[kgryte]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the test suite for math/base/special/atandf from relative tolerance testing (delta <= EPS * absf( expected )) to ULP difference testing via @stdlib/number/float32/base/assert/is-almost-same-value.
• updates both test/test.js and test/test.native.js, removing the absf and @stdlib/constants/float32/eps imports along with the delta/tol bookkeeping, and replacing the t.ok( delta <= tol, ... ) assertions with t.strictEqual( isAlmostSameValuef( y, e, 1 ), true, 'returns expected value' );.

The ULP bound was tightened to the measured minimum:

File	Fixture set	ULP
test/test.js	julia/negative.json (2003 values)	1
test/test.js	julia/positive.json (2003 values)	1
test/test.native.js	julia/negative.json (2003 values)	1
test/test.native.js	julia/positive.json (2003 values)	1

1 is the minimum: at 0 ULP, 970 of the 2003 values in each fixture set fail (for both the JavaScript and the C implementation), and at 1 ULP none fail.

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 modified; no source, fixtures, or documentation were touched.
• make test TESTS_FILTER=".*/math/base/special/atandf/.*" passes: 4009/4009 assertions for test/test.js and 4009/4009 for test/test.native.js. The native add-on was built locally (make install-node-addons NODE_ADDONS_PATTERN="atandf") so that test/test.native.js was actually exercised rather than skipped, and the suite was run twice at the final ULP value to confirm determinism.
• ESLint is clean against etc/eslint/.eslintrc.tests.js.

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, following the migration pattern established in previously merged conversions (e.g., math/base/special/logitf), with the ULP bound measured empirically against the full fixture set.

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