test: migrate stats/incr/rss 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/incr/rss from relative tolerance testing to ULP difference testing.
• replaces the @stdlib/math/base/special/abs and @stdlib/constants/float64/eps requires with @stdlib/assert/is-almost-same-value.
• removes the delta/tol scratch variables and the actual === expected branch, replacing each comparison with t.strictEqual( isAlmostSameValue( actual, expected, 0 ), true, 'returns expected value' );.

Only test/test.js is modified; the package has no test/test.native.js.

ULP bounds

The package has a single test file, and both affected test cases use the same bound:

File	ULP constant	Notes
test/test.js	0	measured minimum

The previous assertions allowed 1.0 * EPS * abs( expected ). Measuring the actual ULP difference for every assertion in the fixture set (via @stdlib/number/float64/base/ulp-difference) yields 0 for all seven comparisons, so the accumulator is bit-exact against the naive reference for this data and 0 is the minimum required ULP value.

Verification:

• make test TESTS_FILTER=".*/stats/incr/rss/.*" → 11 passing, 0 failing.
• Suite run twice at the final ULP value to confirm determinism (no FMA/arch variation); identical results both runs.
• Test-file ESLint (etc/eslint/.eslintrc.tests.js, via the pre-commit hook) reports no problems.

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 ULP value of 0 means isAlmostSameValue reduces to a SameValue comparison here. This matches the idiom already used in previously migrated packages in this family (e.g. stats/incr/mstdev, simulate/iter/periodic-sinc), where exactly representable results are asserted with a ULP value of 0 rather than being left as a tolerance comparison.

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 the already-migrated packages to mirror the project's established idiom, applied the migration, and measured the minimum ULP bound empirically.

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🤖 Generated with Claude Code

https://claude.ai/code/session_01Rg1yBjjTZyER7PGJBCkzga

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/rss	$\\color{green}124/124$ $\\color{green}+100.00\\%$	$\\color{green}6/6$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}124/124$ $\\color{green}+100.00\\%$

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