subprocess_run_for_testing(

From 78535fdce98e554d94716109b7e77e7f76deb752 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sun, 8 Feb 2026 18:38:53 +0000
Subject: [PATCH 11/15] Revert "add __del__ method to classes that use Popen"

This reverts commit 62be2154a5ce0841f727dad6572e5dce71e4b4b2.
---
 lib/matplotlib/animation.py  | 12 ------------
 lib/matplotlib/animation.pyi |  1 -
 2 files changed, 13 deletions(-)

diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
index 064415b6a028..be69dce4e927 100644
--- a/lib/matplotlib/animation.py
+++ b/lib/matplotlib/animation.py
@@ -290,7 +290,6 @@ def __init__(self, fps=5, codec=None, bitrate=None, extra_args=None,
                          bitrate=bitrate)
         self.frame_format = self.supported_formats[0]
         self.extra_args = extra_args
-        self._proc = None
 
     def _adjust_frame_size(self):
         if self.codec == 'h264':
@@ -372,16 +371,6 @@ def isAvailable(cls):
         """Return whether a MovieWriter subclass is actually available."""
         return shutil.which(cls.bin_path()) is not None
 
-    def __del__(self):
-        if self._proc:
-            self._proc.kill()
-            self._proc.wait()
-            for stream in filter(None, [self._proc.stdin,
-                                        self._proc.stdout,
-                                        self._proc.stderr]):
-                stream.close()
-            self._proc = None
-
 
 class FileMovieWriter(MovieWriter):
     """
@@ -432,7 +421,6 @@ def setup(self, fig, outfile, dpi=None, frame_prefix=None):
         self.fname_format_str = '%s%%07d.%s'
 
     def __del__(self):
-        super().__del__()
         if hasattr(self, '_tmpdir') and self._tmpdir:
             self._tmpdir.cleanup()
 
diff --git a/lib/matplotlib/animation.pyi b/lib/matplotlib/animation.pyi
index 0ef14607c6d8..e90a0103aefd 100644
--- a/lib/matplotlib/animation.pyi
+++ b/lib/matplotlib/animation.pyi
@@ -72,7 +72,6 @@ class MovieWriter(AbstractMovieWriter):
     def bin_path(cls) -> str: ...
     @classmethod
     def isAvailable(cls) -> bool: ...
-    def __del__(self) -> None: ...
 
 class FileMovieWriter(MovieWriter):
     fig: Figure

From fcee466927c6bef45e220081bbc3629f91b65048 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sun, 8 Feb 2026 18:40:31 +0000
Subject: [PATCH 12/15] skip sigint tests [skip doc] [skip appveyor]

---
 lib/matplotlib/tests/test_backends_interactive.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
index 6344d62e2df8..41edb3f63b03 100644
--- a/lib/matplotlib/tests/test_backends_interactive.py
+++ b/lib/matplotlib/tests/test_backends_interactive.py
@@ -729,6 +729,7 @@ def interrupter():
         print('SUCCESS', flush=True)
 
 
+@pytest.mark.skip(reason='eliminate test from enquiries')
 @pytest.mark.parametrize("env", _get_testable_interactive_backends())
 @pytest.mark.parametrize("target, kwargs", [
     ('show', {'block': True}),
@@ -777,6 +778,7 @@ def custom_signal_handler(signum, frame):
         print('SUCCESS', flush=True)
 
 
+@pytest.mark.skip(reason='eliminate test from enquiries')
 @pytest.mark.skipif(sys.platform == 'win32',
                     reason='No other signal available to send on Windows')
 @pytest.mark.parametrize("env", _get_testable_interactive_backends())

From 1af2a9c8f08c818398ed4e484aacf5886a2054ae Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sun, 8 Feb 2026 21:03:13 +0000
Subject: [PATCH 13/15] only re-run on timeouts [skip doc] [skip appveyor]

---
 lib/matplotlib/tests/test_backend_ps.py           | 2 +-
 lib/matplotlib/tests/test_backend_tk.py           | 4 ++--
 lib/matplotlib/tests/test_backends_interactive.py | 9 ++++++---
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
index 9d23550fe25e..1efbd4e479f8 100644
--- a/lib/matplotlib/tests/test_backend_ps.py
+++ b/lib/matplotlib/tests/test_backend_ps.py
@@ -19,7 +19,7 @@
 
