test: add infinity tests

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/number/float64/base/ulp-difference/test/test.js

@@ -25,6 +25,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isPositiveFinite = require( '@stdlib/assert/is-positive-finite' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var SMALLEST_SUBNORMAL = require( '@stdlib/constants/float64/smallest-subnormal' );
+var MAX_VALUE = require( '@stdlib/constants/float64/max' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
 var ulpdiff = require( './../lib' );
@@ -82,6 +83,9 @@ tape( 'the function handles infinities', function test( t ) {
 	t.strictEqual( isPositiveFinite( ulpdiff( PINF, NINF ) ), true, 'returns expected value' );
 	t.strictEqual( isPositiveFinite( ulpdiff( NINF, PINF ) ), true, 'returns expected value' );
 
+	t.strictEqual( ulpdiff( MAX_VALUE, PINF ), 1.0, 'returns expected value' );
+	t.strictEqual( ulpdiff( -MAX_VALUE, NINF ), 1.0, 'returns expected value' );
+
 	t.end();
 });