[RFC] Shared test constants and helpers for argument handling coverage#54

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eerxuan wants to merge 3 commits intodocumentdb:mainfrom

eerxuan:divide-test-refactor-4

Commits on Apr 7, 2026

Refactor divide tests: split into 3 files, add type validation, argument handling, edge cases
eerxuan
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Reduce test boilerplate: shared constants, parametrize helpers, ErrorCode type
eerxuan
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Add expression type testing: expression_type_cases helper, inline setup/execute/assert
eerxuan
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