From 5e2da6407b8ea3d3edab3199eb009d178ea3277c Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sun, 11 Oct 2026 06:31:25 +0000
Subject: [PATCH] test: migrate `stats/incr/covariance` to ULP-based assertions

Replaces relative tolerance assertions with `isAlmostSameValue` ULP
difference assertions, using the minimum required ULP values.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A8ZXSNMg8YzKdWufa2d5kW
---
 .../@stdlib/stats/incr/covariance/test/test.js    | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/incr/covariance/test/test.js b/lib/node_modules/@stdlib/stats/incr/covariance/test/test.js
index 91d30b73bd26..c80f6b2609f0 100644
--- a/lib/node_modules/@stdlib/stats/incr/covariance/test/test.js
+++ b/lib/node_modules/@stdlib/stats/incr/covariance/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 incrcovariance = require( './../lib' );
 
 
@@ -100,8 +99,6 @@ tape( 'the function returns an accumulator function (known means)', function tes
 tape( 'the accumulator function incrementally computes an unbiased sample covariance', function test( t ) {
 	var expected;
 	var actual;
-	var delta;
-	var tol;
 	var acc;
 	var x;
 	var y;
@@ -127,9 +124,7 @@ tape( 'the accumulator function incrementally computes an unbiased sample covari
 		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 +133,6 @@ tape( 'the accumulator function incrementally computes an unbiased sample covari
 tape( 'the accumulator function incrementally computes an unbiased sample covariance (known means)', function test( t ) {
 	var expected;
 	var actual;
-	var delta;
-	var tol;
 	var acc;
 	var x;
 	var y;
@@ -165,9 +158,7 @@ tape( 'the accumulator function incrementally computes an unbiased sample covari
 		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 ], 0 ), true, 'returns expected value' );
 		}
 	}
 	t.end();