Drop direct test dependency on iso8601

The current usages can be replaced by the built-in datetime module,
or the utility method from oslo.utils.

Change-Id: I5e13fd132ece859e7b02a76ce1a0435df6e0359e

manila/tests/api/test_extensions.py

@@ -17,9 +17,9 @@
 from unittest import mock
 
 import ddt
-import iso8601
 from oslo_config import cfg
 from oslo_serialization import jsonutils
+from oslo_utils import timeutils
 import webob
 
 from manila.api import extensions
@@ -62,7 +62,7 @@ class ExtensionControllerTest(ExtensionTestCase):
 
         # Ensure all the timestamps are valid according to iso8601
         for ext in data['extensions']:
-            iso8601.parse_date(ext['updated'])
+            timeutils.parse_isotime(ext['updated'])
 
         # Make sure that at least Fox in Sox is correct.
         (fox_ext, ) = [

manila/tests/api/v2/stubs.py

@@ -11,7 +11,6 @@
 #    under the License.
 
 import datetime
-import iso8601
 
 from manila.message import message_field
 from manila.message import message_levels
@@ -31,11 +30,11 @@ def stub_message(id, **kwargs):
         'resource_type': message_field.Resource.SHARE,
         'resource_id': FAKE_UUID,
         'updated_at': datetime.datetime(1900, 1, 1, 1, 1, 1,
-                                        tzinfo=iso8601.UTC),
+                                        tzinfo=datetime.timezone.utc),
         'created_at': datetime.datetime(1900, 1, 1, 1, 1, 1,
-                                        tzinfo=iso8601.UTC),
+                                        tzinfo=datetime.timezone.utc),
         'expires_at': datetime.datetime(1900, 1, 1, 1, 1, 1,
-                                        tzinfo=iso8601.UTC),
+                                        tzinfo=datetime.timezone.utc),
         'detail_id': message_field.Detail.NO_VALID_HOST[0],
     }
 
@@ -58,9 +57,9 @@ def stub_lock(id, **kwargs):
         'lock_context': 'user',
         'lock_reason': 'for the tests',
         'updated_at': datetime.datetime(2023, 8, 10, 20, 4, 39,
-                                        tzinfo=iso8601.UTC),
+                                        tzinfo=datetime.timezone.utc),
         'created_at': datetime.datetime(2023, 1, 10, 15, 3, 1,
-                                        tzinfo=iso8601.UTC),
+                                        tzinfo=datetime.timezone.utc),
     }
 
     lock.update(kwargs)

manila/tests/api/v2/test_messages.py

@@ -13,7 +13,6 @@
 from unittest import mock
 
 import datetime
-import iso8601
 from oslo_config import cfg
 import webob
 
@@ -188,8 +187,8 @@ class MessageApiTest(test.TestCase):
     def test_index_with_created_since_and_created_before(self):
         msg = stubs.stub_message(
             fakes.get_fake_uuid(),
-            created_at=datetime.datetime(1900, 2, 1, 1, 1, 1,
+            created_at=datetime.datetime(
-                                         tzinfo=iso8601.UTC))
+                1900, 2, 1, 1, 1, 1, tzinfo=datetime.timezone.utc))
         self.mock_object(message_api.API, 'get_all', mock.Mock(
                          return_value=[msg]))
         req = fakes.HTTPRequest.blank(
@@ -203,8 +202,9 @@ class MessageApiTest(test.TestCase):
 
         ex2 = self._expected_message_from_controller(
             msg['id'],
-            created_at=datetime.datetime(1900, 2, 1, 1, 1, 1,
+            created_at=datetime.datetime(
-                                         tzinfo=iso8601.UTC))['message']
+                1900, 2, 1, 1, 1, 1,
+                tzinfo=datetime.timezone.utc))['message']
         self.assertEqual([ex2], res_dict['messages'])
 
     def test_index_with_invalid_time_format(self):

test-requirements.txt

@@ -3,7 +3,6 @@ hacking>=6.1.0,<6.2.0 # Apache-2.0
 coverage>=5.2.1 # Apache-2.0
 ddt>=1.4.1 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
-iso8601>=0.1.12 # MIT
 oslotest>=4.4.1 # Apache-2.0
 
 # Do not remove 'PyMySQL' and 'psycopg2-binary' dependencies. They are used