test.js

/**
* @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 pow = require( '@stdlib/math/base/special/pow' );
var ln = require( '@stdlib/math/base/special/ln' );
var FLOAT16_MAX = require( '@stdlib/constants/float16/max' );
var float64ToFloat16 = require( '@stdlib/number/float64/base/to-float16' );
var FLOAT16_MAX_LN = require( './../lib' );


// TESTS //

tape( 'main export is a number', function test( t ) {
	t.ok( true, __filename );
	t.strictEqual( typeof FLOAT16_MAX_LN, 'number', 'main export is a number' );
	t.end();
});

tape( 'export is a single-precision floating-point number equal to the natural logarithm of the max single-precision floating-point number', function test( t ) {
	t.strictEqual( FLOAT16_MAX_LN, float64ToFloat16( ln( pow( 2, 15 ) * ( 2 - pow( 2, -10 ) ) ) ), 'returns expected value' );
	t.strictEqual( FLOAT16_MAX_LN, float64ToFloat16( ln( FLOAT16_MAX ) ), 'returns expected value' );
	t.end();
});