bpo-43651: PEP 597: Fix EncodingWarning in some tests (GH-25190)

* Fix test_lzma
* Fix test_mailbox
* Fix test_mimetypes
* Fix test_posix

1 files changed, 7 insertions, 6 deletions

diff --git a/Lib/test/test_lzma.py b/Lib/test/test_lzma.py
index c2427f8..db20300 100644
--- a/Lib/test/test_lzma.py
+++ b/Lib/test/test_lzma.py
@@ -1250,14 +1250,14 @@ class OpenTestCase(unittest.TestCase):
     def test_text_modes(self):
         uncompressed = INPUT.decode("ascii")
         uncompressed_raw = uncompressed.replace("\n", os.linesep)
-        with lzma.open(BytesIO(COMPRESSED_XZ), "rt") as f:
+        with lzma.open(BytesIO(COMPRESSED_XZ), "rt", encoding="ascii") as f:
             self.assertEqual(f.read(), uncompressed)
         with BytesIO() as bio:
-            with lzma.open(bio, "wt") as f:
+            with lzma.open(bio, "wt", encoding="ascii") as f:
                 f.write(uncompressed)
             file_data = lzma.decompress(bio.getvalue()).decode("ascii")
             self.assertEqual(file_data, uncompressed_raw)
-            with lzma.open(bio, "at") as f:
+            with lzma.open(bio, "at", encoding="ascii") as f:
                 f.write(uncompressed)
             file_data = lzma.decompress(bio.getvalue()).decode("ascii")
             self.assertEqual(file_data, uncompressed_raw * 2)
@@ -1334,17 +1334,18 @@ class OpenTestCase(unittest.TestCase):
         # Test with explicit newline (universal newline mode disabled).
         text = INPUT.decode("ascii")
         with BytesIO() as bio:
-            with lzma.open(bio, "wt", newline="\n") as f:
+            with lzma.open(bio, "wt", encoding="ascii", newline="\n") as f:
                 f.write(text)
             bio.seek(0)
-            with lzma.open(bio, "rt", newline="\r") as f:
+            with lzma.open(bio, "rt", encoding="ascii", newline="\r") as f:
                 self.assertEqual(f.readlines(), [text])
 
     def test_x_mode(self):
         self.addCleanup(unlink, TESTFN)
         for mode in ("x", "xb", "xt"):
             unlink(TESTFN)
-            with lzma.open(TESTFN, mode):
+            encoding = "ascii" if "t" in mode else None
+            with lzma.open(TESTFN, mode, encoding=encoding):
                 pass
             with self.assertRaises(FileExistsError):
                 with lzma.open(TESTFN, mode):