test: add tests

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---

Author: aayush0325

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

@@ -0,0 +1,113 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var PINF = require( '@stdlib/constants/float64/pinf' );
+var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
+var dlapy3 = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof dlapy3, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns `NaN` if either argument is `NaN` but not `+-infinity`', function test( t ) {
+	var h;
+
+	h = dlapy3( NaN, 3.14, 2.0 );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( 3.14, NaN, 2.0 );
+	t.strictEqual( isnan( h ), true, 'returns expected value' );
+
+	h = dlapy3( 3.14, 2.0, 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 returns `+0` if both arguments are `+-0`', function test( t ) {
+	var h;
+
+	h = dlapy3( +0.0, +0.0, +0.0 );
+	t.strictEqual( isPositiveZero( h ), true, 'returns expected value' );
+
+	h = dlapy3( -0.0, +0.0, -0.0 );
+	t.strictEqual( isPositiveZero( h ), true, 'returns expected value' );
+
+	h = dlapy3( +0.0, -0.0, 0.0 );
+	t.strictEqual( isPositiveZero( h ), true, 'returns expected value' );
+
+	h = dlapy3( -0.0, -0.0, -0.0 );
+	t.strictEqual( isPositiveZero( h ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function computes the euclidian norm', function test( t ) {
+	var h;
+
+	h = dlapy3( 1234.0, 7863.0, 1298.0 );
+	t.strictEqual( h, 8064.3864614736813, 'returns expected value' );
+
+	h = dlapy3( 7.0, 9.0, 12.0 );
+	t.strictEqual( h, 16.552945357246848, 'returns expected value' );
+
+	h = dlapy3( 3.0, 4.0, 12.0 );
+	t.strictEqual( h, 13.0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function avoids overflow', function test( t ) {
+	var h;
+
+	h = sqrt( pow( 1.0e308, 2 ) + pow( 1.0e308, 2 ) + pow( 1.0e308, 2 ) );
+	t.strictEqual( h, PINF, 'returns expected value' );
+
+	h = dlapy3( 1.0e308, 1.0e308, 1.0e308 );
+	t.strictEqual( h, 1.7320508075688772e+308, 'avoids overflow' );
+
+	t.end();
+});
+
+tape( 'the function avoids underflow', function test( t ) {
+	var h;
+
+	h = sqrt( pow( 1.0e-200, 2 ) + pow( 1e-200, 2 ) + pow( 1e-200, 2 ) );
+	t.strictEqual( h, 0.0, 'returns 0' );
+
+	h = dlapy3( 1.0e-200, 1.0e-200, 1.0e-200 );
+	t.strictEqual( h, 1.7320508075688772e-200, 'avoids underflow' );
+
+	t.end();
+});