[kgryte]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests for stats/incr/nanmrange from tolerance-based assertions to ULP-based assertions, replacing the hard-coded absolute tolerance in test/test.js

  t.ok( abs(v - expected[i]) < 0.01, 'returns expected value for window '+i );

  with

  t.strictEqual( isAlmostSameValue( v, expected[ i ], 1 ), true, 'returns expected value' );

• adds the @stdlib/assert/is-almost-same-value require and drops the now unused @stdlib/math/base/special/abs require.

Final ULP constant: 1. This is the measured minimum. The single inexact assertion compares the accumulator output for the window [3.14, 5.0] (i.e., 5.0 - 3.14, which evaluates to 1.8599999999999999) against the fixture value 1.86, which are 1 ULP apart. Verified by bisection: the test suite fails at 0 ULP and passes at 1 ULP. The suite was run twice at the final value to confirm determinism (no FMA/architecture variance); this test uses fixed, non-random input data.

Note that the previous 0.01 absolute tolerance was roughly 15 orders of magnitude looser than the actual error, so this change meaningfully tightens the assertion.

Only test/test.js is modified; no other 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 assertion message follows the convention established in the already-migrated sibling package stats/incr/mpcorr, where the converted assertion uses 'returns expected value' while the surrounding untouched assertions keep 'returns expected value for window '+i.
• Verification: make test TESTS_FILTER=".*/stats/incr/nanmrange/.*" passes (102/102), and make eslint-tests TESTS_FILTER=".*/stats/incr/nanmrange/.*" is clean.

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 written by Claude Code, which surveyed the repository for remaining tolerance-based tests, mirrored the idiom used by already-migrated packages, and determined the minimum passing ULP bound by bisection.

---

@stdlib-js/reviewers

---

Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/nanmrange	$\\color{green}142/142$ $\\color{green}+100.00\\%$	$\\color{green}7/7$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}142/142$ $\\color{green}+100.00\\%$

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