test: migrate math/base/special/cflipsignf to ULP-based assertions

[kgryte]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates test/test.js and test/test.native.js of math/base/special/cflipsignf from relative-tolerance (EPS-based) assertions to ULP-difference assertions via @stdlib/number/float32/base/assert/is-almost-same-value, following the precedent of previously merged single-precision complex packages (e.g., math/base/special/csignumf, math/base/special/cinvf).
• removes the delta/tol computations, along with the now unused absf and EPS requires, and replaces the exact/tolerance branch in the fixture loop with t.strictEqual( isAlmostSameValue( ..., 1 ), true, 'returns expected value' ) for the real and imaginary components.
• uses a minimum required ULP value of 1 for both the JavaScript and native implementations. The value was measured by computing, for every fixture pair in test/fixtures/julia/data.json (2003 cases; 4006 component assertions), the smallest ULP argument for which isAlmostSameValue returns true, and taking the maximum. The measured minimum is 1; at 0, 4000 of the 4006 component assertions fail (with maxULP = 0, the assertion reduces to exact SameValue equality against the double-precision fixture values), so 1 cannot be tightened further.

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 native add-on was built locally (make install-node-addons NODE_ADDONS_PATTERN=math/base/special/cflipsignf) so that test/test.native.js was actually exercised rather than skipped, and the native implementation was independently confirmed to require the same minimum of 1 ULP.
• make test TESTS_FILTER=".*/math/base/special/cflipsignf/.*" was run twice at the final ULP value to confirm determinism: 4038/4038 assertions passing in test/test.js and 4038/4038 in test/test.native.js on both runs.
• ESLint is clean for both changed files using the project's test configuration (etc/eslint/.eslintrc.tests.js).
• No files other than the two test files were changed. The remaining assertions in these files (signed zeros, infinities, NaN) were exact comparisons already and are left untouched.

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

This pull request was authored by an automated Claude Code agent running as a scheduled task, mirroring the conventions established in prior merged ULP-migration pull requests for #11352.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/cflipsignf	$\\color{green}149/149$ $\\color{green}+100.00\\%$	$\\color{green}7/7$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}149/149$ $\\color{green}+100.00\\%$

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