diff --git a/Lib/test/test_tools/test_msgfmt.py b/Lib/test/test_tools/test_msgfmt.py
index 55a10888c21f70..dafac0562f472d 100644
--- a/Lib/test/test_tools/test_msgfmt.py
+++ b/Lib/test/test_tools/test_msgfmt.py
@@ -1,6 +1,7 @@
"""Tests for the Tools/i18n/msgfmt.py tool."""
import json
+import struct
import sys
import unittest
from gettext import GNUTranslations
@@ -40,6 +41,28 @@ def test_compilation(self):
self.assertDictEqual(actual._catalog, expected._catalog)
+ def test_binary_header(self):
+ with open(data_dir / "general.mo", "rb") as f:
+ mo_data = f.read()
+
+ (
+ magic,
+ version,
+ num_strings,
+ orig_table_offset,
+ trans_table_offset,
+ hash_table_size,
+ hash_table_offset,
+ ) = struct.unpack("=Iiiiiii", mo_data[:28])
+
+ self.assertEqual(magic, 0x950412de)
+ self.assertEqual(version, 0)
+ self.assertEqual(num_strings, 9)
+ self.assertEqual(orig_table_offset, 28)
+ self.assertEqual(trans_table_offset, 100)
+ self.assertEqual(hash_table_size, 0)
+ self.assertEqual(hash_table_offset, 0)
+
def test_translations(self):
with open(data_dir / 'general.mo', 'rb') as f:
t = GNUTranslations(f)
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