test: migrate stats/base/dists/uniform/median to ULP-based assertions

[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/uniform/median from relative tolerance testing to ULP difference testing.
• replaces the delta/tol comparison in test/test.js and test/test.native.js with t.strictEqual( isAlmostSameValue( y, expected[ i ], 0 ), true, 'returns expected value' );, adding the @stdlib/assert/is-almost-same-value require and removing the now unused @stdlib/math/base/special/abs and @stdlib/constants/float64/eps requires.

Final ULP constant: 0 for both test/test.js and test/test.native.js.

How the minimum was measured: the conversion started from a bound of 64, and the maximum ULP distance between the returned values and the Julia fixture values was then measured across the full fixture set (1000 values). That maximum is 0 — every returned value matches its fixture bit-for-bit — so 0 is both the measured minimum and the tightest bound expressible. This is expected, since the JavaScript implementation computes 0.5 * ( a + b ) and the C implementation computes ( a + b ) / 2.0; scaling by a power of two is exact, so both round identically.

The native add-on was built locally so that test/test.native.js actually executed rather than being skipped. The full suite (1008 assertions in test.js, 1008 in test.native.js) was run twice at the final bound with identical results, confirming determinism.

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, fixture, or documentation changes.

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

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• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
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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 as part of an automated, maintainer-configured task for migrating packages to ULP-based test assertions. The conversion mirrors the idiom established in previously merged migrations (e.g. stats/base/dists/triangular/mean), and the ULP bound was determined empirically by measuring ULP distances over the fixtures and running the package's test suite.

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https://claude.ai/code/session_01H7wkNLFGNTxtsRbFVDWC6b

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/uniform/median	$\\color{green}175/175$ $\\color{green}+100.00\\%$	$\\color{green}7/7$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}175/175$ $\\color{green}+100.00\\%$

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