test: migrate math/base/special/ahaversinf to ULP-based testing

[Planeshifter]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates test/test.js and test/test.native.js in math/base/special/ahaversinf from relative-tolerance (EPS-based) assertions to ULP-difference assertions via @stdlib/number/float32/base/assert/is-almost-same-value (the single-precision variant, following the pattern established in math/base/special/acothf and math/base/special/atanhf), with expected values coerced to single precision via @stdlib/number/float64/base/to-float32.
• uses the minimum required ULP values, verified by direct ULP-difference computation over the test fixtures using @stdlib/number/float32/base/ulp-difference:
  • data fixtures: maximum ULP difference of 2 (32 cases exceed ULP 1, so 2 is minimal).
  • small_positive fixtures: exact after single-precision coercion (maximum ULP difference of 0), so plain t.strictEqual( y, e, 'returns expected value' ) is used instead of isAlmostSameValue.
• removes the now-unused @stdlib/math/base/special/absf require and the delta/tol variables; the @stdlib/constants/float32/eps require is retained, as it is still used by the out-of-domain (NaN) range tests.

Native (C) results are bit-identical to the JavaScript implementation on the test machine (arm64/clang): the same ULP values apply to both files, and no compiler-divergence NOTE annotation is needed. The native test suite was built and run successfully (all assertions passing), and the full JavaScript test harness passed as well.

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 minimum ULP values were independently re-verified by an adversarial review pass which recomputed the maximum ULP difference per fixture block directly against the unchanged implementation.

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 written by Claude Code as part of an automated migration of math/base/special test suites to ULP-based testing (issue #11352), including independent recomputation of the minimum ULP tolerances, and was reviewed by a separate adversarial verification pass before submission.

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@stdlib-js/reviewers

[stdlib-bot]

Hello! 👋

We've noticed that you've been opening a number of PRs addressing good first issues. Thank you for your interest and enthusiasm!

Now that you've made a few contributions, we suggest no longer working on good first issues. Instead, we encourage you to prioritize cleaning up any PRs which have yet to be merged and then proceed to work on more involved tasks.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/ahaversinf	$\\color{green}170/170$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}170/170$ $\\color{green}+100.00\\%$

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