From 06d24097219b7625e0adeb0a85394b9ce37052c7 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 8 Oct 2026 10:24:31 +0000
Subject: [PATCH] test: migrate `stats/incr/apcorr` to ULP-based assertions

Replaces computed relative-tolerance comparisons in the `stats/incr/apcorr`
test suite with `@stdlib/assert/is-almost-same-value` ULP-based assertions.

The ULP bounds were tightened to the measured minimum which still passes
over the full set of test values: 4 ULP for the unknown means test and
1 ULP for the known means test.

Ref: https://github.com/stdlib-js/stdlib/issues/11352

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015maoYHf9sFNS4w6oCmCo5b
---
 .../@stdlib/stats/incr/apcorr/test/test.js    | 23 +++----------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/incr/apcorr/test/test.js b/lib/node_modules/@stdlib/stats/incr/apcorr/test/test.js
index c021d767f8f4..f4001a164e4f 100644
--- a/lib/node_modules/@stdlib/stats/incr/apcorr/test/test.js
+++ b/lib/node_modules/@stdlib/stats/incr/apcorr/test/test.js
@@ -21,9 +21,8 @@
 // MODULES //
 
 var tape = require( 'tape' );
-var abs = require( '@stdlib/math/base/special/abs' );
+var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var EPS = require( '@stdlib/constants/float64/eps' );
 var incrapcorr = require( './../lib' );
 
 
@@ -100,8 +99,6 @@ tape( 'the function returns an accumulator function (known means)', function tes
 tape( 'the accumulator function incrementally computes a sample absolute correlation coefficient', function test( t ) {
 	var expected;
 	var actual;
-	var delta;
-	var tol;
 	var acc;
 	var x;
 	var y;
@@ -124,13 +121,7 @@ tape( 'the accumulator function incrementally computes a sample absolute correla
 
 	for ( i = 0; i < x.length; i++ ) {
 		actual = acc( x[ i ], y[ i ] );
-		if ( actual === expected[ i ] ) {
-			t.strictEqual( actual, expected[ i ], 'returns expected result. x: '+x[i]+'. y: '+y[i]+'.' );
-		} else {
-			delta = abs( expected[ i ] - actual );
-			tol = 3.7 * EPS * abs( expected[ i ] );
-			t.strictEqual( delta <= tol, true, 'x: '+x[i]+'. y: '+y[i]+'. expected: '+expected[i]+'. actual: '+actual+'. tol: '+tol+'. delta: '+delta+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual, expected[ i ], 4 ), true, 'returns expected value' );
 	}
 	t.end();
 });
@@ -138,8 +129,6 @@ tape( 'the accumulator function incrementally computes a sample absolute correla
 tape( 'the accumulator function incrementally computes a sample absolute correlation coefficient (known means)', function test( t ) {
 	var expected;
 	var actual;
-	var delta;
-	var tol;
 	var acc;
 	var x;
 	var y;
@@ -162,13 +151,7 @@ tape( 'the accumulator function incrementally computes a sample absolute correla
 
 	for ( i = 0; i < x.length; i++ ) {
 		actual = acc( x[ i ], y[ i ] );
-		if ( actual === expected[ i ] ) {
-			t.strictEqual( actual, expected[ i ], 'returns expected result. x: '+x[i]+'. y: '+y[i]+'.' );
-		} else {
-			delta = abs( expected[ i ] - actual );
-			tol = EPS * abs( expected[ i ] );
-			t.strictEqual( delta <= tol, true, 'x: '+x[i]+'. y: '+y[i]+'. expected: '+expected[i]+'. actual: '+actual+'. tol: '+tol+'. delta: '+delta+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual, expected[ i ], 1 ), true, 'returns expected value' );
 	}
 	t.end();
 });