test: migrate stats/base/dists/discrete-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/discrete-uniform/median from relative tolerance assertions to ULP-based assertions.

Specifically, in test/test.js and test/test.native.js, the if ( y === expected[i] ) { ... } else { delta/tol ... } branch is replaced by

t.strictEqual( isAlmostSameValue( y, expected[ i ], 0 ), true, 'returns expected value' );

along with the corresponding require of @stdlib/assert/is-almost-same-value and the removal of the now unused @stdlib/math/base/special/abs and @stdlib/constants/float64/eps requires.

ULP bound: 0 in both test/test.js and test/test.native.js.

The bound was determined empirically by computing, for every entry in the Julia fixture set (1000 cases), the minimum ULP difference required for the assertion to hold. The maximum required over the full fixture set is 0, i.e., every returned value is bit-identical to the expected value, so 0 is the minimum admissible bound. The test suite was run twice at the final bound to confirm determinism (1008 assertions passing on each run).

This result is consistent with the implementations: the JS implementation returns ( a/2 ) + ( b/2 ) and the C implementation returns ( a + b ) / 2.0, both of which are exact for integer-valued a and b in the tested range, and both of which agree bit-for-bit with the fixture values. Note that the native tests are skipped when the native add-on has not been built, so the native bound was additionally checked by evaluating the C expression over the same fixture set.

Only the two test files are modified; no source, fixture, or documentation files are 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 conversion mirrors the idiom used in the previously merged sibling package stats/base/dists/discrete-uniform/stdev (#14337).

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 running as an unattended scheduled task: it selected the package, studied previously merged ULP migrations for the idiom, applied the test changes, and determined the minimum ULP bound empirically over the fixture set.

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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/discrete-uniform/median	$\\color{green}178/178$ $\\color{green}+100.00\\%$	$\\color{green}9/9$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}178/178$ $\\color{green}+100.00\\%$

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