 
 # This tests tends to hit a TeX cache lock on AppVeyor.
-@pytest.mark.flaky(reruns=3, reruns_delay=10)
+@pytest.mark.flaky(reruns=3, reruns_delay=10, only_rerun=["subprocess.TimeoutExpired"])
 @pytest.mark.parametrize('papersize', ['letter', 'figure'])
 @pytest.mark.parametrize('orientation', ['portrait', 'landscape'])
 @pytest.mark.parametrize('format, use_log, rcParams', [
diff --git a/lib/matplotlib/tests/test_backend_tk.py b/lib/matplotlib/tests/test_backend_tk.py
index 2aee605374d0..65b78253fca2 100644
--- a/lib/matplotlib/tests/test_backend_tk.py
+++ b/lib/matplotlib/tests/test_backend_tk.py
@@ -129,7 +129,7 @@ def legitimate_quit():
 @pytest.mark.skipif(platform.python_implementation() != 'CPython',
                     reason='PyPy does not support Tkinter threading: '
                            'https://foss.heptapod.net/pypy/pypy/-/issues/1929')
-@pytest.mark.flaky(reruns=3, reruns_delay=10)
+@pytest.mark.flaky(reruns=3, reruns_delay=10, only_rerun=["subprocess.TimeoutExpired"])
 @_isolated_tk_test(success_count=1)
 def test_figuremanager_cleans_own_mainloop():
     import tkinter
@@ -156,7 +156,7 @@ def target():
     thread.join()
 
 
-@pytest.mark.flaky(reruns=3, reruns_delay=10)
+@pytest.mark.flaky(reruns=3, reruns_delay=10, only_rerun=["subprocess.TimeoutExpired"])
 @_isolated_tk_test(success_count=0)
 def test_never_update():
     import tkinter
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
index 41edb3f63b03..ff704e5fd2bb 100644
--- a/lib/matplotlib/tests/test_backends_interactive.py
+++ b/lib/matplotlib/tests/test_backends_interactive.py
@@ -244,7 +244,8 @@ def check_alt_backend(alt_backend):
 
 @pytest.mark.parametrize("env", _get_testable_interactive_backends())
 @pytest.mark.parametrize("toolbar", ["toolbar2", "toolmanager"])
-@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10)
+@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10,
+                   only_rerun=["subprocess.TimeoutExpired"])
 def test_interactive_backend(env, toolbar):
     if env["MPLBACKEND"] == "macosx":
         if toolbar == "toolmanager":
@@ -339,7 +340,8 @@ def _test_thread_impl():
 
 
 @pytest.mark.parametrize("env", _thread_safe_backends)
-@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10)
+@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10,
+                   only_rerun=["subprocess.TimeoutExpired"])
 def test_interactive_thread_safety(env):
     proc = _run_helper(_test_thread_impl, timeout=_test_timeout, extra_env=env)
     assert proc.stdout.count("CloseEvent") == 1
@@ -627,7 +629,8 @@ def _test_number_of_draws_script():
 
 @pytest.mark.parametrize("env", _blit_backends)
 # subprocesses can struggle to get the display, so rerun a few times
-@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10)
+@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10,
+                   only_rerun=["subprocess.TimeoutExpired"])
 def test_blitting_events(env):
     proc = _run_helper(
         _test_number_of_draws_script, timeout=_test_timeout, extra_env=env)

From 7801a23de015ab1ee613c115ecb413845a969607 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sun, 8 Feb 2026 22:15:45 +0000
Subject: [PATCH 14/15] Run all tests on Azure; remove flaky markers  [skip
 doc] [skip appveyor]

---
 azure-pipelines.yml                               | 2 +-
 lib/matplotlib/tests/test_backend_ps.py           | 2 --
 lib/matplotlib/tests/test_backend_tk.py           | 2 --
 lib/matplotlib/tests/test_backends_interactive.py | 7 -------
 4 files changed, 1 insertion(+), 12 deletions(-)

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 0c57070953a6..5eb69258b671 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -120,7 +120,7 @@ stages:
 
               echo "##vso[task.setvariable variable=VS_COVERAGE_TOOL]$TOOL"
 
