[kgryte]

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 of stats/base/dists/gumbel/median from relative tolerance (EPS-based) assertions to ULP difference assertions via @stdlib/assert/is-almost-same-value.
• replaces the delta/tol tolerance branch (previously tol = 2.0 * EPS * abs( expected[ i ] )) with t.strictEqual( isAlmostSameValue( y, expected[ i ], 0 ), true, 'returns expected value' ), retaining the existing expected[ i ] !== null guard.
• removes the now-unused abs and EPS requires and the corresponding delta/tol variable declarations.

Final ULP constant: 0, for both the JavaScript and the native test suites.

The bound was tightened empirically. Starting from a high value and searching downward via a per-case minimum-ULP computation over the full fixture set (test/fixtures/julia/data.json, 100 fixture cases), the measured maximum ULP difference is 0 — every fixture value is reproduced bit-for-bit — so 0 is the minimum value at which the suites pass.

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 native add-on was built locally (make install-node-addons NODE_ADDONS_PATTERN="stats/base/dists/gumbel/median") so that test/test.native.js actually executed rather than being skipped; the native implementation also matches the fixtures exactly (max ULP difference 0).
• The package test suite was run twice at the final ULP value to confirm determinism: 110/110 assertions passing in test.js and 110/110 in test.native.js on both runs.
• make lint-javascript-tests TESTS_FILTER=".*/stats/base/dists/gumbel/median/.*" is clean.
• No files other than the two test files were changed.

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.

This pull request was authored by an automated Claude Code agent running as a scheduled task, following the conventions established in previously merged ULP migration pull requests for this issue.

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/gumbel/median	$\\color{green}182/182$ $\\color{green}+100.00\\%$	$\\color{green}9/9$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}182/182$ $\\color{green}+100.00\\%$

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