[kgryte]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests for math/base/special/roundb from relative tolerance testing to ULP difference testing, per [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352.

Specifically, in both test/test.js and test/test.native.js, the delta/tol computation in the "the function supports rounding very small numbers (including subnormals)" test is replaced with a single isAlmostSameValue assertion, the now-unused @stdlib/constants/float64/eps and @stdlib/math/base/special/abs requires are removed, and @stdlib/assert/is-almost-same-value is added.

Final ULP constants:

File	ULP
test/test.js	1
test/test.native.js	1

Both values are the measured minimum. Over the full set of 17 fixture cases, the maximum observed ULP difference is 1 for both the JavaScript and C implementations (5 of the 17 cases differ by exactly 1 ULP; the remaining 12 are bit-for-bit exact). Lowering the bound to 0 fails, so 1 is the tightest bound which passes.

The suite was run twice at the final ULP value, with the native add-on built locally so that test/test.native.js actually executes rather than being skipped. Both runs were green and identical (test.js: 668/668; test.native.js: 658/658), confirming no FMA/architecture-related non-determinism.

Only the two test files are modified.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

The conversion mirrors the idiom established in math/base/special/croundn (#14327), which has a structurally identical subnormal rounding test.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

This PR was authored by Claude Code running as an unattended scheduled task: it selected the package, studied prior conversions in the repository to match the established idiom, applied the edits, and measured the minimum ULP bound by running the test suite.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/roundb	$\\color{green}203/203$ $\\color{green}+100.00\\%$	$\\color{green}24/24$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}203/203$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.