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 tape = require( 'tape' );
  var Float64Array = require( '@stdlib/array-float64' );
  var gdot = require( './../lib/ndarray.js' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.strictEqual( typeof gdot, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function has an arity of 7', function test( t ) {
  	t.strictEqual( gdot.length, 7, 'has expected arity' );
  	t.end();
  });
  
  tape( 'the function calculates the dot product of arrays `x` and `y`', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [ 4.0, 2.0, -3.0, 5.0, -1.0, 2.0, -5.0, 6.0 ];
  	y = [ 2.0, 6.0, -1.0, -4.0, 8.0, 8.0, 2.0, -3.0 ];
  
  	dot = gdot( x.length, x, 1, 0, y, 1, 0 );
  	t.strictEqual( dot, -17.0, 'returns expected value' );
  
  	// Short datasets:
  	x = [ 3.0, -4.0, 1.0 ];
  	y = [ 1.0, -2.0, 3.0 ];
  
  	dot = gdot( x.length, x, 1, 0, y, 1, 0 );
  	t.strictEqual( dot, 14.0, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `0`', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [ 3.0, -4.0, 1.0 ];
  	y = [ 1.0, -2.0, 3.0 ];
  
  	dot = gdot( 0, x, 1, 0, y, 1, 0 );
  	t.strictEqual( dot, 0.0, 'returns expected value' );
  
  	dot = gdot( -4, x, 1, 0, y, 1, 0 );
  	t.strictEqual( dot, 0.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports an `x` stride', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [
  		2.0,  // 0
  		-3.0,
  		-5.0, // 1
  		7.0,
  		6.0   // 2
  	];
  	y = [
  		8.0,  // 0
  		2.0,  // 1
  		-3.0, // 2
  		3.0,
  		-4.0,
  		1.0
  	];
  
  	dot = gdot( 3, x, 2, 0, y, 1, 0 );
  	t.strictEqual( dot, -12.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports an `x` offset', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [
  		1.0,
  		2.0, // 0
  		3.0,
  		4.0, // 1
  		5.0,
  		6.0  // 2
  	];
  	y = [
  		6.0,  // 0
  		7.0,  // 1
  		8.0,  // 2
  		9.0,
  		10.0,
  		11.0
  	];
  
  	dot = gdot( 3, x, 2, 1, y, 1, 0 );
  	t.strictEqual( dot, 88.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports a `y` stride', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [
  		2.0,  // 0
  		-3.0, // 1
  		-5.0, // 2
  		7.0,
  		6.0
  	];
  	y = [
  		8.0,  // 0
  		2.0,
  		-3.0, // 1
  		3.0,
  		-4.0, // 2
  		1.0
  	];
  
  	dot = gdot( 3, x, 1, 0, y, 2, 0 );
  	t.strictEqual( dot, 45.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports a `y` offset', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [
  		1.0, // 0
  		2.0,
  		3.0, // 1
  		4.0,
  		5.0, // 2
  		6.0
  	];
  	y = [
  		6.0,
  		7.0,
  		8.0,
  		9.0,  // 0
  		10.0, // 1
  		11.0  // 2
  	];
  
  	dot = gdot( 3, x, 2, 0, y, 1, 3 );
  	t.strictEqual( dot, 94.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports negative strides', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [
  		1.0, // 2
  		2.0,
  		3.0, // 1
  		4.0,
  		5.0  // 0
  	];
  	y = [
  		6.0, // 2
  		7.0, // 1
  		8.0, // 0
  		9.0,
  		10.0
  	];
  
  	dot = gdot( 3, x, -2, x.length-1, y, -1, 2 );
  	t.strictEqual( dot, 67.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports complex access patterns', function test( t ) {
  	var dot;
  	var x;
  	var y;
  
  	x = [
  		1.0, // 0
  		2.0,
  		3.0, // 1
  		4.0,
  		5.0  // 2
  	];
  	y = [
  		6.0,
  		7.0,   // 2
  		8.0,   // 1
  		9.0,   // 0
  		10.0
  	];
  
  	dot = gdot( 3, x, 2, 0, y, -1, y.length-2 );
  	t.strictEqual( dot, 68.0, 'returns expected value' );
  	t.end();
  });
  
  tape( 'if both strides are equal to `1`, the function efficiently calculates the dot product', function test( t ) {
  	var expected;
  	var dot;
  	var x;
  	var y;
  	var i;
  
  	expected = 0.0;
  	x = new Float64Array( 100 );
  	y = new Float64Array( x.length );
  	for ( i = 0; i < x.length; i++ ) {
  		x[ i ] = i;
  		y[ i ] = x.length - i;
  		expected += x[ i ] * y[ i ];
  	}
  
  	dot = gdot( x.length, x, 1, 0, y, 1, 0 );
  
  	t.strictEqual( dot, expected, 'returns expected value' );
  
  	expected = 0.0;
  	x = new Float64Array( 240 );
  	y = new Float64Array( x.length );
  	for ( i = 0; i < x.length; i++ ) {
  		x[ i ] = i;
  		y[ i ] = x.length - i;
  		expected += x[ i ] * y[ i ];
  	}
  
  	dot = gdot( x.length, x, 1, 0, y, 1, 0 );
  
  	t.strictEqual( dot, expected, 'returns expected value' );
  	t.end();
  });
  