From 41137310cb9d088aecdfa9b3e0985c20bd0d679b Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Wed, 23 Sep 2026 22:25:28 +0000
Subject: [PATCH] test: migrate `stats/base/dists/invgamma/entropy` to
 ULP-based assertions

Replaces the relative tolerance comparison (`1e-10 * abs( expected[i] )`)
in `test/test.js` and `test/test.native.js` with ULP difference assertions
using `@stdlib/assert/is-almost-same-value`.

The ULP bound is `90112`, which is the measured minimum over the full
fixture set (200 cases) for both the JavaScript and C implementations;
`90111` fails one case.

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_01BX6G1VLr8YZ78tW8PGEvhn
---
 .../stats/base/dists/invgamma/entropy/test/test.js   | 12 ++----------
 .../base/dists/invgamma/entropy/test/test.native.js  | 12 ++----------
 2 files changed, 4 insertions(+), 20 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.js b/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.js
index 73af74fca059..bd49abb92a6d 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.js
@@ -21,7 +21,7 @@
 // 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 PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
@@ -95,10 +95,8 @@ tape( 'if provided `beta <= 0`, the function returns `NaN`', function test( t )
 
 tape( 'the function returns the differential entropy of an inverse gamma distribution', function test( t ) {
 	var expected;
-	var delta;
 	var alpha;
 	var beta;
-	var tol;
 	var i;
 	var y;
 
@@ -107,13 +105,7 @@ tape( 'the function returns the differential entropy of an inverse gamma distrib
 	beta = data.beta;
 	for ( i = 0; i < expected.length; i++ ) {
 		y = entropy( alpha[ i ], beta[ i ] );
-		if ( y === expected[ i ] ) {
-			t.strictEqual( y, expected[ i ], 'alpha: '+alpha[ i ]+', beta: '+beta[ i ]+', y: '+y+', expected: '+expected[ i ] );
-		} else {
-			delta = abs( y - expected[ i ] );
-			tol = 1e-10 * abs( expected[ i ] );
-			t.ok( delta <= tol, 'within tolerance. alpha: '+alpha[ i ]+'. beta: '+beta[ i ]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( y, expected[ i ], 90112 ), true, 'returns expected value' );
 	}
 	t.end();
 });
diff --git a/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.native.js b/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.native.js
index 0934dbe7ff43..e50b9c782dc7 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.native.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/invgamma/entropy/test/test.native.js
@@ -23,7 +23,7 @@
 var resolve = require( 'path' ).resolve;
 var tape = require( 'tape' );
 var tryRequire = require( '@stdlib/utils/try-require' );
-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 PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
@@ -104,10 +104,8 @@ tape( 'if provided `beta <= 0`, the function returns `NaN`', opts, function test
 
 tape( 'the function returns the differential entropy of an inverse gamma distribution', opts, function test( t ) {
 	var expected;
-	var delta;
 	var alpha;
 	var beta;
-	var tol;
 	var i;
 	var y;
 
@@ -116,13 +114,7 @@ tape( 'the function returns the differential entropy of an inverse gamma distrib
 	beta = data.beta;
 	for ( i = 0; i < expected.length; i++ ) {
 		y = entropy( alpha[ i ], beta[ i ] );
-		if ( y === expected[ i ] ) {
-			t.strictEqual( y, expected[ i ], 'alpha: '+alpha[ i ]+', beta: '+beta[ i ]+', y: '+y+', expected: '+expected[ i ] );
-		} else {
-			delta = abs( y - expected[ i ] );
-			tol = 1e-10 * abs( expected[ i ] );
-			t.ok( delta <= tol, 'within tolerance. alpha: '+alpha[ i ]+'. beta: '+beta[ i ]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( y, expected[ i ], 90112 ), true, 'returns expected value' );
 	}
 	t.end();
 });