text: /**
  * @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 isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
  var isnan = require( '@stdlib/math/base/assert/is-nan' );
  var PINF = require( '@stdlib/constants/math/float64-pinf' );
  var NINF = require( '@stdlib/constants/math/float64-ninf' );
  var PI = require( '@stdlib/constants/math/float64-pi' );
  var abs = require( './../lib' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.equal( typeof abs, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function computes the absolute value of a number', function test( t ) {
  	t.equal( abs( -2.0 ), 2.0, 'negative number' );
  	t.equal( abs( 3.0 ), 3.0, 'positive number' );
  	t.equal( abs( 0.0 ), 0.0, 'zero' );
  	t.equal( abs( -PI ), PI, 'pi' );
  	t.end();
  });
  
  tape( 'the function computes the absolute value of negative zero', function test( t ) {
  	t.equal( isPositiveZero( abs( -0.0 ) ), true, 'returns positive zero' );
  	t.end();
  });
  
  tape( 'the function computes the absolute value of infinity', function test( t ) {
  	t.equal( abs( PINF ), PINF, 'returns +infinity' );
  	t.equal( abs( NINF ), PINF, 'returns +infinity' );
  	t.end();
  });
  
  tape( 'if provided `NaN`, the function returns `NaN`', function test( t ) {
  	var v = abs( NaN );
  	t.equal( isnan( v ), true, 'returns NaN' );
  	t.end();
  });
  