Use streaming in all assertion comparisons consumers#14523

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Pierre-Sassoulas wants to merge 18 commits into

pytest-dev:mainfrom

Pierre-Sassoulas:stream-comparisons

Commits on May 30, 2026

[refactor] Make set comparison helpers yield strings
Pierre-Sassoulas
committed
[refactor] Make ``_compare_eq_any`` yield strings
Pierre-Sassoulas
committed
[refactor] Make ``util.assertrepr_compare`` yield strings
Pierre-Sassoulas
committed
[refactor] Add ``materialize_with_truncation`` for streaming explanations
Pierre-Sassoulas
committed
[refactor] Stream assertion explanations end-to-end through truncation
Pierre-Sassoulas
committed
[test] Cover the streaming truncation path and remove dead helper
Pierre-Sassoulas
committed
[docs] Add changelog for streaming assertion comparisons (#14523)
Pierre-Sassoulas
committed
[refactor] Keep ``pytest_assertrepr_compare`` returning ``list[str] | None``

Pierre-Sassoulas
and
claude
committed
[refactor] Tighten ``SetComparisonFunction`` to ``Iterator[str]``

Pierre-Sassoulas
and
claude
committed
[test] Cover the empty-iterable and plain-assert-mode branches

Pierre-Sassoulas
and
claude
committed
[test] Cover the dispatcher's fall-through-to-``None`` branch

Pierre-Sassoulas
and
claude
committed
[refactor] Drop the two ``continue``s in ``callbinrepr``

Pierre-Sassoulas
and
claude
committed
[refactor] Drop the hidden-line count from the truncation footer
Pierre-Sassoulas
committed
[refactor] Stream ``difflib.ndiff`` output line-by-line in ``_compare_eq_iterable``
Pierre-Sassoulas
committed
[perf] Make ``PrettyPrinter`` lazy via a budget-aware stream + sort fast path
Pierre-Sassoulas
committed
[refactor] Plumb ``truncation_limit_lines`` to ``_compare_eq_iterable``'s pformat cap
Pierre-Sassoulas
committed
[perf] Fast-path ``pformat_lines`` for sized inputs that fit in the budget
Pierre-Sassoulas
committed
[docs] Trim the streaming-truncation changelog
Pierre-Sassoulas
committed

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Use streaming in all assertion comparisons consumers#14523

Use streaming in all assertion comparisons consumers#14523
Pierre-Sassoulas wants to merge 18 commits into
pytest-dev:mainfrom
Pierre-Sassoulas:stream-comparisons

Commits on May 30, 2026

[refactor] Make set comparison helpers yield strings

[refactor] Make ``_compare_eq_any`` yield strings

[refactor] Make ``util.assertrepr_compare`` yield strings

[refactor] Add ``materialize_with_truncation`` for streaming explanations

[refactor] Stream assertion explanations end-to-end through truncation

[test] Cover the streaming truncation path and remove dead helper

[docs] Add changelog for streaming assertion comparisons (#14523)

[refactor] Keep ``pytest_assertrepr_compare`` returning ``list[str] | None``

[refactor] Tighten ``SetComparisonFunction`` to ``Iterator[str]``

[test] Cover the empty-iterable and plain-assert-mode branches

[test] Cover the dispatcher's fall-through-to-``None`` branch

[refactor] Drop the two ``continue``s in ``callbinrepr``

[refactor] Drop the hidden-line count from the truncation footer

[refactor] Stream ``difflib.ndiff`` output line-by-line in ``_compare_eq_iterable``

[perf] Make ``PrettyPrinter`` lazy via a budget-aware stream + sort fast path

[refactor] Plumb ``truncation_limit_lines`` to ``_compare_eq_iterable``'s pformat cap

[perf] Fast-path ``pformat_lines`` for sized inputs that fit in the budget

[docs] Trim the streaming-truncation changelog