Replace `boost_assert` by proper testing logic in the context of BPL tests.

Boost.Python uses calls to `boost_assert` in its testing infrastructure. That macro suffers the same problems as the standard `assert` macro: it may evaluate to a no-op if `NDEBUG` is defined.

We need to find an alternative (which doesn't have to be a macro at all !), and make the corresponding adjustments throughout the Boost.Python test base.

檢查 Boost.Python 的測試基礎架構並找出所有 boost_assert 的使用位置。檢查定義 NDEBUG 時現有測試的行為，然後確定替代項所需的行為，並更新 test-base 中受影響的使用位置。只要無論 assertions 啟用或停用，測試仍能可靠地回報失敗，就算完成。

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