-              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 -m starts_subprocess \
+              PYTHONFAULTHANDLER=1 pytest -vrfEsXR -n 2 \
                   --maxfail=50 --timeout=300 --durations=25 \
                   --junitxml=junit/test-results.xml --cov-report=xml --cov=lib
 
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
index 1efbd4e479f8..dd811ae3f8f5 100644
--- a/lib/matplotlib/tests/test_backend_ps.py
+++ b/lib/matplotlib/tests/test_backend_ps.py
@@ -18,8 +18,6 @@
 import matplotlib.pyplot as plt
 
 
-# This tests tends to hit a TeX cache lock on AppVeyor.
-@pytest.mark.flaky(reruns=3, reruns_delay=10, only_rerun=["subprocess.TimeoutExpired"])
 @pytest.mark.parametrize('papersize', ['letter', 'figure'])
 @pytest.mark.parametrize('orientation', ['portrait', 'landscape'])
 @pytest.mark.parametrize('format, use_log, rcParams', [
diff --git a/lib/matplotlib/tests/test_backend_tk.py b/lib/matplotlib/tests/test_backend_tk.py
index 65b78253fca2..54d90cd09644 100644
--- a/lib/matplotlib/tests/test_backend_tk.py
+++ b/lib/matplotlib/tests/test_backend_tk.py
@@ -129,7 +129,6 @@ def legitimate_quit():
 @pytest.mark.skipif(platform.python_implementation() != 'CPython',
                     reason='PyPy does not support Tkinter threading: '
                            'https://foss.heptapod.net/pypy/pypy/-/issues/1929')
-@pytest.mark.flaky(reruns=3, reruns_delay=10, only_rerun=["subprocess.TimeoutExpired"])
 @_isolated_tk_test(success_count=1)
 def test_figuremanager_cleans_own_mainloop():
     import tkinter
@@ -156,7 +155,6 @@ def target():
     thread.join()
 
 
-@pytest.mark.flaky(reruns=3, reruns_delay=10, only_rerun=["subprocess.TimeoutExpired"])
 @_isolated_tk_test(success_count=0)
 def test_never_update():
     import tkinter
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
index ff704e5fd2bb..df94de730204 100644
--- a/lib/matplotlib/tests/test_backends_interactive.py
+++ b/lib/matplotlib/tests/test_backends_interactive.py
@@ -244,8 +244,6 @@ def check_alt_backend(alt_backend):
 
 @pytest.mark.parametrize("env", _get_testable_interactive_backends())
 @pytest.mark.parametrize("toolbar", ["toolbar2", "toolmanager"])
-@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10,
-                   only_rerun=["subprocess.TimeoutExpired"])
 def test_interactive_backend(env, toolbar):
     if env["MPLBACKEND"] == "macosx":
         if toolbar == "toolmanager":
@@ -340,8 +338,6 @@ def _test_thread_impl():
 
 
 @pytest.mark.parametrize("env", _thread_safe_backends)
-@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10,
-                   only_rerun=["subprocess.TimeoutExpired"])
 def test_interactive_thread_safety(env):
     proc = _run_helper(_test_thread_impl, timeout=_test_timeout, extra_env=env)
     assert proc.stdout.count("CloseEvent") == 1
@@ -628,9 +624,6 @@ def _test_number_of_draws_script():
 
 
 @pytest.mark.parametrize("env", _blit_backends)
-# subprocesses can struggle to get the display, so rerun a few times
-@pytest.mark.flaky(reruns=_retry_count, reruns_delay=10,
-                   only_rerun=["subprocess.TimeoutExpired"])
 def test_blitting_events(env):
     proc = _run_helper(
         _test_number_of_draws_script, timeout=_test_timeout, extra_env=env)

From 8ea617e1bc77a2b7f6eee933d090c31d73441005 Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Sat, 28 Feb 2026 16:32:05 +0000
Subject: [PATCH 15/15] post rebase linting fix [skip doc] [skip appveyor]

---
 lib/matplotlib/testing/conftest.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/matplotlib/testing/conftest.py b/lib/matplotlib/testing/conftest.py
index 84c8983a711c..1bf57894151f 100644
--- a/lib/matplotlib/testing/conftest.py
+++ b/lib/matplotlib/testing/conftest.py
@@ -1,6 +1,5 @@
 import os
 import gc
-import pytest
 import sys
 
 import pytest