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/**
* @license Apache-2.0
*
* Copyright (c) 2018 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 isUint32Array = require( '@stdlib/assert/is-uint32array' );
var triangular = require( './../lib' );
// TESTS //
tape( 'main export is a function', function test( t ) {
t.ok( true, __filename );
t.equal( typeof triangular, 'function', 'main export is a function' );
t.end();
});
tape( 'attached to the main export is a method to generate pseudorandom number generators', function test( t ) {
t.equal( typeof triangular.factory, 'function', 'has method' );
t.end();
});
tape( 'attached to the main export is a method to serialize a pseudorandom number generator as JSON', function test( t ) {
t.equal( typeof triangular.toJSON, 'function', 'has method' );
t.end();
});
tape( 'attached to the main export is the generator name', function test( t ) {
t.equal( triangular.NAME, 'triangular', 'has property' );
t.end();
});
tape( 'attached to the main export is the underlying PRNG', function test( t ) {
t.equal( typeof triangular.PRNG, 'function', 'has property' );
t.end();
});
tape( 'attached to the main export is the generator seed', function test( t ) {
t.equal( isUint32Array( triangular.seed ), true, 'has property' );
t.end();
});
tape( 'attached to the main export is the generator seed length', function test( t ) {
t.equal( typeof triangular.seedLength, 'number', 'has property' );
t.end();
});
tape( 'attached to the main export is the generator state', function test( t ) {
t.equal( isUint32Array( triangular.state ), true, 'has property' );
t.end();
});
tape( 'attached to the main export is the generator state length', function test( t ) {
t.equal( typeof triangular.stateLength, 'number', 'has property' );
t.end();
});
tape( 'attached to the main export is the generator state size', function test( t ) {
t.equal( typeof triangular.byteLength, 'number', 'has property' );
t.end();
});
tape( 'the function returns pseudorandom numbers', function test( t ) {
var r;
var a;
var b;
var c;
var i;
a = 200.0;
b = 499.974;
c = 211.33;
for ( i = 0; i < 1e2; i++ ) {
r = triangular( a, b, c );
t.equal( typeof r, 'number', 'returns a number' );
t.equal( r >= a && r <= b, true, 'within support: '+r );
}
t.end();
});
tape( 'the function supports setting the generator state', function test( t ) {
var state;
var arr;
var i;
// Move to a future state...
for ( i = 0; i < 100; i++ ) {
triangular( 0.0, 1.0, 0.5 );
}
// Capture the current state:
state = triangular.state;
// Move to a future state...
arr = [];
for ( i = 0; i < 100; i++ ) {
arr.push( triangular( 0.0, 1.0, 0.5 ) );
}
// Set the state:
triangular.state = state;
// Replay previously generated values...
for ( i = 0; i < 100; i++ ) {
t.equal( triangular( 0.0, 1.0, 0.5 ), arr[ i ], 'returns expected value. i: '+i+'.' );
}
t.end();
});
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