Sqla2 integration - Unit Tests

[CodeBeaverAI]

I started working from Sqla2 integration.

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🔄 3 test files added.
🐛 Found 2 bugs

🔄 Test Updates

I've added 3 tests. They all pass ☑️
New Tests:

• tests/test_setup.py
• tests/test_util.py
• test/test_table.py

No existing tests required updates.

🐛 Bug Detection

Potential issues:
- dataset/chunked.py

The failing test (test_flush_empty_queue) asserts that flushing an empty queue should not trigger the callback. However, in the implementation of ChunkedUpdate.flush, the callback is called unconditionally (if provided), even when the queue is empty. This results in tracker.called_with becoming [[]] (a list containing an empty list) rather than remaining an empty list, and thus the test fails. This indicates a bug in the code being tested.

• dataset/database.py

  The error occurs during teardown when the test framework calls db.close() a second time. The close() method of Database unconditionally sets self._engine to None after disposing of it and later calling close() again causes an AttributeError because it tries to call dispose() on a None object. This indicates that it's a bug in the code being tested: its close() method does not guard against multiple invocations. The test itself isn’t inherently wrong (it’s testing that after closing the database, further accesses raise an exception) and could be written differently; however, the underlying issue is that Database.close() isn’t robust against multiple calls.

☂️ Coverage Improvements

Coverage improvements by file:

• tests/test_setup.py

  New coverage: 100.00%
  Improvement: +100.00%

• tests/test_util.py

  New coverage: 98.98%
  Improvement: +98.98%

• test/test_table.py

  New coverage: 91.75%
  Improvement: +1.55%

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