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test.native.js
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106 lines (88 loc) · 3.34 KB
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/**
* @license Apache-2.0
*
* Copyright (c) 2022 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 pow = require( '@stdlib/math-base-special-pow' );
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var PINF = require( '@stdlib/constants-float32-pinf' );
var NINF = require( '@stdlib/constants-float32-ninf' );
var isnan = require( '@stdlib/math-base-assert-is-nanf' );
var FLOAT32_SMALLEST_NORMAL = require( '@stdlib/constants-float32-smallest-normal' );
var FLOAT32_SMALLEST_SUBNORMAL = require( '@stdlib/constants-float32-smallest-subnormal' ); // eslint-disable-line id-length
var toFloat32 = require( '@stdlib/number-float64-base-to-float32' );
var tryRequire = require( '@stdlib/utils-try-require' );
// VARIABLES //
var normalize = tryRequire( resolve( __dirname, './../lib/native.js' ) );
var opts = {
'skip': ( normalize instanceof Error )
};
// TESTS //
tape( 'main export is a function', opts, function test( t ) {
t.ok( true, __filename );
t.strictEqual( typeof normalize, 'function', 'main export is a function' );
t.end();
});
tape( 'the function normalizes a denormalized number, returning a normal number and an exponent', opts, function test( t ) {
var frac;
var exp;
var x1;
var x;
var v;
var i;
// Smallest denormalized number:
v = normalize( FLOAT32_SMALLEST_SUBNORMAL );
t.ok( v[ 0 ] >= FLOAT32_SMALLEST_NORMAL, 'returns a normal number' );
t.strictEqual( v[ 0 ]*pow( 2.0, v[ 1 ] ), FLOAT32_SMALLEST_SUBNORMAL, 'x = y * 2^exp' );
// Other subnormals...
for ( i = 0; i < 1000; i++ ) {
frac = 0.26 + (randu()*10.0); // 0.26 prevents underflow
exp = -38 - round( randu()*6.0 );
x = frac * pow( 10.0, exp );
x = toFloat32( x );
v = normalize( x );
t.ok( v[ 0 ] >= FLOAT32_SMALLEST_NORMAL, 'returns a normal number ' + v[0] );
x1 = v[ 0 ] * pow( 2.0, v[ 1 ] );
x1 = toFloat32( x1 );
t.strictEqual( x1, x, 'y*2^exp=x. y='+v[0]+', exp='+v[1]+', x='+x );
}
t.end();
});
tape( 'the function returns `[0,0]` if provided a `0`', opts, function test( t ) {
var val = normalize( 0.0 );
t.deepEqual( val, [0.0, 0], 'returns [0,0]' );
t.end();
});
tape( 'the function returns `[+inf,0]` if provided a `+infinity`', opts, function test( t ) {
var val = normalize( PINF );
t.deepEqual( val, [PINF, 0], 'returns [+inf,0]' );
t.end();
});
tape( 'the function returns `[-inf,0]` if provided a `-infinity`', opts, function test( t ) {
var val = normalize( NINF );
t.deepEqual( val, [NINF, 0], 'returns [-inf,0]' );
t.end();
});
tape( 'the function returns `[NaN,0]` if provided a `NaN`', opts, function test( t ) {
var val = normalize( NaN );
t.strictEqual( isnan( val[0] ), true, 'first element is NaN' );
t.strictEqual( val[1], 0, 'second element is 0' );
t.end();
});