def test_fallback_to_different_backend():
        pytest.importorskip("IPython")
        # Runs the process that caused the GH issue 23770
        # making sure that this doesn't crash
        # since we're supposed to be switching to a different backend instead.
>       response = _run_helper(_fallback_check, timeout=_test_timeout)

lib\matplotlib\tests\test_backends_interactive.py:644: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
lib\matplotlib\testing\__init__.py:128: in subprocess_run_helper
    proc = subprocess_run_for_testing(
lib\matplotlib\testing\__init__.py:96: in subprocess_run_for_testing
    proc = subprocess.run(
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\subprocess.py:505: in run
    stdout, stderr = process.communicate(input, timeout=timeout)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\subprocess.py:1154: in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <Popen: returncode: 1 args: ['C:\\hostedtoolcache\\windows\\Python\\3.10.11\...>
input = None, endtime = 1702.812, orig_timeout = 20

    def _communicate(self, input, endtime, orig_timeout):
        # Start reader threads feeding into a list hanging off of this
        # object, unless they've already been started.
        if self.stdout and not hasattr(self, "_stdout_buff"):
            self._stdout_buff = []
            self.stdout_thread = \
                    threading.Thread(target=self._readerthread,
                                     args=(self.stdout, self._stdout_buff))
            self.stdout_thread.daemon = True
            self.stdout_thread.start()
        if self.stderr and not hasattr(self, "_stderr_buff"):
            self._stderr_buff = []
            self.stderr_thread = \
                    threading.Thread(target=self._readerthread,
                                     args=(self.stderr, self._stderr_buff))
            self.stderr_thread.daemon = True
            self.stderr_thread.start()
    
        if self.stdin:
            self._stdin_write(input)
    
        # Wait for the reader threads, or time out.  If we time out, the
        # threads remain reading and the fds left open in case the user
        # calls communicate again.
        if self.stdout is not None:
            self.stdout_thread.join(self._remaining_time(endtime))
            if self.stdout_thread.is_alive():
>               raise TimeoutExpired(self.args, orig_timeout)
E               subprocess.TimeoutExpired: Command '['C:\\hostedtoolcache\\windows\\Python\\3.10.11\\x64\\python.exe', '-c', "import importlib.util;_spec = importlib.util.spec_from_file_location('matplotlib.tests.test_backends_interactive', 'D:\\\\a\\\\1\\\\s\\\\lib\\\\matplotlib\\\\tests\\\\test_backends_interactive.py');_module = importlib.util.module_from_spec(_spec);_spec.loader.exec_module(_module);_module._fallback_check()"]' timed out after 20 seconds

C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\subprocess.py:1546: TimeoutExpired