test: migrate simulate/iter/sawtooth-wave 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 simulate/iter/sawtooth-wave from relative tolerance testing to ULP difference testing, as described in [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352.
• replaces the delta/tol comparison blocks in test/test.js with t.strictEqual( isAlmostSameValue( actual.value, expected[ i ].value, N ), true, 'returns expected value' );, adds the @stdlib/assert/is-almost-same-value import, and removes the now unused @stdlib/math/base/special/abs and @stdlib/constants/float64/eps imports.

ULP bounds used, tightened to the measured minimum for each test case:

Test	ULP
generates a sawtooth wave (default)	0
supports specifying the waveform period	0
supports specifying the wave amplitude	0
supports specifying the phase offset (left shift)	0
supports specifying the phase offset (left shift; mod)	0
supports specifying the phase offset (right shift)	0
supports specifying the phase offset (right shift; mod)	0
supports limiting the number of iterations	1

All values except one are bit-for-bit exact, and thus use a bound of 0 ULP. The iter test case requires 1 ULP, as the returned value -0.5000000000000001 differs from the expected literal -0.5 by exactly one ULP; lowering that bound to 0 causes the assertion to fail, confirming 1 is the minimum. The suite (240 assertions) was run twice at the final bounds with identical results.

The package has no test/test.native.js, so no native test file required updating.

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.

Only lib/node_modules/@stdlib/simulate/iter/sawtooth-wave/test/test.js is modified. make test TESTS_FILTER=".*/simulate/iter/sawtooth-wave/.*" passes (240/240), and ESLint reports no problems for the modified file.

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 as part of an automated, unattended migration task. The ULP bounds were measured empirically by running the test suite rather than estimated.

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https://claude.ai/code/session_01WqqdPYJ7b95CKX13XpdtDH

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Coverage Report

Package	Statements	Branches	Functions	Lines
simulate/iter/sawtooth-wave	$\\color{green}305/305$ $\\color{green}+100.00\\%$	$\\color{green}32/32$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}305/305$ $\\color{green}+100.00\\%$

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