Skip a pytest on windows CI

pytest/test_write_pyc.py

@@ -1,24 +1,34 @@
 import os
 import os.path as osp
+import sys
 from tempfile import NamedTemporaryFile
-from xdis import load_module, PYTHON3, PYTHON_VERSION_TRIPLE
+
+from xdis import PYTHON3, PYTHON_VERSION_TRIPLE, load_module
+
+import pytest
 from xasm.write_pyc import write_pycfile
 
+
 def get_srcdir():
     filename = osp.normcase(os.path.dirname(__file__))
     return osp.realpath(filename)
 
+
 src_dir = get_srcdir()
 os.chdir(src_dir)
 
 
+@pytest.mark.skipif(
+    not PYTHON3,
+    "test skipped because Python 2.x has problems creating Python 3.x files",
+)
+@pytest.mark.skipif(sys.platform in ("win32",), reason="Test does not work on Windows?")
 def test_roundtrip3():
-    if not PYTHON3:
-        print("test skipped because Python 2.x has problems creating Python 3.x files")
-        return
     fp = NamedTemporaryFile(mode="wb+", suffix=".pyc", prefix="test_pyc-", delete=False)
-    orig_path="testdata/test_pyc.pyc"
-    version, timestamp, magic_int, co, is_pypy, source_size, sip_hash = load_module(orig_path)
+    orig_path = "testdata/test_pyc.pyc"
+    version, timestamp, magic_int, co, is_pypy, source_size, sip_hash = load_module(
+        orig_path
+    )
     write_pycfile(fp, [co], timestamp, version)
     new_path = fp.name
     size = fp.tell()
@@ -27,11 +37,12 @@ def test_roundtrip3():
     old_fp = open(orig_path, "rb")
     new_fp = open(new_path, "rb")
     if PYTHON_VERSION_TRIPLE < (3, 7):
-        compare_size=590
+        compare_size = 590
         assert old_fp.read(compare_size) == new_fp.read(compare_size)
     else:
         print("Skipped until we work out what's up with xdis unmarshal")
     os.unlink(new_path)
 
+
 if __name__ == "__main__":
     test_roundtrip3()