bpo-43219: skip Solaris in the test as well (GH-27257)

Author: kulikjak

Lib/test/test_shutil.py

@@ -37,6 +37,7 @@
 TESTFN_SRC = TESTFN + "_SRC"
 TESTFN_DST = TESTFN + "_DST"
 MACOS = sys.platform.startswith("darwin")
+SOLARIS = sys.platform.startswith("sunos")
 AIX = sys.platform[:3] == 'aix'
 try:
     import grp
@@ -1249,7 +1250,7 @@ def test_copyfile_same_file(self):
         # Make sure file is not corrupted.
         self.assertEqual(read_file(src_file), 'foo')
 
-    @unittest.skipIf(MACOS or _winapi, 'On MACOS and Windows the errors are not confusing (though different)')
+    @unittest.skipIf(MACOS or SOLARIS or _winapi, 'On MACOS, Solaris and Windows the errors are not confusing (though different)')
     def test_copyfile_nonexistent_dir(self):
         # Issue 43219
         src_dir = self.mkdtemp()