Make tests deterministic with offline mocks

[LeMyst]

Add a pytest conftest fixture and helper fakes to mock MediaWiki/Wikibase network calls for offline testing (test/conftest.py). Update multiple tests to use these mocks and unittest.mock.patch:

• test_entity_item.py: add fake entity builders, fake _get/edit implementations, a fake FastRun container, and setUp/tearDown to patch network interactions; adjust write test and remove external HTTP dependency.
• test_wbi_backoff.py: patch requests.get to simulate HTTP responses and patch login to raise errors for deterministic backoff behavior.
• test_wbi_core.py: initialize shared common_item in setUpClass.
• test_wbi_helpers.py: provide a fake mediawiki_api_call helper and use monkeypatch in tests (connection, sparql, format2wbi, user agent, allow_anonymous) to avoid real network calls.
• test_wbi_login.py: add a FakeResponse and patch Session.post, Handshaker, and login methods to simulate various login failure modes deterministically.

Overall this change refactors tests to be network-independent and more reliable in CI/local runs.

[Copilot]

Pull request overview

This PR aims to make the test suite deterministic and runnable offline by introducing centralized pytest-level network fakes (via test/conftest.py) and refactoring several tests to patch network interactions instead of calling external services.

Changes:

• Added an autouse pytest fixture providing offline fakes for entity fetching, MediaWiki API helper calls, and SPARQL/FastRun interactions.
• Refactored multiple tests to use monkeypatch/unittest.mock.patch and local fake responses instead of real HTTP calls.
• Adjusted some test initialization logic to reduce import-time side effects.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/conftest.py	Adds autouse offline network mocks + fake entity/SPARQL payloads for deterministic tests.
test/test_entity_item.py	Adds per-test patching of entity _get, edit/write behavior, and FastRun container to remove external HTTP dependency.
test/test_wbi_backoff.py	Patches requests.get and login to simulate deterministic retry/backoff behavior.
test/test_wbi_core.py	Moves common_item initialization to setUpClass.
test/test_wbi_helpers.py	Introduces a fake MediaWiki API helper and uses monkeypatching to avoid real network calls in helper tests.
test/test_wbi_login.py	Adds fake responses and patches session/login methods to deterministically simulate login failure modes.

Comments suppressed due to low confidence (1)

test/conftest.py:469

• The autouse offline_network_mocks fixture is function-scoped (default). That means it will not apply to module import-time code or unittest.TestCase.setUpClass executions, so some tests can still perform real network calls even with the fixture present. Consider documenting this limitation and/or switching to a longer-lived patching approach (e.g., a session-scoped fixture using pytest.MonkeyPatch()), or ensuring tests don’t do network work in setUpClass/import time.

def offline_network_mocks(monkeypatch, request):
    module_name = request.module.__name__ if request.module else ''
    if module_name in SKIP_OFFLINE_PATCH_MODULES:
        return

    monkeypatch.setattr('wikibaseintegrator.entities.baseentity.BaseEntity._get', fake_baseentity_get)
    monkeypatch.setattr('wikibaseintegrator.wbi_helpers.mediawiki_api_call_helper', fake_mediawiki_api_call_helper)
    monkeypatch.setattr('wikibaseintegrator.wbi_helpers.execute_sparql_query', fake_execute_sparql_query)
    monkeypatch.setattr('wikibaseintegrator.wbi_fastrun.execute_sparql_query', fake_execute_sparql_query)
    monkeypatch.setattr('wikibaseintegrator.wbi_fastrun.FastRunContainer.get_prop_datatype', fake_get_prop_datatype)

[LeMyst]

@copilot rebase