test: add NaN tests

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

Author: kgryte

lib/node_modules/@stdlib/lapack/base/dlapy3/test/test.js

@@ -25,6 +25,7 @@ var PINF = require( '@stdlib/constants/float64/pinf' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var dlapy3 = require( './../lib' );
 
 
@@ -36,7 +37,7 @@ tape( 'main export is a function', function test( t ) {
 	t.end();
 });
 
-tape( 'the function returns `+0` if both arguments are `+-0`', function test( t ) {
+tape( 'the function returns `+0` if all arguments are `+-0`', function test( t ) {
 	var h;
 
 	h = dlapy3( +0.0, +0.0, +0.0 );
@@ -54,6 +55,33 @@ tape( 'the function returns `+0` if both arguments are `+-0`', function test( t
 	t.end();
 });
 
+tape( 'the function returns `NaN` if one or more arguments is `NaN`', function test( t ) {
+	var h;
+
+	h = dlapy3( NaN, 0.0, 0.0 );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( 0.0, NaN, 0.0 );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( 0.0, 0.0, NaN );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( NaN, NaN, 0.0 );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( NaN, 0.0, NaN );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( 0.0, NaN, NaN );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( NaN, NaN, NaN );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function computes the euclidian norm', function test( t ) {
 	var h;