From cb5d96d913924d624ded1bb56d0d64820e020a24 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 8 Oct 2026 22:24:32 +0000
Subject: [PATCH] test: migrate `stats/incr/nangmean` to ULP-based assertions

Replaces relative tolerance comparisons in the test suite with
`@stdlib/assert/is-almost-same-value` ULP difference assertions.

ULP bounds were tightened to the measured minimum which still passes
over the full set of test cases:

-   incremental geometric mean accumulation: 2 ULP
-   current geometric mean on recall: 1 ULP

Lowering either bound by one causes a test failure, and the suite was
run twice at the final bounds to confirm determinism.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HwRj94hUX3dG7FRc2TVZoc
---
 .../@stdlib/stats/incr/nangmean/test/test.js  | 20 +++----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/incr/nangmean/test/test.js b/lib/node_modules/@stdlib/stats/incr/nangmean/test/test.js
index b4d942a1915b..2965b4243826 100644
--- a/lib/node_modules/@stdlib/stats/incr/nangmean/test/test.js
+++ b/lib/node_modules/@stdlib/stats/incr/nangmean/test/test.js
@@ -21,12 +21,11 @@
 // MODULES //
 
 var tape = require( 'tape' );
+var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
 var ln = require( '@stdlib/math/base/special/ln' );
 var exp = require( '@stdlib/math/base/special/exp' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
-var abs = require( '@stdlib/math/base/special/abs' );
-var EPSILON = require( '@stdlib/constants/float64/eps' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var incrnangmean = require( './../lib' );
 
@@ -47,10 +46,8 @@ tape( 'the function returns an accumulator function', function test( t ) {
 tape( 'the accumulator function incrementally computes a geometric mean', function test( t ) {
 	var expected;
 	var actual;
-	var delta;
 	var data;
 	var prod;
-	var tol;
 	var acc;
 	var N;
 	var d;
@@ -72,23 +69,15 @@ tape( 'the accumulator function incrementally computes a geometric mean', functi
 			j += 1;
 		}
 		actual = acc( d );
-		if ( actual === expected ) {
-			t.strictEqual( actual, expected, 'returns expected value. d: '+d+'.' );
-		} else {
-			delta = abs( expected - actual );
-			tol = 1.5 * EPSILON * abs( expected );
-			t.strictEqual( delta <= tol, true, 'within tolerance. d: '+d+'. Expected: '+expected+'. Actual: '+actual+'. Delta: '+delta+'. Tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual, expected, 2 ), true, 'returns expected value' );
 	}
 	t.end();
 });
 
 tape( 'if not provided an input value, the accumulator function returns the current geometric mean', function test( t ) {
 	var expected;
-	var delta;
 	var data;
 	var acc;
-	var tol;
 	var i;
 
 	data = [ 2.0, NaN, 3.0, 1.0 ];
@@ -98,10 +87,7 @@ tape( 'if not provided an input value, the accumulator function returns the curr
 		acc( data[ i ] );
 	}
 	expected = 1.8171205928321397;
-	delta = abs( expected - acc() );
-	tol = EPSILON * abs( expected );
-
-	t.strictEqual( delta <= tol, true, 'within tolerance. Expected: '+expected+'. Actual: '+acc()+'. Delta: '+delta+'. Tol: '+tol+'.' );
+	t.strictEqual( isAlmostSameValue( acc(), expected, 1 ), true, 'returns expected value' );
 	t.end();
 });