test.native.js

/**
* @license Apache-2.0
*
* Copyright (c) 2024 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 isnan = require( '@stdlib/math/base/assert/is-nan' );
var PINF = require( '@stdlib/constants/float64/pinf' );
var NINF = require( '@stdlib/constants/float64/ninf' );
var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
var tryRequire = require( '@stdlib/utils/try-require' );


// VARIABLES //

var cos = tryRequire( resolve( __dirname, './../lib/native.js' ) );
var opts = {
	'skip': ( cos instanceof Error )
};


// FIXTURES //

var mediumNegative = require( './fixtures/julia/medium_negative.json' );
var mediumPositive = require( './fixtures/julia/medium_positive.json' );
var largeNegative = require( './fixtures/julia/large_negative.json' );
var largePositive = require( './fixtures/julia/large_positive.json' );
var hugeNegative = require( './fixtures/julia/huge_negative.json' );
var hugePositive = require( './fixtures/julia/huge_positive.json' );


// TESTS //

tape( 'main export is a function', opts, function test( t ) {
	t.ok( true, __filename );
	t.strictEqual( typeof cos, 'function', 'main export is a function' );
	t.end();
});

tape( 'the function computes the cosine (medium negative values)', opts, function test( t ) {
	var expected;
	var x;
	var y;
	var i;

	x = mediumNegative.x;
	expected = mediumNegative.expected;

	for ( i = 0; i < x.length; i++ ) {
		y = cos( x[ i ] );
		t.strictEqual( isAlmostSameValue( y, expected[ i ], 1 ), true, 'returns expected value' );
	}

	t.end();
});

tape( 'the function computes the cosine (positive medium values)', opts, function test( t ) {
	var expected;
	var x;
	var y;
	var i;

	x = mediumPositive.x;
	expected = mediumPositive.expected;

	for ( i = 0; i < x.length; i++ ) {
		y = cos( x[ i ] );
		t.strictEqual( isAlmostSameValue( y, expected[ i ], 1 ), true, 'returns expected value' );
	}

	t.end();
});

tape( 'the function computes the cosine (large negative values)', opts, function test( t ) {
	var expected;
	var x;
	var y;
	var i;

	x = largeNegative.x;
	expected = largeNegative.expected;

	for ( i = 0; i < x.length; i++ ) {
		y = cos( x[ i ] );
		t.strictEqual( isAlmostSameValue( y, expected[ i ], 1 ), true, 'returns expected value' );
	}

	t.end();
});

tape( 'the function computes the cosine (large positive values)', opts, function test( t ) {
	var expected;
	var x;
	var y;
	var i;

	x = largePositive.x;
	expected = largePositive.expected;

	for ( i = 0; i < x.length; i++ ) {
		y = cos( x[ i ] );
		t.strictEqual( isAlmostSameValue( y, expected[ i ], 1 ), true, 'returns expected value' );
	}

	t.end();
});

tape( 'the function computes the cosine (huge negative values)', opts, function test( t ) {
	var expected;
	var x;
	var y;
	var i;

	x = hugeNegative.x;
	expected = hugeNegative.expected;

	for ( i = 0; i < x.length; i++ ) {
		y = cos( x[ i ] );
		t.strictEqual( isAlmostSameValue( y, expected[ i ], 1 ), true, 'returns expected value' );
	}
	t.end();
});

tape( 'the function computes the cosine (huge positive values)', opts, function test( t ) {
	var expected;
	var x;
	var y;
	var i;

	x = hugePositive.x;
	expected = hugePositive.expected;

	for ( i = 0; i < x.length; i++ ) {
		y = cos( x[ i ] );
		t.strictEqual( isAlmostSameValue( y, expected[ i ], 1 ), true, 'returns expected value' );
	}

	t.end();
});

tape( 'the function returns `NaN` if provided a `NaN`', opts, function test( t ) {
	var v = cos( NaN );
	t.strictEqual( isnan( v ), true, 'returns expected value' );
	t.end();
});

tape( 'the function returns `NaN` if provided a `+infinity`', opts, function test( t ) {
	var v = cos( PINF );
	t.strictEqual( isnan( v ), true, 'returns expected value' );
	t.end();
});

tape( 'the function returns `NaN` if provided a `-infinity`', opts, function test( t ) {
	var v = cos( NINF );
	t.strictEqual( isnan( v ), true, 'returns expected value' );
	t.end();
});

tape( 'the function returns `1` if provided `+-0`', opts, function test( t ) {
	var v;

	v = cos( -0.0 );
	t.strictEqual( v, 1.0, 'returns expected value' );

	v = cos( +0.0 );
	t.strictEqual( v, 1.0, 'returns expected value' );

	t.end();
});