Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests for stats/base/dists/betaprime/kurtosis from relative tolerance assertions to ULP difference assertions.

Specifically, in both test/test.js and test/test.native.js, the fixture loop previously branched on exact equality and otherwise compared a computed delta against a computed tol (320.0 * EPS * abs( expected[ i ] )). That branch is replaced with a single

t.strictEqual( isAlmostSameValue( y, expected[ i ], 369 ), true, 'returns expected value' );

assertion, @stdlib/assert/is-almost-same-value is added as a dependency of the tests, and the now unused @stdlib/math/base/special/abs and @stdlib/constants/float64/eps requires (along with the delta and tol locals) are removed.

ULP bound: 369 (both test/test.js and test/test.native.js).

The bound was tightened empirically. Measuring ulpdiff( y, expected[ i ] ) over the full 100-case Python fixture set yields a maximum ULP difference of 369, attained at alpha = 19.971069118488785, beta = 18.29265599414557. Sweeping the bound upwards from 0 confirms 369 is the minimum admissible value: running the suite at 368 fails exactly that one case, while 369 passes all of them. The JavaScript and C implementations were measured independently and both require the same bound of 369.

Verification:

• make test TESTS_FILTER=".*/stats/base/dists/betaprime/kurtosis/.*" — 119 passing in test/test.js.
• The native add-on was built locally (node-gyp rebuild) so that test/test.native.js was not skipped — 119 passing.
• Both suites were run twice at the final bound to confirm the result is deterministic (no FMA/architecture-dependent variation).
• make eslint-tests TESTS_FILTER=".*/stats/base/dists/betaprime/kurtosis/.*" — clean.

Only the two test files are changed; no source, fixture, benchmark, or documentation files were touched.

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 editorconfig pre-commit hook could not run in this environment because it attempts to download the editorconfig-checker binary from GitHub releases, which is not reachable here. The two changed files were instead checked manually for the relevant .editorconfig rules (LF line endings, UTF-8, tab indentation, no trailing whitespace, final newline).

Checklist

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

• Read, understood, and followed the [contributing guidelines][contributing].

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. Claude selected the package, mirrored the conversion idiom from previously merged ULP migration commits, measured the minimum ULP bound against the fixture set, and ran the tests and test linter locally.

@stdlib-js/reviewers

Generated by Claude Code