sys.__stdout__.isatty() returns incorrect value for Windows 11

[jdgsmallwood]

Pytest is returning an incorrect value for sys.__stdout__.isatty() on Windows 11 vs Linux / previous versions of Windows.

To reproduce:

1. Create a file with the following code

import sys
import os 
def test_example():    
    assert not sys.__stdout__.isatty()
    assert not os.isatty(sys.__stdout__.fileno())

2. Run pytest from the terminal - tests will pass on Linux / Windows pre-11 and fail on Windows 11.

Output of pip list

Package    Version
---------- -------
colorama   0.4.6
iniconfig  2.0.0
packaging  24.0
pip        22.3.1
pluggy     1.5.0
pytest     8.2.1
setuptools 65.5.0

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using
• pytest and operating system versions
• minimal example if possible