Python: Add more unit tests to remain 90% test coverage result

[JonasJ-ap]

Feature Request / Improvement

In #6398, python unit tests are separated into three groups: unmarked, s3, and adlfs. This cause the overall test coverage of unmarked group (majority) drops from 90% to 88%. We may want to add more tests or revise the Makefile to make more tests count when computing the test coverage.

iceberg/python/Makefile

Lines 28 to 33 in ef6b1da

	test:
	poetry run coverage run --source=pyiceberg/ -m pytest tests/ -m unmarked ${PYTEST_ARGS}
	poetry run coverage report -m --fail-under=90
	poetry run coverage html
	poetry run coverage xml

Query engine

None