test: migrate stats/strided/dsemtk to ULP-based assertions

[Planeshifter]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• Migrates the test suite for stats/strided/dsemtk from relative-tolerance (EPS-based) floating-point comparisons to ULP-difference based assertions using @stdlib/assert/is-almost-same-value, per the tracking issue [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352.
• Converts all four test files for the package: test/test.dsemtk.js, test/test.dsemtk.native.js, test/test.ndarray.js, and test/test.ndarray.native.js. Each file had two floating-point comparisons using the old delta <= tol idiom (tol = 1.0 * EPS * abs( expected )), which are now t.strictEqual( isAlmostSameValue( v, expected, 1 ), true, 'returns expected value' ).
• Removes the now-unused abs and EPS requires (and the delta/tol local variable declarations) from each test file.
• The minimum ULP tolerance was determined empirically: starting from a high value and lowering it, ULP=0 fails for both floating-point assertions, while ULP=1 passes all cases. The full package test suite was run twice at ULP=1 to confirm deterministic (non-flaky) results.
• No other test cases (exact t.strictEqual/isnan checks) were touched, consistent with the migration guidance in [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352.

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.

Final ULP constant: 1 (measured minimum; 0 fails, 1 passes deterministically across repeated runs). No named ULP constant was introduced, matching the pattern already used in this package family's converted tests (e.g. stats/strided/dsem, stats/strided/dsempn), which pass the literal ULP value directly to isAlmostSameValue.

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 studied prior-art conversions in the same package family (stats/strided/dsem, stats/strided/dsempn) and the tracking issue #11352 before authoring the change, and empirically determined the minimum ULP tolerance by running the test suite.

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@stdlib-js/reviewers

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🤖 Generated with Claude Code

https://claude.ai/code/session_01GfhKkXU78VTa7ZEDFn21v7

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/strided/dsemtk	$\\color{green}350/350$ $\\color{green}+100.00\\%$	$\\color{green}13/13$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}350/350$ $\\color{green}+100.00\\%$

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