PY-79922 ensure there're no warnings

make sure shell completion initialization
logic throws no warnings

per `pytest` doc https://docs.pytest.org/en/latest/how-to/capture-warnings.html#additional-use-cases-of-warnings-in-tests


(cherry picked from commit 31f69636b78ee135082d6087788578c191e2e25f)

IJ-MR-158254

GitOrigin-RevId: 1f51e49050ddc7feb1e4ca73b34aab228079d3a9

python/helpers/pydev/pydev_tests/test_pydev_ipython_011.py

@@ -2,6 +2,7 @@ import os
 import sys
 import time
 import unittest
+import warnings
 
 import pytest
 
@@ -9,6 +10,8 @@ pytest.importorskip('IPython')
 
 from _pydev_bundle.pydev_stdin import StdIn
 from _pydev_bundle.pydev_localhost import get_localhost
+from _pydev_bundle.pydev_ipython_console_011 import PyDevTerminalInteractiveShell
+from _pydev_bundle.pydev_ipython_completer import init_shell_completer
 from _pydev_comm.pydev_rpc import make_rpc_client
 from _pydevd_bundle import pydevd_io
 from _pydevd_bundle.pydevd_constants import IS_PY2
@@ -27,6 +30,18 @@ def eq_(a, b):
         raise AssertionError('%s != %s' % (a, b))
 
 
+@pytest.fixture
+def assert_no_warnings():
+    with warnings.catch_warnings():
+        warnings.simplefilter('error')
+        yield
+
+
+def test_no_deprecations(assert_no_warnings):
+    shell = PyDevTerminalInteractiveShell()
+    init_shell_completer(shell)
+
+
 class TestBase(unittest.TestCase):
 
     def setUp(self):