text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2020 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 resolve = require( 'path' ).resolve;
  var tape = require( 'tape' );
  var floor = require( '@stdlib/math-base-special-floor' );
  var isnan = require( '@stdlib/math-base-assert-is-nan' );
  var Float32Array = require( '@stdlib/array-float32' );
  var tryRequire = require( '@stdlib/utils-try-require' );
  
  
  // VARIABLES //
  
  var sdssumpw = tryRequire( resolve( __dirname, './../lib/ndarray.native.js' ) );
  var opts = {
  	'skip': ( sdssumpw instanceof Error )
  };
  
  
  // TESTS //
  
  tape( 'main export is a function', opts, function test( t ) {
  	t.ok( true, __filename );
  	t.strictEqual( typeof sdssumpw, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function has an arity of 4', opts, function test( t ) {
  	t.strictEqual( sdssumpw.length, 4, 'has expected arity' );
  	t.end();
  });
  
  tape( 'the function calculates the sum of all strided array elements', opts, function test( t ) {
  	var x;
  	var v;
  	var i;
  
  	x = new Float32Array( [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0, 0.0, -3.0, 3.0 ] );
  	v = sdssumpw( x.length, x, 1, 0 );
  	t.strictEqual( v, 3.0, 'returns expected value' );
  
  	x = new Float32Array( [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ] );
  	v = sdssumpw( x.length, x, 1, 0 );
  	t.strictEqual( v, 3.0, 'returns expected value' );
  
  	x = new Float32Array( [ -4.0, -4.0 ] );
  	v = sdssumpw( x.length, x, 1, 0 );
  	t.strictEqual( v, -8.0, 'returns expected value' );
  
  	x = new Float32Array( [ NaN, 4.0 ] );
  	v = sdssumpw( x.length, x, 1, 0 );
  	t.strictEqual( isnan( v ), true, 'returns expected value' );
  
  	x = new Float32Array( [ 1.0, 1.0e38, 1.0, -1.0e38 ] );
  	v = sdssumpw( x.length, x, 1, 0 );
  	t.strictEqual( v, 0.0, 'returns expected value' );
  
  	x = new Float32Array( 1e3 );
  	for ( i = 0; i < 1e3; i++ ) {
  		x[ i ] = i + 1;
  	}
  	v = sdssumpw( x.length, x, 1, 0 );
  	t.strictEqual( v, 500500.0, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `0.0`', opts, function test( t ) {
  	var x;
  	var v;
  
  	x = new Float32Array( [ 1.0, -2.0, -4.0, 5.0, 3.0 ] );
  
  	v = sdssumpw( 0, x, 1, 0 );
  	t.strictEqual( v, 0.0, 'returns expected value' );
  
  	v = sdssumpw( -1, x, 1, 0 );
  	t.strictEqual( v, 0.0, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'if provided an `N` parameter equal to `1`, the function returns the first indexed element', opts, function test( t ) {
  	var x;
  	var v;
  
  	x = new Float32Array( [ 1.0, -2.0, -4.0, 5.0, 3.0 ] );
  
  	v = sdssumpw( 1, x, 1, 0 );
  	t.strictEqual( v, 1.0, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'the function supports a `stride` parameter', opts, function test( t ) {
  	var N;
  	var x;
  	var v;
  
  	x = new Float32Array([
  		1.0,  // 0
  		2.0,
  		2.0,  // 1
  		-7.0,
  		-2.0, // 2
  		3.0,
  		4.0,  // 3
  		2.0
  	]);
  
  	N = floor( x.length / 2 );
  	v = sdssumpw( N, x, 2, 0 );
  
  	t.strictEqual( v, 5.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports a negative `stride` parameter', opts, function test( t ) {
  	var N;
  	var x;
  	var v;
  	var i;
  
  	x = new Float32Array([
  		1.0,  // 3
  		2.0,
  		2.0,  // 2
  		-7.0,
  		-2.0, // 1
  		3.0,
  		4.0,  // 0
  		2.0
  	]);
  
  	N = floor( x.length / 2 );
  	v = sdssumpw( N, x, -2, 6 );
  
  	t.strictEqual( v, 5.0, 'returns expected value' );
  
  	x = new Float32Array( 1e3 );
  	for ( i = 0; i < 1e3; i++ ) {
  		x[ i ] = i + 1;
  	}
  	v = sdssumpw( x.length, x, -1, x.length-1 );
  	t.strictEqual( v, 500500.0, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'if provided a `stride` parameter equal to `0`, the function returns the first indexed element', opts, function test( t ) {
  	var x;
  	var v;
  
  	x = new Float32Array( [ 1.0, -2.0, -4.0, 5.0, 3.0 ] );
  
  	v = sdssumpw( x.length, x, 0, 0 );
  	t.strictEqual( v, 1.0, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'the function supports an `offset` parameter', opts, function test( t ) {
  	var N;
  	var x;
  	var v;
  
  	x = new Float32Array([
  		2.0,
  		1.0,  // 0
  		2.0,
  		-2.0, // 1
  		-2.0,
  		2.0,  // 2
  		3.0,
  		4.0   // 3
  	]);
  	N = floor( x.length / 2 );
  
  	v = sdssumpw( N, x, 2, 1 );
  	t.strictEqual( v, 5.0, 'returns expected value' );
  
  	t.end();
  });
  