diff --git a/test/conftest.py b/test/conftest.py
index 68ae77f..b1cf16f 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -459,6 +459,8 @@ def ds1_dset(tst_sys, cygwin_sys):
     dset.add_file(f'test alt/test alt##C.S.H.U')
     dset.add_file(f'test_cygwin_copy##{tst_sys}')
     dset.add_file(f'test_cygwin_copy##{cygwin_sys}')
+    dset.add_file(f'test_cygwin_copy##os.{tst_sys}')
+    dset.add_file(f'test_cygwin_copy##os.{cygwin_sys}')
     dset.add_file('u1', tracked=False)
     dset.add_file('d2/u2', tracked=False)
     dset.add_file('.ssh/p1', tracked=False, private=True)
diff --git a/test/test_cygwin_copy.py b/test/test_cygwin_copy.py
index 92141e3..47dbb61 100644
--- a/test/test_cygwin_copy.py
+++ b/test/test_cygwin_copy.py
@@ -37,7 +37,11 @@ def test_cygwin_copy(
     if setting is not None:
         os.system(' '.join(yadm_y('config', 'yadm.cygwin-copy', str(setting))))
 
-    expected_content = f'test_cygwin_copy##{tst_sys}'
+    if compatibility:
+        expected_content = f'test_cygwin_copy##{tst_sys}'
+    else:
+        expected_content = f'test_cygwin_copy##os.{tst_sys}'
+
     alt_path = paths.work.join('test_cygwin_copy')
     if pre_existing == 'symlink':
         alt_path.mklinkto(expected_content)
@@ -49,13 +53,14 @@ def test_cygwin_copy(
         uname = uname_path.join('uname')
         uname.write(f'#!/bin/sh\necho "{cygwin_sys}"\n')
         uname.chmod(0o777)
-        expected_content = f'test_cygwin_copy##{cygwin_sys}'
+        if compatibility:
+            expected_content = f'test_cygwin_copy##{cygwin_sys}'
+        else:
+            expected_content = f'test_cygwin_copy##os.{cygwin_sys}'
     env = os.environ.copy()
     env['PATH'] = ':'.join([str(uname_path), env['PATH']])
     if compatibility:
         env['YADM_COMPATIBILITY'] = '1'
-    else:
-        pytest.xfail('Alternates 2.0.0 has not been implemented.')
 
     run = runner(yadm_y('alt'), env=env)
     assert run.success