test: migrate blas/base/dspmv to ULP-based assertions

[Planeshifter]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests for blas/base/dspmv from relative tolerance testing to ULP difference testing, replacing the rtol * EPS * abs( expected ) comparisons in the isApprox helper with @stdlib/assert/is-almost-same-value. The idiom mirrors the already-migrated sibling package blas/base/dsymv.

Files changed: test/test.dspmv.js and test/test.ndarray.js. No non-test files are modified, and no test fixtures, expected values, or test cases were added, removed, or altered.

Every fixture-driven comparison in this package resolves exactly (ULP = 0), matching the result for the sibling packed/full-storage pair blas/base/dsymv. Bounds were determined by computing, for every compared element, the ULP difference between the actual and expected values via @stdlib/number/float64/base/ulp-difference, confirming a difference of 0 in every case.

test/test.dspmv.js and test/test.ndarray.js (all 10 fixture-driven assertions across both files):

Test	ULP	Previous rtol
row-major, sx=1, sy=1	0	2.0
column-major, sx=1, sy=1	0	2.0
row-major, sx=1, sy=2	0	2.0
column-major, sx=1, sy=2	0	2.0
row-major, sx=1, sy=-1	0	2.0
column-major, sx=1, sy=-1	0	2.0
row-major, sx=-1, sy=1	0	2.0
column-major, sx=-1, sy=1	0	2.0
complex access patterns (row-major)	0	2.0
complex access patterns (column-major)	0	2.0

Tests using exact assertions (t.strictEqual/t.deepEqual) were left unchanged. blas/base/dspmv has no native (test.native.js) test file.

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?

None.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

The bounds above were measured directly (not just probed via test runs): for each fixture, the actual output was computed by requiring the package's lib/dspmv.js and lib/ndarray.js implementations directly and diffing against the expected fixture values with @stdlib/number/float64/base/ulp-difference. The full JavaScript test suite (test/test.dspmv.js, test/test.ndarray.js, test/test.js) was then run twice at ULP = 0 with identical, fully passing results (97, 97, and 5 assertions respectively), confirming determinism.

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
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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. The migration follows the idiom established in the already-migrated blas/base/dsymv, and the ULP bounds were measured empirically (via direct ULP-difference computation against the fixtures) rather than guessed.

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🤖 Generated with Claude Code

https://claude.ai/code/session_017ehfiwCH2DcnegSenmXrSc

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/dspmv	$\\color{green}428/428$ $\\color{green}+100.00\\%$	$\\color{green}47/47$ $\\color{green}+100.00\\%$	$\\color{green}3/3$ $\\color{green}+100.00\\%$	$\\color{green}428/428$ $\\color{green}+100.00\\%$

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

[kgryte]

ULP values need to be inlined.