Snap store endpoints test is flaky

[lengau]

Bug Description

tests/unit/test_endpoints.py::test_snap_store is flaky, as the expiry time can be off by a second due to the way it is generated.

To Reproduce

Put your machine under load, then run:

uv run pytest tests/unit/test_endpoints.py::test_snap_store

until you get it.

Or see: https://github.com/canonical/craft-store/actions/runs/12286865000/job/34287817294?pr=241

part yaml

n/a

Relevant log output

================================== FAILURES ===================================
  _______________________________ test_snap_store _______________________________
  
  expires = <function expires.<locals>.offset_iso_dt at 0x000002D4A62ED800>
  
      def test_snap_store(expires):
          snap_store = endpoints.SNAP_STORE
      
          assert snap_store.tokens == "/api/v2/tokens"
          assert snap_store.tokens_exchange == "/api/v2/tokens/exchange"
          assert snap_store.whoami == "/api/v2/tokens/whoami"
          assert snap_store.upload == "/unscanned-upload/"
  >       assert snap_store.get_token_request(
              permissions=["permission-foo", "permission-bar"],
              description="client description",
              ttl=1000,
          ) == {
              "permissions": ["permission-foo", "permission-bar"],
              "description": "client description",
              "expires": expires(1000),
          }
  E       AssertionError: assert {'description...mission-bar']} == {'description...mission-bar']}
  E         
  E         Omitting 2 identical items, use -vv to show
  E         Differing items:
  E         {'expires': '2024-12-12T00:00:23+00:00'} != {'expires': '2024-12-12T00:00:22+00:00'}
  E         
  E         Full diff:
  E           {
  E               'description': 'client description',
  E         -     'expires': '2024-12-12T00:00:22+00:00',
  E         ?                                   ^
  E         +     'expires': '2024-12-12T00:00:23+00:00',
  E         ?                                   ^
  E               'permissions': [
  E                   'permission-foo',
  E                   'permission-bar',
  E               ],
  E           }
  
  tests\unit\test_endpoints.py:119: AssertionError
  =========================== short test summary info ===========================
  FAILED tests/unit/test_endpoints.py::test_snap_store - AssertionError: assert {'description...mission-bar']} == {'description...mission-bar']}
    
    Omitting 2 identical items, use -vv to show
    Differing items:
    {'expires': '2024-12-12T00:00:23+00:00'} != {'expires': '2024-12-12T00:00:22+00:00'}
    
    Full diff:
      {
          'description': 'client description',
    -     'expires': '2024-12-12T00:00:22+00:00',
    ?                                   ^
    +     'expires': '2024-12-12T00:00:23+00:00',
    ?                                   ^
          'permissions': [
              'permission-foo',
              'permission-bar',
          ],
      }
  ================ 1 failed, 200 passed, 14 deselected in 4.78s =================

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3800.

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