Remove the nose dependency from Glacier unit tests.
Replace nose.tools.assert_equal() with the standard library
unittest.TestCase.assertEqual() method to allow running the tests
without nose.
--- ../tests/unit/glacier/test_writer.py	2026-10-18 00:57:48.150986215 +0300
+++ ../tests/unit/glacier/test_writer.py	2026-10-18 00:58:13.362248615 +0300
@@ -29,7 +29,6 @@
     Mock,
     sentinel,
 )
-from nose.tools import assert_equal
 
 from boto.glacier.layer1 import Layer1
 from boto.glacier.vault import Vault
@@ -80,7 +79,7 @@
                            data_len):
     vault.layer1.upload_part.assert_has_calls(
         upload_part_calls, any_order=True)
-    assert_equal(
+    unittest.TestCase().assertEqual(
         len(upload_part_calls), vault.layer1.upload_part.call_count)
 
     data_tree_hash = bytes_to_hex(tree_hash(data_tree_hashes))