prefer sys.platform over os.name when checking for windows OS

tests/languages/python_test.py

@@ -36,10 +36,10 @@ def test_read_pyvenv_cfg_non_utf8(tmpdir):
 
 def test_norm_version_expanduser():
     home = os.path.expanduser('~')
-    if os.name == 'nt':  # pragma: nt cover
+    if sys.platform == 'win32':  # pragma: win32 cover
         path = r'~\python343'
         expected_path = fr'{home}\python343'
-    else:  # pragma: nt no cover
+    else:  # pragma: win32 no cover
         path = '~/.pyenv/versions/3.4.3/bin/python'
         expected_path = f'{home}/.pyenv/versions/3.4.3/bin/python'
     result = python.norm_version(path)

tests/parse_shebang_test.py

@@ -94,7 +94,7 @@ def test_normexe_does_not_exist_sep():
     assert excinfo.value.args == ('Executable `./i-dont-exist-lol` not found',)
 
 
-@pytest.mark.xfail(os.name == 'nt', reason='posix only')
+@pytest.mark.xfail(sys.platform == 'win32', reason='posix only')
 def test_normexe_not_executable(tmpdir):  # pragma: win32 no cover
     tmpdir.join('exe').ensure()
     with tmpdir.as_cwd(), pytest.raises(OSError) as excinfo:

tests/repository_test.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import os.path
 import shutil
+import sys
 from typing import Any
 from unittest import mock
 
@@ -198,7 +199,7 @@ def test_intermixed_stdout_stderr(tempdir_factory, store):
     )
 
 
-@pytest.mark.xfail(os.name == 'nt', reason='ptys are posix-only')
+@pytest.mark.xfail(sys.platform == 'win32', reason='ptys are posix-only')
 def test_output_isatty(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'stdout_stderr_repo',

tests/xargs_test.py

@@ -187,7 +187,7 @@ def test_xargs_propagate_kwargs_to_cmd():
     assert b'Pre commit is awesome' in stdout
 
 
-@pytest.mark.xfail(os.name == 'nt', reason='posix only')
+@pytest.mark.xfail(sys.platform == 'win32', reason='posix only')
 def test_xargs_color_true_makes_tty():
     retcode, out = xargs.xargs(
         (sys.executable, '-c', 'import sys; print(sys.stdout.isatty())'),