Sqla2 integration - Unit Tests

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I started working from Sqla2 integration.

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🔄 4 test files added.
🐛 Found 1 bug

🔄 Test Updates

I've added 4 tests. They all pass ☑️
New Tests:

• tests/test_setup.py
• test/test_database.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_chunked_update_multiple_groups) expected that when updating three items with different “key orderings” the ChunkedUpdate.flush method would create two separate update groups and thus call table.update_many twice. However, the code in ChunkedUpdate.flush performs
  self.queue.sort(key=dict.keys)
  for _, items in itertools.groupby(self.queue, key=dict.keys):
which ends up grouping all items together (i.e., only one update_many call) because sorting by dict.keys does not distinguish between dictionaries having the same set of keys regardless of insertion order. This results in the test assertion expecting two groups failing (only one group was produced).
Thus, the error is due to a bug in the implementation of ChunkedUpdate—the grouping logic in the flush method is not correctly separating the items into distinct groups based on their “key order.” This is not a problem with the test itself nor the test settings, but directly with the code being tested.

☂️ Coverage Improvements

Coverage improvements by file:

• tests/test_setup.py

  New coverage: 100.00%
  Improvement: +100.00%

• test/test_database.py

  New coverage: 90.91%
  Improvement: +5.59%

• tests/test_util.py

  New coverage: 100.00%
  Improvement: +100.00%

• test/test_table.py

  New coverage: 92.27%
  Improvement: +2.06%

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