1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/test/test_bz2.py b/Lib/test/test_bz2.py
index efed3a859b..7913beb87a 100644
--- a/Lib/test/test_bz2.py
+++ b/Lib/test/test_bz2.py
@@ -1,6 +1,7 @@
 from test import support
 from test.support import bigmemtest, _4G
 
+import array
 import unittest
 from io import BytesIO, DEFAULT_BUFFER_SIZE
 import os
@@ -620,6 +621,14 @@ class BZ2FileTest(BaseTest):
             with BZ2File(BytesIO(truncated[:i])) as f:
                 self.assertRaises(EOFError, f.read, 1)
 
+    def test_issue44439(self):
+        q = array.array('Q', [1, 2, 3, 4, 5])
+        LENGTH = len(q) * q.itemsize
+
+        with BZ2File(BytesIO(), 'w') as f:
+            self.assertEqual(f.write(q), LENGTH)
+            self.assertEqual(f.tell(), LENGTH)
+
 
 class BZ2CompressorTest(BaseTest):
     def testCompress(self):