Description

Migrates the stats/base/dists/chisquare/cdf test suite from the old computed-tolerance idiom (delta/tol derived from EPS) to ULP-based assertions using @stdlib/assert/is-almost-same-value, per #11352.

Converted files:

• test/test.cdf.js
• test/test.factory.js
• test/test.native.js

test/test.js was left untouched (it only contains the exports smoke test; no tolerance comparisons).

ULP bound

All three files share the same fixture set (test/fixtures/julia/decimal_decimal.json) and the same underlying computation, so a single ULP constant was used across all of them:

• isAlmostSameValue( y, expected[i], 76 )

The bound of 76 was found by computing the exact ULP difference between actual and expected values across the full fixture (5015 cases) using @stdlib/number/float64/base/ulp-difference; the maximum observed difference was 76 ULPs. The full test suite was run twice at this bound to confirm deterministic results (no FMA/arch flakiness).

Verification

• test/test.cdf.js: 5015/5015 passing (run twice)
• test/test.factory.js: 5015/5015 passing (run twice)
• test/test.js: 3/3 passing
• test/test.native.js: no native binding available in this environment, so the (skip-gated) tests did not execute; the conversion mirrors the JS test files exactly.
• Only test files were changed; package.json did not need updates since @stdlib/assert/is-almost-same-value resolves via the existing monorepo module resolution (no explicit devDependencies entries are used elsewhere in this package either).
• eslint could not be run to completion in this sandboxed session due to an unrelated dependency-resolution issue in the reconstructed lint toolchain (reproduces identically on an already-merged, unmodified test file, so it is an environment/tooling issue, not something introduced by this diff). The diff was manually checked against the exact conventions used in prior merged conversions (e.g. test: migrate math/base/special/csc to ULP-based assertions #13828, test: migrate math/base/special/roundn to ULP-based assertions #13857, test: migrate stats/base/dists/t/quantile to ULP-based assertions #13847) — require ordering, removal of now-unused abs/EPS/delta/tol, and the t.strictEqual( isAlmostSameValue( actual, expected, N ), true, 'returns expected value' ) shape.

Ref: #11352

Generated by Claude Code