[kgryte]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests for stats/base/dists/beta/quantile from relative tolerance testing (delta <= tol, where tol = 20.0 * EPS * abs( expected )) to ULP difference testing using @stdlib/assert/is-almost-same-value.
• replaces the if ( y === expected[i] ) { ... } else { ... } tolerance branches with t.strictEqual( isAlmostSameValue( y, expected[ i ], N ), true, 'returns expected value' );.
• removes the now unused @stdlib/math/base/special/abs and @stdlib/constants/float64/eps requires, along with the delta and tol variable declarations.

Only test/test.quantile.js and test/test.factory.js are modified; the package has no test/test.native.js. test/test.js was left untouched, as it contains no tolerance-based assertions.

ULP bounds

Each fixture set is asserted against the measured minimum ULP bound for that fixture set, and the same bound is used for the corresponding test in both test.quantile.js and test.factory.js:

Fixture	ULP	Measured minimum
both_large.json	18	18 (fails at 17)
large_alpha.json	9	9 (fails at 8)
large_beta.json	29	29 (fails at 28)

The bounds were determined by starting from a high ULP value and lowering to the smallest integer which still passes over the full fixture set (1000 values per fixture). Decrementing any of the three bounds by one causes failures (1, 3, and 1 assertions, respectively), confirming the bounds are tight. The full suite was run twice at the final values with identical results (3023 + 3021 + 3 assertions passing, no failures).

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.

Verification performed locally:

• make test TESTS_FILTER=".*/stats/base/dists/beta/quantile/.*" — passing (run twice).
• ESLint against etc/eslint/.eslintrc.tests.js — 0 errors, 0 warnings.

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 PR was authored by Claude Code, running as an unattended scheduled task, mirroring the idiom established by previously merged ULP migration PRs. The ULP bounds were measured empirically, and the tests and linter were run locally.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/beta/quantile	$\\color{green}234/234$ $\\color{green}+100.00\\%$	$\\color{green}23/23$ $\\color{green}+100.00\\%$	$\\color{green}3/3$ $\\color{green}+100.00\\%$	$\\color{green}234/234$ $\\color{green}+100.00\\%$

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