test: migrate math/base/special/asec to ULP-based assertions

[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/asec from relative tolerance comparisons (delta <= tol, where tol = 1.0 * EPS * abs( expected[i] )) to ULP difference assertions using @stdlib/assert/is-almost-same-value, per the idiom established in [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352.
• removes the now unused @stdlib/constants/float64/eps and @stdlib/math/base/special/abs requires, along with the delta/tol locals and the y === expected[i] exact-match branch, in both test/test.js and test/test.native.js.

The ULP bounds were measured against the full fixture set (4006 fixture values across 8 Julia fixture files) and tightened to the minimum integer which still passes:

Fixture	Interval	ULP
medium_negative	[-3.0,-1.0]	1
medium_positive	[1.0,3.0]	1
large_positive	[3.0,100.0]	1
large_negative	[-100.0,-3.0]	1
larger_positive	[100.0,1000.0]	1
larger_negative	[-1000.0,-100.0]	1
huge_negative	[-1e200,-1e208]	0
huge_positive	[1e300,1e308]	0

The measured maximum ULP difference over each fixture equals the value used, so each bound is minimal (e.g., the huge_* fixtures are bit-for-bit exact, and lowering any 1 to 0 fails). The JavaScript and native C implementations were measured independently and agree exactly, so test/test.js and test/test.native.js use identical ULP values. Both suites were run twice at the final values to confirm determinism (4013 assertions passing per file, native add-on built locally).

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.

Only the two test files are changed; no source, fixture, or documentation changes.

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

This PR was authored by Claude Code, which studied the prior conversions in this tracking issue, applied the same idiom to math/base/special/asec, and measured the minimum ULP bounds empirically against the fixture data.

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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/asec	$\\color{green}160/160$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}160/160$ $\\color{green}+100.00\\%$

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